Added license information!

26 files changed, 1207 insertions, 84 deletions

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+										GNU GENERAL PUBLIC LICENSE
+											 Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+														Preamble
+
+	The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+	The licenses for most software and other practical works are designed
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+your programs, too.
+
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+	16. Limitation of Liability.
+
+	IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+	17. Interpretation of Sections 15 and 16.
+
+	If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+										 END OF TERMS AND CONDITIONS
+
+						How to Apply These Terms to Your New Programs
+
+	If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+	To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+		<one line to give the program's name and a brief idea of what it does.>
+		Copyright (C) <year>  <name of author>
+
+		This program is free software: you can redistribute it and/or modify
+		it under the terms of the GNU General Public License as published by
+		the Free Software Foundation, either version 3 of the License, or
+		(at your option) any later version.
+
+		This program is distributed in the hope that it will be useful,
+		but WITHOUT ANY WARRANTY; without even the implied warranty of
+		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+		GNU General Public License for more details.
+
+		You should have received a copy of the GNU General Public License
+		along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+	If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+		<program>  Copyright (C) <year>  <name of author>
+		This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+		This is free software, and you are welcome to redistribute it
+		under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+	You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+	The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
index 2b0b6a2..c488aa7 100644
--- a/Makefile
+++ b/Makefile
@@ -9,11 +9,9 @@ OBJS=$(SRCS:.c=.o)
 BUILDROOT_DIR=buildroot-2020.11.1
 
 ifeq ($(PLATFORM), native)
-	SIZE=size
 	STRIP=strip
 else
 	STRIP=$(BUILDROOT_DIR)/output/host/bin/arm-linux-strip
-	SIZE=$(BUILDROOT_DIR)/output/host/bin/arm-linux-size
 	CC=$(BUILDROOT_DIR)/output/host/bin/arm-linux-cc
 endif
 
@@ -22,8 +20,7 @@ endif
 
 ctaklm: src/ctaklm.o $(OBJS)
 	$(CC) $(CFLAGS) src/ctaklm.o $(OBJS) -o ctaklm
-#	$(STRIP) ctaklm
-	$(SIZE) ctaklm
+	$(STRIP) ctaklm
 
 pptdb: src/pptdb.o $(OBJS)
 	$(CC) $(CFLAGS) src/pptdb.o $(OBJS) -o pptdb
@@ -31,7 +28,6 @@ pptdb: src/pptdb.o $(OBJS)
 ct1986: src/ct1986.o $(OBJS)
 	$(CC) $(CFLAGS) src/ct1986.o $(OBJS) -o ct1986
 	$(STRIP) ct1986
-	$(SIZE) ct1986
 
 all: ctaklm ct1986
 ifneq ($(PLATFORM), native)
diff --git a/do_buildroot.sh b/do_buildroot.sh
index 40c3f0b..00e9f54 100755
--- a/do_buildroot.sh
+++ b/do_buildroot.sh
@@ -1,5 +1,20 @@
 #!/bin/sh
 
+# This file is part of ct1986
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+
 BR="$1"
 
 board="$BR/board/raspberrypi0/"
diff --git a/extract.sh b/extract.sh
index 9325b47..fb6f267 100755
--- a/extract.sh
+++ b/extract.sh
@@ -5,7 +5,6 @@ db_file=games_anon.db
 chosen_players="fwwwwibib archvenison NohatCoder nqeron ManaT
 SultanPepper orfane rabbitboy84 applemonkeyman Reid Tayacan Breeze
 AaaarghBot"
-# chosen_players=""
 
 query() {
 		query="(size == $1) and (result != '1-0') and (result != '0-1') and (result != '0-0') and (result != '1/2-1/2')"
diff --git a/include/actions.c b/include/actions.c
index 5085330..800a2d4 100644
--- a/include/actions.c
+++ b/include/actions.c
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "actions.h"
 
 // ===================================================================
@@ -67,6 +84,7 @@ void action_list_init(void) {
 
 action_list_t *action_list_generate(void) {
 	action_list_t *list = malloc(sizeof(struct action_list_s));
+
 	// TODO: trap errno
 	list->length = 0;
 	list->head = NULL;
@@ -129,16 +147,22 @@ action_list_t *action_list_generate(void) {
 					 * For each direction, generate all possible ordered integer
 					 * partitions of 1 ≤ num ≤ count whose number of summands is
 					 * exactly 1 ≤ summands ≤ min(end_stops[dir], num) -- we
-					 * write summands as steps
+					 * write summands as steps.
+					 *
+					 * We exploit the `gaps' bijection here and elsewhere
+					 * between ordered {integer partitions of n with s summands}
+					 * and {binary strings of length n-1 with s-1 set bits}.
 					 */
 					for (enum MOVE_DIRECTION dir=M_UP; dir<=M_RIGHT; dir++) {
 						for (uint8_t num = 1; num <= count; num++) {
 							for (uint8_t steps = 1;
 									 steps <= end_stops[dir] && steps <= num;
 									 steps++) {
-								// TODO: Generalise to board_size!
-								uint8_t gaps = 0x07 >> (board_size-steps-1);
-								// 0b0000[0111] because 4-1=3 and 5-1=4
+								uint8_t gaps =
+									((1<<(board_size - 2)) - 1) >> (board_size-steps-1);
+								// For 5x5 this givess 0b0000[0XXX] where steps-1 of
+								// those X's are 1s (starting with LSB) because 4-1=3
+								// and 5-1=4
 								do  {
 									/*
 									 * We skip the partition if it calls for multiple
@@ -214,9 +238,12 @@ void action_take(const action_t action) {
 			}
 		}
 	} else {
-		 // not interested in whether we crushed, it will work out by
-		 // anyway because we overwrite the top stone type. See (*) later
-		 // for when we do need to know.
+		/*
+		 * See the discussion around line 135 for an explanation of the
+		 * encoding. Here we are not interested in whether we crushed, it
+		 * will work out by anyway because we overwrite the top stone
+		 * type. See (*) later for when we do need to know.
+		 */
 		const uint8_t gaps = A_GET_DATA0(action) & 0x7F,
 			num = A_GET_DATA1(action) & 0x0F, // unpack
 			dir = A_GET_DATA1(action) >> 4;
diff --git a/include/actions.h b/include/actions.h
index ced0315..a1c90cc 100644
--- a/include/actions.h
+++ b/include/actions.h
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #ifndef ACTIONS_H
 #define ACTIONS_H
 
@@ -6,6 +23,10 @@
 
 #include <tak.h>
 
+// ===================================================================
+// Types
+// ===================================================================
+
 enum A_TYPE { A_PLACE, A_MOVE };
 
 typedef uint32_t action_t;
@@ -33,11 +54,20 @@ typedef struct action_list_s {
 	uint32_t length;
 } action_list_t;
 
+// ===================================================================
+// Variables
+// ===================================================================
+
 extern int8_t move_deltas[4];
 
+// ===================================================================
+// Methods
+// ===================================================================
+
 void action_list_init(void);
 void action_list_free(action_list_t *list);
 action_list_t *action_list_generate(void);
+
 int action_move_to_front(const action_t action, action_list_t *list);
 
 void action_take(const action_t action);
diff --git a/include/cnn1986.c b/include/cnn1986.c
index ada1766..d4f6ad6 100644
--- a/include/cnn1986.c
+++ b/include/cnn1986.c
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "cnn1986.h"
 #include "weights.h"
 
diff --git a/include/cnn1986.h b/include/cnn1986.h
index c04a04e..fe3817a 100644
--- a/include/cnn1986.h
+++ b/include/cnn1986.h
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <tak.h>
 
 float cnn1986_evaluate_black_win(void);
diff --git a/include/lcdlib.c b/include/lcdlib.c
index 0933b2c..c956d5c 100644
--- a/include/lcdlib.c
+++ b/include/lcdlib.c
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "lcdlib.h"
 
 static char previous_lines[LCD_HEIGHT][LCD_WIDTH+1];
diff --git a/include/lcdlib.h b/include/lcdlib.h
index fd28a0e..192b3a4 100644
--- a/include/lcdlib.h
+++ b/include/lcdlib.h
@@ -1,19 +1,43 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <stdlib.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 
+// ===================================================================
+// Types
+// ===================================================================
+
 #define LCD_WIDTH  16
 #define LCD_HEIGHT 2
 
 enum LCD_WRITE_MODE { L_OVERWRITE, L_SCROLL };
 
+// ===================================================================
+// Methods
+// ===================================================================
+
 int lcd_begin(void);
 void lcd_end(void);
 void lcd_clear(void);
 
-void lcd_put_line(const enum LCD_WRITE_MODE mode,
-									const char *line);
+void lcd_put_line(const enum LCD_WRITE_MODE mode, const char *line);
 
 void lcd_printf_line(const enum LCD_WRITE_MODE mode,
 										 const char *format, ...);
diff --git a/include/negamax.c b/include/negamax.c
index 3db5867..cdcfcf9 100644
--- a/include/negamax.c
+++ b/include/negamax.c
@@ -1,7 +1,24 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "negamax.h"
 
 // ===================================================================
-// Globals
+// Variables
 // ===================================================================
 
 const float infty = 3.0;
@@ -9,52 +26,52 @@ char negamax_ptn[9];
 uint8_t negamax_search_depth = 3;
 
 // ===================================================================
-// Helpers
+// Helper declarations
 // ===================================================================
 
-static float
-negamax(const uint8_t cur_depth, float alpha, float beta,
+static float negamax(const uint8_t cur_depth, float alpha, float beta,
 				const float colour);
 
 // ===================================================================
-// α-β negamax using the cnn1986 evaluation function and transposition
-// tables using Zobrist hasing and a treap
+// Exported functions
 // ===================================================================
 
-void
-negamax_init(const uint8_t new_board_size) {
+void negamax_init(const uint8_t new_board_size) {
 	board_size = new_board_size;
 	action_list_init();
 	zobrist_init();
 	tt_init();
 }
 
-void
-negamax_free(void) {
+void negamax_free(void) {
 	zobrist_free();
 }
 
-float
-negamax_generate(void) {
+float negamax_generate(void) {
 	// We need to start with something outside of [-∞,∞] because those
 	// values are wins
 	const float safe_infty = infty + 1;
 
 	tt_init();
-	float result = negamax(negamax_search_depth,
-												 -safe_infty, safe_infty,
-												 (ply & 1) ? +1.0 : -1.0);
+	float result =
+		negamax(negamax_search_depth,
+						-safe_infty, safe_infty,
+						(ply & 1) ? +1.0 : -1.0);
 	tt_free();
 
 	return result;
 }
 
+// ===================================================================
+// α-β negamax using the cnn1986 evaluation function and transposition
+// tables using Zobrist hasing and a chaining hash table
+// ===================================================================
+
 static enum TT_FLAG flag;
 static enum WIN_TYPE w;
 
-static float
-negamax(const uint8_t cur_depth, float alpha, float beta,
-				const float colour) {
+static float negamax(const uint8_t cur_depth, float alpha, float beta,
+										 const float colour) {
 
 	uint64_t hash = zobrist_compute();
 	tt_entry_t *entry = tt_seek(hash);
diff --git a/include/negamax.h b/include/negamax.h
index b41871e..77461b8 100644
--- a/include/negamax.h
+++ b/include/negamax.h
@@ -1,30 +1,52 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <stdint.h>
 #include <math.h>
 
 #include <tak.h>
-
 #include <actions.h>
 #include <cnn1986.h>
 #include <tt_llcht.h>
-#include <xorshift64.h>
 #include <zobrist.h>
 
+// ===================================================================
+// Variables
+// ===================================================================
+
 extern const float infty;
 extern char negamax_ptn[9];
 extern uint8_t negamax_search_depth;
 
-extern inline void
-negamax_display_progress(const uint8_t, const uint32_t length);
+extern void negamax_display_progress(const uint8_t cur_depth,
+																		 const uint32_t length);
+
+// ===================================================================
+// Methods
+// ===================================================================
 
-void
-negamax_init(const uint8_t new_board_size);
+void negamax_init(const uint8_t new_board_size);
 
-void
-negamax_free(void);
+void negamax_free(void);
 
-// Do negamax to depth negamax_search_depth and return PTN of best move
-// in negamax_ptn, along with its value as the return. The
-// negamax_display_progress function is called on every new square at
-// the top level.
+/*
+ * Do α-β negamax with transposition tables and naïve move ordering to
+ * depth `negamax_search_depth' and store the PTN of best move in
+ * `negamax_ptn', and return its value. The `negamax_display_progress'
+ * function is called on every new square at the top level.
+ */
 float negamax_generate(void);
-extern uint8_t yes;
diff --git a/include/tak.c b/include/tak.c
index 6d07ea0..c9c761c 100644
--- a/include/tak.c
+++ b/include/tak.c
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "tak.h"
 
 // ===================================================================
diff --git a/include/tak.h b/include/tak.h
index 135e4eb..8b40430 100644
--- a/include/tak.h
+++ b/include/tak.h
@@ -1,14 +1,32 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #ifndef TAK_H
 #define TAK_H
 
 #include <stdint.h>
 
+// ===================================================================
+// Types
+// ===================================================================
+
 enum E_RESULT {ACT_OK, ACT_ILLEGAL, ACT_OVERFLOW,
 	PTN_VALID, PTN_INVALID, GAME_END };
 
-// -------------------------------------------------------------------
-// State management
-
 enum COLOUR         { C_WHITE, C_BLACK };
 enum STONE_VARIANT  { STONE_FLAT, STONE_STANDING, STONE_CAPSTONE };
 enum MOVE_DIRECTION { M_UP, M_DOWN, M_LEFT, M_RIGHT };
@@ -27,6 +45,10 @@ typedef uint16_t colour_stack_t;
 #define COUNT_AT(l)         (celldat[(l)] >> NUM_SHIFT)
 #define THE_COORDS(col,row) ((col)+(row)*board_size)
 
+// ===================================================================
+// Variables
+// ===================================================================
+
 extern enum WIN_TYPE won;
 extern uint8_t board_size;
 extern data_t celldat[36];
@@ -34,6 +56,13 @@ extern colour_stack_t colours[36];
 extern enum COLOUR current_colour;
 extern uint8_t white_count, black_count, ply;
 
+// ===================================================================
+// Methods
+// ===================================================================
+
+// -------------------------------------------------------------------
+// Game state
+
 void reset_state(const uint8_t new_board_size);
 void next_ply(void);
 
diff --git a/include/tt_llcht.c b/include/tt_llcht.c
index 9cbf647..b898b23 100644
--- a/include/tt_llcht.c
+++ b/include/tt_llcht.c
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "tt_llcht.h"
 
 // ===================================================================
@@ -11,10 +28,9 @@ static tt_entry_t *table[TT_LLCHT_SIZE+1];
 // Helper declarations
 // ===================================================================
 
-tt_entry_t *
-new_ll_node(const uint64_t key, const enum TT_FLAG flag,
-						const uint8_t depth, const float value,
-						const action_t action);
+tt_entry_t * new_ll_node(const uint64_t key, const enum TT_FLAG flag,
+												 const uint8_t depth, const float value,
+												 const action_t action);
 
 
 // ===================================================================
@@ -69,10 +85,9 @@ int tt_insert(const uint64_t key, const enum TT_FLAG flag,
 // Helper function implementations
 // ===================================================================
 
-tt_entry_t *
-new_ll_node(const uint64_t key, const enum TT_FLAG flag,
-						const uint8_t depth, const float value,
-						const action_t action) {
+tt_entry_t * new_ll_node(const uint64_t key, const enum TT_FLAG flag,
+												 const uint8_t depth, const float value,
+												 const action_t action) {
 	tt_entry_t *new = malloc(sizeof(struct tt_node_s));
 	// TODO: trap errno
 	new->key = key;
diff --git a/include/tt_llcht.h b/include/tt_llcht.h
index f9a7a78..90b4164 100644
--- a/include/tt_llcht.h
+++ b/include/tt_llcht.h
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #ifndef TT_LLCHT_H
 #define TT_LLCHT_H
 
@@ -22,7 +39,7 @@ typedef struct tt_node_s {
 } tt_entry_t;
 
 // ===================================================================
-// Globals
+// Variables
 // ===================================================================
 
 #define TT_LLCHT_SIZE ((uint32_t)((1<<19) - 1))
diff --git a/include/weights.c b/include/weights.c
index 905eb41..812a2eb 100644
--- a/include/weights.c
+++ b/include/weights.c
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "weights.h"
 
 const float conv2d_weights[KERN_NUM][KERN_SIZE][KERN_SIZE][KERN_CHAN] =
diff --git a/include/weights.h b/include/weights.h
index dd479e3..d6666e7 100644
--- a/include/weights.h
+++ b/include/weights.h
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #define KERN_SIZE  3
 #define KERN_CHAN  6
 #define KERN_NUM   12
diff --git a/include/xorshift64.c b/include/xorshift64.c
index 516218a..fd2fb6e 100644
--- a/include/xorshift64.c
+++ b/include/xorshift64.c
@@ -1,3 +1,20 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "xorshift64.h"
 
 uint64_t xors = (uint64_t)0xBF58476D1CE4E5B9;
diff --git a/include/xorshift64.h b/include/xorshift64.h
index 62a0a4e..4509772 100644
--- a/include/xorshift64.h
+++ b/include/xorshift64.h
@@ -1,8 +1,25 @@
-#include <stdint.h>
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
 
 #ifndef XORSHIFT_H
 #define XORSHIFT_H
 
+#include <stdint.h>
+
 extern uint64_t xors;
 
 #define XORSHIFT64 { \
diff --git a/include/zobrist.c b/include/zobrist.c
index feff5fa..21a99af 100644
--- a/include/zobrist.c
+++ b/include/zobrist.c
@@ -1,25 +1,38 @@
-#include "zobrist.h"
+/*
+	This file is part of ctak.
 
-// ===================================================================
-// Globals
-// ===================================================================
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
 
-static uint64_t *zobrist;
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "zobrist.h"
 
 // ===================================================================
-// Helpers
+// Variables
 // ===================================================================
 
+static uint64_t *zobrist;
 
 // ===================================================================
 // Exported method implementations
 // ===================================================================
 
-int
-zobrist_init(void) {
+int zobrist_init(void) {
 	if (zobrist != NULL) return EXIT_FAILURE;
 
 	zobrist = malloc(sizeof(uint64_t)*board_size*board_size*(15*2*3));
+	// TODO: trap errno
+
 	for (int k=0; k<board_size*board_size*(15*2*3); k++) {
 		XORSHIFT64;
 		zobrist[k] = RANDOM64;
@@ -28,16 +41,14 @@ zobrist_init(void) {
 	return EXIT_SUCCESS;
 }
 
-void
-zobrist_free(void) {
+void zobrist_free(void) {
 	if (zobrist != NULL) {
 		free(zobrist);
 		zobrist = NULL;
 	}
 }
 
-uint64_t
-zobrist_compute(void) {
+uint64_t zobrist_compute(void) {
 	uint64_t hash = 0;
 	for (uint8_t l=0; l<board_size*board_size; l++) {
 		colour_stack_t c = colours[l];
diff --git a/include/zobrist.h b/include/zobrist.h
index cfc2941..2b1a9dd 100644
--- a/include/zobrist.h
+++ b/include/zobrist.h
@@ -1,12 +1,26 @@
+/*
+	This file is part of ctak.
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful, but
+	WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+	General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Takwrap.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <xorshift64.h>
 #include <tak.h>
 #include <actions.h>
 
-void
-zobrist_free(void);
+void zobrist_free(void);
 
-int
-zobrist_init(void);
+int zobrist_init(void);
 
-uint64_t
-zobrist_compute(void);
+uint64_t zobrist_compute(void);
diff --git a/src/ct1986.c b/src/ct1986.c
index 213f3ff..0872ca7 100644
--- a/src/ct1986.c
+++ b/src/ct1986.c
@@ -1,3 +1,23 @@
+/*
+	ct1986, an interface to the ctak library designed to be embedded on
+	a Raspberry Pi Zero
+
+	Copyright (C) 2021, tslil clingman
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <stdlib.h>
 #include <string.h>
 
@@ -137,11 +157,18 @@ input_is_not_turn(const char *line) {
 	return EXIT_SUCCESS;
 }
 
-int
-main(int argc, char **argv) {
+const char* license = "ct1986, an interface to the ctak library designed to be embedded on a Raspberry Pi Zero\n\
+\n\
+Copyright (C) 2021, tslil clingman\n\
+\n\
+This program comes with ABSOLUTELY NO WARRANTY; and is made available under the terms of the GNU GPL v3 license. This is free software, and you are welcome to redistribute it under certain conditions; see COPYING for details.\n";
+
+int main(int argc, char **argv) {
 	(void)(argc);
 	(void)(argv);
 
+	puts(license);
+
 	if (lcd_begin() != EXIT_SUCCESS)
 		return EXIT_FAILURE;
 
diff --git a/src/ctaklm.c b/src/ctaklm.c
index e0022d1..4ef02be 100644
--- a/src/ctaklm.c
+++ b/src/ctaklm.c
@@ -1,3 +1,22 @@
+/*
+	ctaklm, a line mode interface to the ctak library
+
+	Copyright (C) 2021, tslil clingman
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -409,11 +428,18 @@ info, load, log, new, play (b|w), self-play, square <col><row>, <PTN>.");
 	return EXIT_SUCCESS;
 }
 
-int
-main(int argc, char **argv) {
+const char* license = "ctaklm, a line mode interface to the ctak library\n\
+\n\
+Copyright (C) 2021, tslil clingman\n\
+\n\
+This program comes with ABSOLUTELY NO WARRANTY; and is made available under the terms of the GNU GPL v3 license. This is free software, and you are welcome to redistribute it under certain conditions; see COPYING for details.\n";
+
+int main(int argc, char **argv) {
 	(void)(argc);
 	(void)(argv);
 
+	puts(license);
+
 	negamax_search_depth = 3;
 	new_game(5);
 	negamax_init(5);
diff --git a/src/pptdb.c b/src/pptdb.c
index 0c8673d..b5bdfa4 100644
--- a/src/pptdb.c
+++ b/src/pptdb.c
@@ -1,3 +1,23 @@
+/*
+	pptdb, generate neural network training data from a playtak.com
+	database dump
+
+	Copyright (C) 2021, tslil clingman
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -113,7 +133,8 @@ parse_line(const char *pt, const ssize_t read) {
 				}
 			}
 		}
-		// Generate training data, not too early in the game
+		// Generate training data, not too early in the game, random
+		// orientation
 		if (generate && ply + 4 >= total_plies) {
 			int dx = (rand()&1)?-1:+1;
 			int dy = (rand()&1)?-1:+1;
@@ -127,8 +148,13 @@ parse_line(const char *pt, const ssize_t read) {
 	return ACT_OK;
 }
 
-int
-main(int argc, char **argv) {
+const char* license = "pptdb, generate neural network training data from a playtak.com database dump\n\
+\n\
+Copyright (C) 2021, tslil clingman\n\
+\n\
+This program comes with ABSOLUTELY NO WARRANTY; and is made available under the terms of the GNU GPL v3 license. This is free software, and you are welcome to redistribute it under certain conditions; see COPYING for details.\n";
+
+int main(int argc, char **argv) {
 	(void)(argc);
 
 	enum E_RESULT r;
diff --git a/src/train5.py b/src/train5.py
index 3683c1e..25b1aab 100644
--- a/src/train5.py
+++ b/src/train5.py
@@ -1,3 +1,21 @@
+# train5.py, train a small CNN to recognise winning Tak positions
+#
+# Copyright (C) 2021, tslil clingman
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
 # Loading data
 import pandas as pd
 import numpy as np