fix tt issue for non-self-playHEADmain

A little subtle, but in non-self-play games sharing tt entries is incorrect. We must therefore key additionally on the evaulation function itself.

1 files changed, 6 insertions, 5 deletions

diff --git a/include/tt.h b/include/tt.h
index 60b9b66..5834860 100644
--- a/include/tt.h
+++ b/include/tt.h
@@ -19,7 +19,7 @@
 #define TT_H
 
 #include <stdint.h>
-
+#include <nn.h>
 #include <actions.h>
 
 // ===================================================================
@@ -35,6 +35,7 @@ enum TT_FLAG { TT_EXACT, TT_LOWERBOUND, TT_UPPERBOUND };
 typedef struct tt_node_s {
   uint16_t gen;
   uint64_t key;
+  nn_function eval;
   enum TT_FLAG flag;
   uint8_t depth;
   float value;
@@ -61,7 +62,7 @@ typedef struct tt_node_s {
 // entries are otherwise kept across plies on purpose (see negamax.c).
 int tt_init(void);
 
-tt_entry_t *tt_seek(const uint64_t key);
+tt_entry_t *tt_seek(const uint64_t key, const nn_function eval);
 
 // Store a search result for `key', returning the entry it was written to, or
 // NULL when the replacement policy keeps the current occupant instead.
@@ -73,8 +74,8 @@ tt_entry_t *tt_seek(const uint64_t key);
 //   - otherwise (empty slot, stale generation, or a different key): replace the
 //     occupant unless it is a deeper search of a different position, which is
 //     kept.
-tt_entry_t *tt_store(const uint64_t key, const enum TT_FLAG flag,
-                     const uint8_t depth, const float value,
-                     const action_t action);
+tt_entry_t *tt_store(const uint64_t key, const nn_function eval,
+                     const enum TT_FLAG flag, const uint8_t depth,
+                     const float value, const action_t action);
 
 #endif