From 1c9e266ae25f7f6067806d139e5971ce8513d2f6 Mon Sep 17 00:00:00 2001
From: tslil <tslil@posteo.de>
Date: Tue, 8 Sep 2026 11:55:28 +0100
Subject: ~25% speedup in selfplay due to: incremental zobrist hashing, smarter
 road checking, re-using the input computed for the NN

---
 include/zobrist.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'include/zobrist.h')

diff --git a/include/zobrist.h b/include/zobrist.h
index 5fd5ace..27053a6 100644
--- a/include/zobrist.h
+++ b/include/zobrist.h
@@ -19,8 +19,14 @@
 #include <tak.h>
 #include <xorshift64.h>
 
+#define PLY_PARITY_MAGIC 0x9E3779B97F4A7C15ULL
+
 void zobrist_free(void);
 
 int zobrist_init(const uint8_t board_size);
 
+// hash for whole state
 uint64_t zobrist_compute(tak_state_p state);
+
+// hash contribution from a single board cell at location l
+uint64_t zobrist_cell(tak_state_p state, const uint8_t l);
-- 
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