From 7f85cfbfa237efc2c08308061c31325783eb7ff5 Mon Sep 17 00:00:00 2001
From: Dieter Dobbelaere <dieter.dobbelaere@gmail.com>
Date: Sun, 1 Feb 2026 19:48:25 +0100
Subject: [PATCH] Include threat weights in network hash calculation

closes https://github.com/official-stockfish/Stockfish/pull/6583

No functional change
---
 src/nnue/nnue_feature_transformer.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/nnue/nnue_feature_transformer.h b/src/nnue/nnue_feature_transformer.h
index f4cf348ab..5ee5eaac8 100644
--- a/src/nnue/nnue_feature_transformer.h
+++ b/src/nnue/nnue_feature_transformer.h
@@ -218,10 +218,19 @@ class FeatureTransformer {
 
     std::size_t get_content_hash() const {
         std::size_t h = 0;
+
         hash_combine(h, get_raw_data_hash(biases));
         hash_combine(h, get_raw_data_hash(weights));
         hash_combine(h, get_raw_data_hash(psqtWeights));
+
+        if constexpr (UseThreats)
+        {
+            hash_combine(h, get_raw_data_hash(threatWeights));
+            hash_combine(h, get_raw_data_hash(threatPsqtWeights));
+        }
+
         hash_combine(h, get_hash_value());
+
         return h;
     }