From fac506bdf3f0ed46fd0823ff1ed592824f91aa5a Mon Sep 17 00:00:00 2001
From: sscg13 <iamdumbybear1@gmail.com>
Date: Sat, 31 Jan 2026 09:57:10 -0800
Subject: [PATCH] Update NNUE architecture to SFNNv11 and net
 nn-3dd094f3dfcf.nnue

Removes threat features of the form piece -> king, thus saving 13MB of net
space and approximately 0.8 threat feature updates per incremental accumulator
update.

Passed non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 33664 W: 8864 L: 8636 D: 16164
Ptnml(0-2): 136, 3926, 8501, 4112, 157
https://tests.stockfishchess.org/tests/view/6981dcda4776a4e6e7fef2ac

Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 46896 W: 12077 L: 11881 D: 22938
Ptnml(0-2): 41, 5118, 12924, 5334, 31
https://tests.stockfishchess.org/tests/view/69827c6beb87369ff4d0c7d5

closes https://github.com/official-stockfish/Stockfish/pull/6593

bench: 2668754
---
 src/evaluate.h                   |  2 +-
 src/nnue/features/full_threats.h | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/evaluate.h b/src/evaluate.h
index b4f54a381..226170e12 100644
--- a/src/evaluate.h
+++ b/src/evaluate.h
@@ -33,7 +33,7 @@ namespace Eval {
 // for the build process (profile-build and fishtest) to work. Do not change the
 // name of the macro or the location where this macro is defined, as it is used
 // in the Makefile/Fishtest.
-#define EvalFileDefaultNameBig "nn-c288c895ea92.nnue"
+#define EvalFileDefaultNameBig "nn-3dd094f3dfcf.nnue"
 #define EvalFileDefaultNameSmall "nn-37f18f62d772.nnue"
 
 namespace NNUE {
diff --git a/src/nnue/features/full_threats.h b/src/nnue/features/full_threats.h
index 5b2582954..a71368ad4 100644
--- a/src/nnue/features/full_threats.h
+++ b/src/nnue/features/full_threats.h
@@ -30,8 +30,8 @@ class Position;
 
 namespace Stockfish::Eval::NNUE::Features {
 
-static constexpr int numValidTargets[PIECE_NB] = {0, 6, 12, 10, 10, 12, 8, 0,
-                                                  0, 6, 12, 10, 10, 12, 8, 0};
+static constexpr int numValidTargets[PIECE_NB] = {0, 6, 10, 8, 8, 10, 8, 0,
+                                                  0, 6, 10, 8, 8, 10, 8, 0};
 
 class FullThreats {
    public:
@@ -42,7 +42,7 @@ class FullThreats {
     static constexpr std::uint32_t HashValue = 0x8f234cb8u;
 
     // Number of feature dimensions
-    static constexpr IndexType Dimensions = 79856;
+    static constexpr IndexType Dimensions = 66864;
 
     // clang-format off
     // Orient a square according to perspective (rotates by 180 for black)
@@ -59,10 +59,10 @@ class FullThreats {
 
     static constexpr int map[PIECE_TYPE_NB-2][PIECE_TYPE_NB-2] = {
       {0,  1, -1,  2, -1, -1},
-      {0,  1,  2,  3,  4,  5},
-      {0,  1,  2,  3, -1,  4},
-      {0,  1,  2,  3, -1,  4},
-      {0,  1,  2,  3,  4,  5},
+      {0,  1,  2,  3,  4, -1},
+      {0,  1,  2,  3, -1, -1},
+      {0,  1,  2,  3, -1, -1},
+      {0,  1,  2,  3,  4, -1},
       {0,  1,  2,  3, -1, -1}
     };
     // clang-format on