From 5ab3fe6db8ea7dff1310c792d66f2a906a5c19c5 Mon Sep 17 00:00:00 2001
From: Linmiao Xu <linmiao.xu@gmail.com>
Date: Tue, 28 May 2024 19:39:55 -0400
Subject: [PATCH] Simplify blending eval with nnue complexity

Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/66567377a86388d5e27dd89c
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 144000 W: 37443 L: 37338 D: 69219
Ptnml(0-2): 587, 17260, 36208, 17351, 594

Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/66567f29a86388d5e27dd924
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 112326 W: 28550 L: 28421 D: 55355
Ptnml(0-2): 66, 12732, 30434, 12869, 62

closes https://github.com/official-stockfish/Stockfish/pull/5305

bench 1554486
---
 src/evaluate.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 849b7bb6..666697dd 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -75,7 +75,7 @@ Value Eval::evaluate(const Eval::NNUE::Networks&    networks,
 
     // Blend optimism and eval with nnue complexity
     optimism += optimism * nnueComplexity / 470;
-    nnue -= nnue * (nnueComplexity * 5 / 3) / 32621;
+    nnue -= nnue * nnueComplexity / 20000;
 
     int material = 300 * pos.count<PAWN>() + 350 * pos.count<KNIGHT>() + 400 * pos.count<BISHOP>()
                  + 640 * pos.count<ROOK>() + 1200 * pos.count<QUEEN>();