From 9739ed7a97c153c3223b608b24717edbf2dfd7bc Mon Sep 17 00:00:00 2001
From: FauziAkram <fauzi.dabat@hotmail.com>
Date: Sat, 23 Sep 2023 13:24:09 +0300
Subject: [PATCH] Simplify pawn count in evaluation

This simplifies the evaluation by removing the unnecessary pawn count term when
combining nnue and optimism values.

Passed STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 61472 W: 15748 L: 15554 D: 30170
Ptnml(0-2): 191, 7123, 15933, 7279, 210
https://tests.stockfishchess.org/tests/view/650c34cf7ca0d3f7bbf264ff

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 81264 W: 20657 L: 20500 D: 40107
Ptnml(0-2): 30, 8713, 22997, 8854, 38
https://tests.stockfishchess.org/tests/view/650cc30efb151d43ae6d5987

closes https://github.com/official-stockfish/Stockfish/pull/4800

Bench: 1530568
---
 src/evaluate.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 9ca0e456..208e3ed5 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -177,7 +177,7 @@ Value Eval::evaluate(const Position& pos) {
 
       int npm = pos.non_pawn_material() / 64;
       v = (  nnue     * (915 + npm + 9 * pos.count<PAWN>())
-           + optimism * (154 + npm +     pos.count<PAWN>())) / 1024;
+           + optimism * (154 + npm                       )) / 1024;
   }
 
   // Damp down the evaluation linearly when shuffling
-- 
2.39.2