From 2e2d2778fcae019f8cf53acedd5cb7b5a44696fb Mon Sep 17 00:00:00 2001
From: Nonlinear2 <131959792+Nonlinear2@users.noreply.github.com>
Date: Mon, 28 Jul 2025 09:07:29 +0200
Subject: [PATCH] increase futility value when capturing last moved piece

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 204320 W: 53059 L: 52500 D: 98761
Ptnml(0-2): 551, 23874, 52778, 24379, 578
https://tests.stockfishchess.org/tests/view/688618ae966ed85face24976

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 138582 W: 35748 L: 35225 D: 67609
Ptnml(0-2): 62, 14874, 38900, 15389, 66
https://tests.stockfishchess.org/tests/view/68862717966ed85face249f2

closes https://github.com/official-stockfish/Stockfish/pull/6190

Bench: 2894413
---
 src/search.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index 24ba1c018..c517fd496 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1040,8 +1040,9 @@ moves_loop:  // When in check, search starts here
                 // Futility pruning for captures
                 if (!givesCheck && lmrDepth < 7 && !ss->inCheck)
                 {
-                    Value futilityValue = ss->staticEval + 222 + 216 * lmrDepth
-                                        + PieceValue[capturedPiece] + 131 * captHist / 1024;
+                    Value futilityValue = ss->staticEval + 225 + 220 * lmrDepth
+                                        + 275 * (move.to_sq() == prevSq) + PieceValue[capturedPiece]
+                                        + 131 * captHist / 1024;
                     if (futilityValue <= alpha)
                         continue;
                 }