From f8c00dda071310a11f8be60993e8cdec4a95961e Mon Sep 17 00:00:00 2001
From: Jay Honnold <jayhonnold@gmail.com>
Date: Sat, 16 Nov 2024 07:03:13 -0700
Subject: [PATCH] Bench: 2625158

---
 src/search.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/search.c b/src/search.c
index 015c465c..55926f2d 100644
--- a/src/search.c
+++ b/src/search.c
@@ -511,11 +511,12 @@ int Negamax(int alpha, int beta, int depth, int cutnode, ThreadData* thread, PV*
   MovePicker mp;
   if (!isPV && !inCheck) {
     const int opponentHasEasyCapture = !!OpponentsEasyCaptures(board);
+    const int opponentDeclining = ss->staticEval + (ss - 1)->staticEval > 1;
 
     // Reverse Futility Pruning
     // i.e. the static eval is so far above beta we prune
     if (depth <= 9 && !ss->skip && eval < TB_WIN_BOUND && eval >= beta &&
-        eval - 70 * depth + 118 * (improving && !opponentHasEasyCapture) >= beta &&
+        eval - 70 * depth + 118 * (improving && !opponentHasEasyCapture) + 25 * opponentDeclining >= beta &&
         (!hashMove || GetHistory(ss, thread, hashMove) > 11800))
       return (eval + beta) / 2;