From 0571e4e390acab33ed8ab6e7ce070df69e196dd2 Mon Sep 17 00:00:00 2001
From: Ryan Hirsch <hirsch28@purdue.edu>
Date: Wed, 25 Feb 2026 09:22:26 -0500
Subject: [PATCH] More NMP when improving

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 89472 W: 23291 L: 22895 D: 43286
Ptnml(0-2): 317, 10389, 22942, 10757, 331
https://tests.stockfishchess.org/tests/view/699f070c3ece4c464328a26f

Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 95880 W: 24537 L: 24098 D: 47245
Ptnml(0-2): 55, 10259, 26880, 10684, 62
https://tests.stockfishchess.org/tests/view/699fb9be44b9136df1165ded

closes https://github.com/official-stockfish/Stockfish/pull/6638

bench: 2534375
---
 AUTHORS        | 1 +
 src/search.cpp | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/AUTHORS b/AUTHORS
index fc987c8da..853dd3a7a 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -223,6 +223,7 @@ Ron Britvich (Britvich)
 rqs
 Rui Coelho (ruicoelhopedro)
 rustam-cpp
+Ryan Hirsch
 Ryan Schmitt
 Ryan Takker
 Sami Kiminki (skiminki)
diff --git a/src/search.cpp b/src/search.cpp
index 8c9c4f8bc..74e0c1233 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -890,7 +890,7 @@ Value Search::Worker::search(
     }
 
     // Step 9. Null move search with verification search
-    if (cutNode && ss->staticEval >= beta - 17 * depth + 359 && !excludedMove
+    if (cutNode && ss->staticEval >= beta - 17 * depth - 50 * improving + 359 && !excludedMove
         && pos.non_pawn_material(us) && ss->ply >= nmpMinPly && !is_loss(beta))
     {
         assert((ss - 1)->currentMove != Move::null());