From 54cf226604cfc9d17f432fa0b5bca56277e5561c Mon Sep 17 00:00:00 2001
From: FauziAkram <fauzi.dabat@hotmail.com>
Date: Fri, 1 Nov 2024 13:54:50 +0300
Subject: [PATCH] Revert VLTC regression from #5634

https://tests.stockfishchess.org/tests/view/671bf61b86d5ee47d953cf23

And thanks to @xu-shawn for suggesting running a VLTC regress test since
depth modifications affect scaling. Also, the LTC was showing a slight
regress after 680+k games  ~= -0.34 , for reference:
https://tests.stockfishchess.org/tests/view/67042b1f86d5ee47d953be7c

closes https://github.com/official-stockfish/Stockfish/pull/5663

Bench: 1307308
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 1b9b745c..5c6a62c8 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -850,7 +850,7 @@ Value Search::Worker::search(
     // For cutNodes, if depth is high enough, decrease depth by 2 if there is no ttMove,
     // or by 1 if there is a ttMove with an upper bound.
     if (cutNode && depth >= 7 && (!ttData.move || ttData.bound == BOUND_UPPER))
-        depth -= 2;
+        depth -= 1 + !ttData.move;
 
     // Step 11. ProbCut (~10 Elo)
     // If we have a good enough capture (or queen promotion) and a reduced search