From b79ac764ff1662b40d5480595bafb599b72512eb Mon Sep 17 00:00:00 2001
From: Shawn Xu <xu107288696@gmail.com>
Date: Mon, 1 Jul 2024 21:57:53 -0700
Subject: [PATCH] Simplify in-check condition for Probcut-in-check

dont let your memes be dreams !?

Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 512000 W: 132193 L: 132497 D: 247310
Ptnml(0-2): 1600, 61170, 130704, 60986, 1540
https://tests.stockfishchess.org/tests/view/66838911c4f539faa03268a2

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 380268 W: 95894 L: 96042 D: 188332
Ptnml(0-2): 193, 42861, 104180, 42701, 199
https://tests.stockfishchess.org/tests/view/6688d0550c9d7c1ab33ed5a8

closes https://github.com/official-stockfish/Stockfish/pull/5443

Bench: 1130282
---
 src/search.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index ffe6e04b..1bce9daa 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -927,10 +927,9 @@ Value Search::Worker::search(
 
 moves_loop:  // When in check, search starts here
 
-    // Step 12. A small Probcut idea, when we are in check (~4 Elo)
+    // Step 12. A small Probcut idea (~4 Elo)
     probCutBeta = beta + 390;
-    if (ss->inCheck && (ttData.bound & BOUND_LOWER) && ttData.depth >= depth - 4
-        && ttData.value >= probCutBeta && std::abs(ttData.value) < VALUE_TB_WIN_IN_MAX_PLY
+    if ((ttData.bound & BOUND_LOWER) && ttData.depth >= depth - 4 && ttData.value >= probCutBeta
         && std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY)
         return probCutBeta;