From 72a345873d9cf24542dc73cd5a28eba7d23b0d2b Mon Sep 17 00:00:00 2001
From: Muzhen Gaming <61100393+XInTheDark@users.noreply.github.com>
Date: Wed, 22 May 2024 09:09:04 +0800
Subject: [PATCH] Revert "Reduce When TTValue is Above Alpha"

The patch regressed significantly at longer time controls. In
particular, the `depth--` behavior was predicted to scale badly based on
data from other variations of the patch.

Passed VVLTC 1st sprt:
https://tests.stockfishchess.org/tests/view/664d45cf830eb9f886616c7d
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 51292 W: 13242 L: 12954 D: 25096
Ptnml(0-2): 5, 4724, 15896, 5020, 1

Passed VVLTC 2nd sprt:
https://tests.stockfishchess.org/tests/view/664e641a928b1fb18de4e385
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 41884 W: 10933 L: 10634 D: 20317
Ptnml(0-2): 1, 3759, 13125, 4054, 3

closes https://github.com/official-stockfish/Stockfish/pull/5283

Bench: 1503815
---
 src/search.cpp | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index a98468ec..47766730 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -833,12 +833,9 @@ Value Search::Worker::search(
     if (PvNode && !ttMove)
         depth -= 3;
 
-    if (!PvNode && ss->ttHit && (tte->bound() & BOUND_UPPER) && ttValue > alpha + 5 * depth)
-        depth--;
-
     // Use qsearch if depth <= 0.
     if (depth <= 0)
-        return qsearch < PvNode ? PV : NonPV > (pos, ss, alpha, beta);
+        return qsearch<PV>(pos, ss, alpha, beta);
 
     // 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.