From 6170558d9377cbef8b42007ac085b9c9941a2b70 Mon Sep 17 00:00:00 2001
From: cj5716 <125858804+cj5716@users.noreply.github.com>
Date: Tue, 13 Feb 2024 17:50:16 +0800
Subject: [PATCH] Simplify TT PV reduction

This also removes some incorrect fail-high logic.

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 87968 W: 22634 L: 22468 D: 42866
Ptnml(0-2): 315, 10436, 22323, 10588, 322
https://tests.stockfishchess.org/tests/view/65cb3b641d8e83c78bfd04a9

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 70794 W: 17846 L: 17672 D: 35276
Ptnml(0-2): 44, 7980, 19189, 8126, 58
https://tests.stockfishchess.org/tests/view/65cccee21d8e83c78bfd222c

closes #5055

Bench 1203823
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 9574465388e..590ead0f304 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1107,7 +1107,7 @@ Value Search::Worker::search(
 
         // Decrease reduction if position is or has been on the PV (~5 Elo)
         if (ss->ttPv)
-            r -= 1 + (ttValue > alpha) + (ttValue > beta && tte->depth() >= depth);
+            r -= 1 + (ttValue > alpha) + (tte->depth() >= depth);
 
         // Increase reduction for cut nodes (~4 Elo)
         if (cutNode)