From eef540ba9c8f4e62a8f886c42203f29c99f1750b Mon Sep 17 00:00:00 2001
From: Muzhen Gaming <61100393+XInTheDark@users.noreply.github.com>
Date: Sat, 6 Jul 2024 19:08:28 +0800
Subject: [PATCH] Simplify ttPv reduction formula

This patch is based on the fact that the ttPv reduction has proven non-linear scaling (as documented in the code, along with testing guidelines); however, the original patch had (erroneously) not been tested at VLTC or longer.
---
 src/search.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index a6bab1db..4b859e40 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1042,8 +1042,7 @@ Value Search::Worker::search(
 
         // Decrease reduction if position is or has been on the PV (~7 Elo)
         if (ss->ttPv)
-            r -= 1 + (ttData.value > alpha) + (ttData.depth >= depth)
-               - (PvNode && ttData.value < alpha && ttData.depth >= depth);
+            r -= 1 + (ttData.value > alpha) + (ttData.depth >= depth);
 
         // Decrease reduction for PvNodes (~0 Elo on STC, ~2 Elo on LTC)
         if (PvNode)