From a5643b89fda5060d4b40dff54afe02816c899dd4 Mon Sep 17 00:00:00 2001
From: MinetaS <skdty87@gmail.com>
Date: Fri, 7 Apr 2023 14:30:59 +0000
Subject: [PATCH] Remove extraReduction

Since bestValue becomes value and beta - alpha is always non-negative,
extraReduction is always false, hence it has no effect.

This patch includes small changes to improve readability.

closes https://github.com/official-stockfish/Stockfish/pull/4505

No functional change
---
 src/search.cpp | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index 5d54a15d..4463b42a 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1335,15 +1335,14 @@ moves_loop: // When in check, search starts here
 
               if (PvNode && value < beta) // Update alpha! Always alpha < beta
               {
-
                   // Reduce other moves if we have found at least one score improvement (~1 Elo)
                   if (   depth > 1
-                      && ((improving && complexity > 971) || (value < (5 * alpha + 75 * beta) / 87) || depth < 6)
+                      && (   (improving && complexity > 971)
+                          || value < (5 * alpha + 75 * beta) / 87
+                          || depth < 6)
                       && beta  <  12535
-                      && value > -12535) {
-                      bool extraReduction = depth > 2 && alpha > -12535 && bestValue != -VALUE_INFINITE && (value - bestValue) > (7 * (beta - alpha)) / 8;
-                      depth -= 1 + extraReduction;
-                  }
+                      && value > -12535)
+                      depth -= 1;
 
                   assert(depth > 0);
                   alpha = value;
-- 
2.39.2