From d34bb889b185e6796bbebb9bb3c2b85c8132d7cb Mon Sep 17 00:00:00 2001
From: Joona Kiiski <joona.kiiski@gmail.com>
Date: Fri, 1 Nov 2013 20:42:47 +0000
Subject: [PATCH] Test Easy Move if no BestMoveChanges

In case we find a very good move after a
troubled start, we don't return immediately
anymore.

Tested directly at long TC where it passed:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 13910 W: 2397 L: 2228 D: 9285

bench: 7995098
---
 src/search.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/search.cpp b/src/search.cpp
index e2ab9cd9..c0a98236 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -19,6 +19,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <cfloat>
 #include <cmath>
 #include <cstring>
 #include <iostream>
@@ -440,6 +441,7 @@ namespace {
 
             // Stop search early if one move seems to be much better than others
             if (    depth >= 12
+                &&  BestMoveChanges <= DBL_EPSILON
                 && !stop
                 &&  PVSize == 1
                 &&  bestValue > VALUE_MATED_IN_MAX_PLY
-- 
2.39.2