From: Marco Costalba <mcostalba@gmail.com>
Date: Wed, 27 Feb 2013 07:07:26 +0000 (+0100)
Subject: Remove pruning condition on alpha
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=bc38efd1288c8cb25179935998cfa3dc6c9f4410

Remove pruning condition on alpha

Further simplifying on Lucas's idea, seems reliable
in tests:

ELO: 2.15 +-7 (95%) LOS: 84.9%
Total: 9999 W: 1831 L: 1769 D: 6399
---

diff --git a/src/search.cpp b/src/search.cpp
index c039b64e..b235a1e6 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -860,8 +860,7 @@ split_point_start: // At split points actual search starts from here
       if (   !captureOrPromotion
           && !inCheck
           && !dangerous
-          &&  move != ttMove
-          &&  alpha > VALUE_MATED_IN_MAX_PLY)
+          &&  move != ttMove)
       {
           // Move count based pruning
           if (   !PvNode