From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 30 Oct 2010 14:28:33 +0000 (+0100)
Subject: Allow razoring after a null move
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=03dd1d3c133577f33d34cbd8f0adc93dc85dc7ab;p=fairystockfish.git

Allow razoring after a null move

After 8322 games on Russian Cluster
Mod- Orig:  1341 - 1281 - 5700 ELO +2 (+- 3) LOS 75%

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/search.cpp b/src/search.cpp
index f7718ce..66a27fa 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1070,7 +1070,6 @@ namespace {
         && !isCheck
         &&  refinedValue < beta - razor_margin(depth)
         &&  ttMove == MOVE_NONE
-        &&  (ss-1)->currentMove != MOVE_NULL
         && !value_is_mate(beta)
         && !pos.has_pawn_on_7th(pos.side_to_move()))
     {