From: Lucas Braesch <lucas.braesch@gmail.com>
Date: Sat, 7 Sep 2013 07:32:01 +0000 (+0200)
Subject: Singular extension at 8 plies also for PV nodes
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=59702aca0d0aa322a3260e31feeae22a1a8f8341;ds=sidebyside

Singular extension at 8 plies also for PV nodes

Passed both short TC:
LLR: 2.96 (-2.94,2.94)
Total: 11451 W: 2455 L: 2282 D: 6714

And long TC
LLR: 2.96 (-2.94,2.94)
Total: 15813 W: 2907 L: 2723 D: 10183

bench: 3864419
---

diff --git a/src/search.cpp b/src/search.cpp
index 17d52cae..061689e8 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -780,7 +780,7 @@ moves_loop: // When in check and at SpNode search starts from here
 
     singularExtensionNode =   !RootNode
                            && !SpNode
-                           &&  depth >= (PvNode ? 6 * ONE_PLY : 8 * ONE_PLY)
+                           &&  depth >= 8 * ONE_PLY
                            &&  ttMove != MOVE_NONE
                            && !excludedMove // Recursive singular search is not allowed
                            && (tte->bound() & BOUND_LOWER)