From: Marco Costalba <mcostalba@gmail.com>
Date: Tue, 24 Jan 2012 06:17:15 +0000 (+0100)
Subject: Restore LMR depth limit
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=eeef654cd78853c966efe38daf97494bb4caeab1;p=fairystockfish.git

Restore LMR depth limit

It is not clear the advantage and we don't want
to risk of introducing regressions on this
very critical parameter. So revert to old limit.

After 16003 games
Mod vs Orig 2496 - 2421 - 11086 ELO +1 (+-3)

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

diff --git a/src/search.cpp b/src/search.cpp
index f0bbf0f..6f3d6df 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -970,7 +970,7 @@ split_point_start: // At split points actual search starts from here
 
       // Step 15. Reduced depth search (LMR). If the move fails high will be
       // re-searched at full depth.
-      if (   depth > 4 * ONE_PLY
+      if (   depth > 3 * ONE_PLY
           && !isPvMove
           && !captureOrPromotion
           && !dangerous