From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 16 Mar 2013 10:20:03 +0000 (+0100)
Subject: Further increase SEE prune depth
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=0586b51f9c398008f264d78a2888c0d68d9561cb

Further increase SEE prune depth

After 16000 games at 60+0.05
ELO: 2.89 +-5.4 (95%) LOS: 96.5%
Total: 16000 W: 2775 L: 2642 D: 10583

bench: 5442365
---

diff --git a/src/search.cpp b/src/search.cpp
index 0416c16c..7a06dad9 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -885,7 +885,7 @@ split_point_start: // At split points actual search starts from here
           }
 
           // Prune moves with negative SEE at low depths
-          if (   predictedDepth < 3 * ONE_PLY
+          if (   predictedDepth < 4 * ONE_PLY
               && pos.see_sign(move) < 0)
           {
               if (SpNode)