From: Marco Costalba <mcostalba@gmail.com>
Date: Fri, 22 Mar 2013 19:57:31 +0000 (+0100)
Subject: Increase non-PV IID search depth
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=81e9cf043a7e8ac1aeb579e6ad17c695f7fb3d47

Increase non-PV IID search depth

bench: 5146380
---

diff --git a/src/search.cpp b/src/search.cpp
index 7a06dad9..8ef2513d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -745,7 +745,7 @@ namespace {
         && ttMove == MOVE_NONE
         && (PvNode || (!inCheck && ss->staticEval + Value(256) >= beta)))
     {
-        Depth d = (PvNode ? depth - 2 * ONE_PLY : depth / 2);
+        Depth d = (PvNode ? depth - 2 * ONE_PLY : depth - 4 * ONE_PLY);
 
         ss->skipNullMove = true;
         search<PvNode ? PV : NonPV>(pos, ss, alpha, beta, d);