From: Marco Costalba <mcostalba@gmail.com>
Date: Thu, 17 Feb 2011 08:08:27 +0000 (+0100)
Subject: Do not special case reductions for MultiPV case
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=5815718177817de90f98513b776bc04376440f0a

Do not special case reductions for MultiPV case

Note that this introduces an asymmetry in which best move
is searched deeper then others also in MultiPV, but this is
not an error per se.

No functional change when MultiPV = 1

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

diff --git a/src/search.cpp b/src/search.cpp
index c1cbc9ef..b0d359d1 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1153,8 +1153,7 @@ split_point_start: // At split points actual search starts from here
               &&  ss->killers[0] != move
               &&  ss->killers[1] != move)
           {
-              ss->reduction = Root ? reduction<PvNode>(depth, moveCount - MultiPV + 1)
-                                   : reduction<PvNode>(depth, moveCount);
+              ss->reduction = reduction<PvNode>(depth, moveCount);
               if (ss->reduction)
               {
                   alpha = SpNode ? sp->alpha : alpha;