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 c1cbc9e..b0d359d 100644 (file)
--- 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;