From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 11 Jun 2011 21:11:17 +0000 (+0100)
Subject: Fix score_captures() for the case of capture promotions
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=4b8a7f2793f0d7dd46d2804cd5f46ccdb080da12

Fix score_captures() for the case of capture promotions

In case we have more than one promotion move, prefer
the one that captures the biggest piece.

Almost no functional change, anyhow I don't expect any
ELO change, it is just the correct thing to do.

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

diff --git a/src/movepick.cpp b/src/movepick.cpp
index 61e5527f..04fa40d6 100644
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -224,11 +224,11 @@ void MovePicker::score_captures() {
   for (MoveStack* cur = moves; cur != lastMove; cur++)
   {
       m = cur->move;
+      cur->score =  pos.midgame_value_of_piece_on(move_to(m))
+                  - pos.type_of_piece_on(move_from(m));
+
       if (move_is_promotion(m))
-          cur->score = QueenValueMidgame;
-      else
-          cur->score =  pos.midgame_value_of_piece_on(move_to(m))
-                      - pos.type_of_piece_on(move_from(m));
+          cur->score += QueenValueMidgame;
   }
 }