From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 17 Sep 2011 15:41:01 +0000 (+0100)
Subject: Correctly score capture underpromotions
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=10b24af98af777c58e8a11137075f24207f4746d;ds=sidebyside

Correctly score capture underpromotions

Be sure a queen capture promotion is tried in front of
an underpromotion.

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

diff --git a/src/movepick.cpp b/src/movepick.cpp
index e9f31456..c898127f 100644
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -255,7 +255,7 @@ void MovePicker::score_captures() {
                   - piece_type(pos.piece_on(move_from(m)));
 
       if (move_is_promotion(m))
-          cur->score += QueenValueMidgame;
+          cur->score += piece_value_midgame(Piece(promotion_piece_type(m)));
   }
 }
 
@@ -331,8 +331,7 @@ Move MovePicker::get_next_move() {
               if (seeValue >= captureThreshold)
                   return move;
 
-              // Losing capture, move it to the tail of the array, note
-              // that move has now been already checked for pseudo legality.
+              // Losing capture, move it to the tail of the array
               (--badCaptures)->move = move;
               badCaptures->score = seeValue;
           }