Use see() instead of see_sign() in previous patch

mcostalba · mcostalba · commit 187a9fe5e7b8 · 2014-06-03T12:38:58.000+02:00
Before it was working by accident in case of
see_sign() and failing with see() due to how
castle moves are coded (king captures the rook).

Better to explicitly filter out castling moves
and use see() without any surprise/trick.

No functional case.
diff --git a/src/search.cpp b/src/search.cpp
@@ -870,8 +870,9 @@ namespace {
 
           // Decrease reduction for moves that escape a capture
           if (   ss->reduction
+              && type_of(move) == NORMAL
               && type_of(pos.piece_on(to_sq(move))) != PAWN
-              && pos.see_sign(make_move(to_sq(move), from_sq(move))) < 0)
+              && pos.see(make_move(to_sq(move), from_sq(move))) < 0)
               ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
 
           Depth d = std::max(newDepth - ss->reduction, ONE_PLY);
