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Passed pawns: consider enemy rooks or queens from behind

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Merged from Glaurung 2.2

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-12-22 12:10:15 +01:00
parent 54b7da120f
commit e3b03f13b3
1 changed files with 7 additions and 0 deletions
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7
src/evaluate.cpp
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@ -936,6 +936,13 @@ namespace {
b2 = squares_in_front_of(us, s);
b3 = b2 & ei.attacked_by(them);
b4 = b2 & ei.attacked_by(us);
// If there is an enemy rook or queen attacking the pawn from behind,
// add all X-ray attacks by the rook or queen.
if(bit_is_set(ei.attacked_by(them,ROOK)|ei.attacked_by(them,QUEEN),s)
&& squares_behind(us, s) & pos.rooks_and_queens(them))
b3 = b2;
if((b2 & pos.pieces_of_color(them)) == EmptyBoardBB) {
// There are no enemy pieces in the pawn's path! Are any of the
// squares in the pawn's path attacked by the enemy?