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Fix KBNK endgame

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Broken by recent patch. Also better document what's
happening there.

Verified to restore original behaviour.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-07-25 21:47:54 +01:00
parent 6b6f3c4ca4
commit 5ee7dfebf7
2 changed files with 5 additions and 2 deletions
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5
src/endgame.cpp
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@@ -152,7 +152,10 @@ Value EvaluationFunction<KBNK>::apply(const Position& pos) const {
Square loserKSq = pos.king_square(weakerSide);
Square bishopSquare = pos.piece_list(strongerSide, BISHOP, 0);
if (same_color_squares(bishopSquare, SQ_A1))
// kbnk_mate_table() tries to drive toward corners A1 or H8,
// if we have a bishop that cannot reach the above squares we
// mirror the kings so to drive enemy toward corners A8 or H1.
if (!same_color_squares(bishopSquare, SQ_A1))
{
winnerKSq = flop_square(winnerKSq);
loserKSq = flop_square(loserKSq);