kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 16:53:09 +00:00
Code Issues Releases Wiki Activity

Remove a drawing rule from KBPsK function

Browse source 
The rule can be incorrect if the attacking king is
well placed e.g. 8/6K1/8/8/7k/1B6/7P/8 w - - 0 1

bench: 8279065
This commit is contained in:
Chris Caino 2013-10-14 19:53:08 +02:00 • committed by Marco Costalba
parent d9be00342c
commit 0c68971c13
1 changed files with 2 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
src/endgame.cpp
View file

@ -407,19 +407,8 @@ ScaleFactor Endgame<KBPsK>::operator()(const Position& pos) const {
Square kingSq = pos.king_square(weakSide);
if ( opposite_colors(queeningSq, bishopSq)
&& abs(file_of(kingSq) - pawnFile) <= 1)
{
// The bishop has the wrong color, and the defending king is on the
// file of the pawn(s) or the adjacent file. Find the rank of the
// frontmost pawn.
Square pawnSq = frontmost_sq(strongSide, pawns);
// If the defending king has distance 1 to the promotion square or
// is placed somewhere in front of the pawn, it's a draw.
if ( square_distance(kingSq, queeningSq) <= 1
|| relative_rank(weakSide, kingSq) <= relative_rank(weakSide, pawnSq))
return SCALE_FACTOR_DRAW;
}
&& square_distance(queeningSq, kingSq) <= 1)
return SCALE_FACTOR_DRAW;
}
// All pawns on same B or G file? Then potential draw