kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 08:43:09 +00:00
Code Issues Releases Wiki Activity

Fix a subtle bug in Position::move_is_capture()

Browse source 
Currently fails if we test with a move that is not of
from the side to move but from the opponent.

This is the typical case of the threat from null move
search. The result is an erroneus prune of the defending
moves, see PruneDefendingMoves in ok_to_prune()

Fix the test to work also with threat moves.

Bug was always in but was unhidden by a patch of 17/12/2008
"Trigger of PawnEndgameExtension if capture is not a pawn"

Until then it was hidden by a tricky check in the prune
conditions instead of the natural move_is_capture()

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-02-13 14:17:39 +01:00
parent 30e8f0c9ad
commit 52ed0e9563
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/position.cpp
View file

@ -665,7 +665,7 @@ bool Position::move_is_capture(Move m) const {
assert(m != MOVE_NONE);
return ( !square_is_empty(move_to(m))
&& (color_of_piece_on(move_to(m)) == opposite_color(side_to_move()))
&& (color_of_piece_on(move_to(m)) != color_of_piece_on(move_from(m)))
)
|| move_is_ep(m);
}