Follow-up Comment #9, bug #27153 (project xboard):
The following piece of code (in UserMoveTest() in backend.c)
filters out perfectly good premoves - the ones that put a piece
on a piece of the same color. Removing those lines gives
premove handling like in xboard 4.2.7:
/* note: this code seems to exist for filtering out some obviously
illegal premoves */
if ( gameMode != EditPosition &&
(WhitePawn <= pdown && pdown < BlackPawn &&
WhitePawn <= pup && pup < BlackPawn ||
BlackPawn <= pdown && pdown < EmptySquare &&
BlackPawn <= pup && pup < EmptySquare
) && !((gameInfo.variant == VariantFischeRandom ||
gameInfo.variant == VariantCapaRandom) &&
(pup == WhiteRook && pdown == WhiteKing && fromY == 0 &&
toY == 0||
pup == BlackRook && pdown == BlackKing && fromY ==
BOARD_HEIGHT-1 && toY == BOARD_HEIGHT-1 )
) )
return ImpossibleMove;
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