in reply to Perl Chess Server

One seldom observed legal move is a pawn taking a pawn "en passant". This happen when a pawn moves 2 spaces and stops besides an opposing pawn, which can then move in a diagonal, behind the first pawn, and takes him out in the process.

the castling rule that is tricky is that a king can not castle when in check or if it passes over a square that would be in check.

Tiago

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Re: Re: Perl Chess Server
by zenmaster (Beadle) on Jan 19, 2002 at 13:00 UTC
    the castling rule that is tricky is that a king can not castle when in check or if it passes over a square that would be in check.

    Or if the king (or rook) has already moved...(even if they're now at their initial position.
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