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

In reply to Re: Perl Chess Server by tstock
in thread Perl Chess Server by blended

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