(jonnywildboar) wrote in rec.games.chess.misc:

I was watching a game at a local rapidplay congress, anyway, this guy
pushed his WHITE pawn for promotion but picked up a BLACK queen and
replaced the pawn on the 8th rank, could black then have moved the
queen and claimed it as his own ? (he just re-took it with a rook)

The promotion move cost white the game immediately, as it's illegal:

FIDE Laws of Chess:

3.7.e When a pawn reaches the rank furthest from its starting position it
must be exchanged as part of the same move for a queen, rook, bishop or
knight **of the same colour**. The player's choice is not restricted to
pieces that have been captured previously. This exchange of a pawn for
another piece is called 'promotion' and the effect of the new piece is
immediate.


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