Chess Inventor.

INVENT A SPECIAL MOVE!

YOu know how castling could be called a special move? Well i'd like to hear your suggestions for use - only - once moves. They can be outrageous too. For example I have one:

Kill one of your own pieces to save your king. Done by KING ONLY - usable only once.

What do you have?

Kill the king & promote another piece to succeed as king. {The Macbeth option}

Convert any opponent's piece, save for the King, that's adjacent to one of your Bishops when it's your move to your colour.  Can be used once per Bishop (including pawns that have been promoted to Bishops).

You'd need a few spare pieces to play it.

Yeah, but there's something I find fitting about the idea of Bishops being able to perform "conversions".  At the risk of adding too much complexity, perhaps two Bishops should be able to convert an opposing King if he does not move away from their influence and no opposing Bishop is also adjacent to him (winning the game).

Victory if your king reaches the opposite king's starting postition.

A funny rule. I actually think its application would be so rare that we need a really large number of games before it ever becomes relevant though :P.

Once per game you can remove one of your opponent's pawns from the chessboard.  The removed pawn is regarded as captured.  Do this on your turn in place of a regular move.

(I stole this from the game Knightmare Chess, which provides a whole set of "special" chess moves/abilities.)

The ability to capture one of your own pieces. 

No more of those damned 'bad bishops'! 

Enemy King using one of your own pawns as a shield in the endgame? Not for long.

. . . if only Bobby was still alive he could get behind this with me.

Move a bishop to a vacant square on the same rank of an adjacent file. Usable only once in the game. Cannot be used to block a check or if the move would put your own king in check (of course).

For example: 1. Nf3 d5 2. Bg8, with white's light square bishop now becoming a dark square bishop.

This move could turn bad bishops into good bishops or completely change the value of an endgame. I think it would greatly increase the value of the bishop and completely change some openings. It would be an interesting chess variant!