King to Bunker Leap is a new "king safety" rule devised to make the remaining 1920 (2880 -960) possible start positions more appealing to chess players.

This new rule can be applied to both Shuffle chess and to the very interesting Pre-chess - a game in which each side sets up their own pieces in the back rank. Basically it boils down to this: During the course of play, either side can move the king from the original square to the b or g file jumping over any friendly pieces if necessary. This move can be carried out only once, takes a turn and is subject to similar restriction as in castling. The only difference is that the rook is not involved and the king can actually jump.

For full details see: http://chess.computerwebservices.net/kingbunkerleap.php