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Rules

All standard chess rules apply: en passant is allowed, pawns promote to any piece, and stalemates are a draw.

The only catch, however, is that castling is possible between the king and any of its pieces on the starting rank before movement. The king will simply switch spaces with the castling piece in all cases except the far pawn, in which case the king will travel one space to the right, and the pawn will lie where the king was before.

An example of white castling with their far pawn can be expressed as [ 1. c2 b3 2. O-O-O ... ] with the resulting structure leaving the knight on a1, a pawn on b1, the king on c1, and the other pawn on c2. Here is what that would look like on the board:

1. c2	1. c2 b3	2. O-O-O