Whenever a game shall be annulled, the party having the move in that game shall have it in the next game. An annulled game must be considered, in every respect, the same as if it had never been begun.
Concessions. The concession of an indulgence by one player does not give him the right of a similar, or other, indulgence from his opponent.
Errors. If, during the course of the game, it be discovered that any error or illegality has been committed, the moves must be retraced and the necessary correction made, without penalty. If the moves cannot be correctly retraced, the game must be annulled.
If a man be dropped from the board and moves made during its absence, such moves must be retraced and the man restored. If this cannot be done, to the satisfaction of the Umpire, the game must be annulled.
Castling. The King can be Castled only:
When neither the King nor the Castling Rook has been moved, and
When the King is not in check, and
When all the squares between the King and Rook are unoccupied, and
When no hostile man attacks the square on which the King is to be placed, or the square he crosses.