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 in the moves of the pieces, 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
Where the King is not in check, and