Irreversible Moves

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Irreversible Moves can not be reversed. Thus, they are either captures or pawn moves. Making those irreversible moves, resets the halfmove clock inside a position object to zero, concerning the fifty-move rule. Quiet and otherwise reversible moves, which lose the castling rights, that is rook- and king-moves from their initial square, including castling itself, are irreversible in the sense to reverse the same rights - since once a castling right is lost, it is lost forever, and reset the position index to determine repetition of positions. However, those "irreversible" moves don't reset, but increment the halfmove clock.

=See also=
 * Fifty-move Rule
 * Halfmove Clock
 * Reversible Moves

=External Links=
 * Irreversible (disambiguation) from Wikipedia
 * Irreversible process from Wikipedia
 * Point of no return from Wikipedia

=References=

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