Halfmove Clock

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The Halfmove Clock inside an chess position object takes care of enforcing the fifty-move rule. This counter is reset after captures or pawn moves, and incremented otherwise. Also moves which lose the castling rights, that is rook- and king moves from their initial squares, including castling itself, increment the Halfmove Clock. However, those moves are irreversible in the sense to reverse the same rights - since once a castling right is lost, it is lost forever, as considered in detecting repetitions.

=See also=
 * Fifty-move Rule
 * Halfmove Clock in the Forsyth-Edwards Notation
 * Ply
 * Repetitions

=Forum Posts=
 * Half Move Clock Confusion by HumbleProgrammer, OpenChess Forum, January 10, 2013 » Fifty-move Rule, Repetitions
 * Fifty move counter and Null move by Tamás Kuzmics, CCC, August 09, 2017 » Fifty-move Rule, Null Move Pruning

=External Links=
 * plycount - Wiktionary
 * Counter from Wikipedia
 * Clock (disambiguation) from Wikipedia
 * Clock from Wikipedia
 * Game clock from Wikipedia

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