Half moves

In my ongoing game currently we have played 44 moves. There is also reported 21 "half moves".What is half moves?

"half moves" refers to the amount of half moves since last capture or pawn move. It somehow measures the progress in the game. Captures and pawn moves are the only irreversible chess moves. A draw can be claimed after 50 half-moves without capture or pawn moves.

Each move consists of 2 half moves: one for white and one for black.

Draw can be claimed after 50 moves without a capture or pawn move (100 half-moves).

Thank you, now I understand.

Originally posted by tvochess
Captures and pawn moves are the only irreversible chess moves. A draw can be claimed after 50 half-moves without capture or pawn moves.

Reveal Hidden Content

Reveal Hidden Content

Originally posted by Shallow Blue
Correction: captures, pawn moves and castling [hidden]or moving a previously unmoved king or rook[/hidden] are the only irreversible chess moves. In theory, therefore, castling [hidden]et al.[/hidden] should also be mentioned in the 50 move rule; but who potters about for 50 moves when he hasn't castled yet?

Oh, and another correction: that's 50 full moves, not 50 half-moves. FIDE rule 5.2e.

You can Uncastle and Castle again by accident.

W. Heidenfeld - N. Kerins, Dublin, 1973.