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FIDE article 9.3 says: The game is drawn, upon a correct claim by the player having the move, if:
(a) he writes on his scoresheet, and declares to the arbiter his intention to make a move which shall result in the last 50 moves having been made by both players without the movement of any pawn, and without the capture of any piece, or
(b) the last 50 consecutive moves been made by each player without the movement of any pawn and without the capture of any piece.
kloosterveen wrote: *maybe (a) and (b) look the same, but it is not. In case (b) your opponent made that 50th. move, but did not claim the draw. Claiming this kind of draw cannot be done on the 51th. move anymore. |
Your last sentence is not true. The draw can be claimed at any point after and including the fiftieth move. For example, if you and I have made 148 moves without captures or pawn moves, the last fifty moves by each of us have not involved any captures or pawn moves, so the draw may be claimed (ignoring, in effect, the first 98 of the moves).
The point is that only the player whose turn it is can claim a draw under this rule. Suppose the last capture or pawn move was made by Black and that, since then, White has made fifty moves and Black has made 49. It is, therefore, Black's turn. Black may announce that he is not going to capture or move a pawn and claim the draw before making his move, using part (a). However, suppose he makes his move. It is now White's turn so Black can no longer claim a draw. White can claim a draw using part (b) or he could make a move that is not a capture or pawn move, in which case Black can no longer claim the draw.
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