21 move rule.



have him show you documentation.
start the game and claim draw after 3 moves, claim 3 move rule. its literally the same thing, there is no official rule anywhere i can tell that holds this 21 move rule.

Most official matches last longer than 21 moves, therefore if it is a high ranking match, the so-called 21-move-rule is undoubtedly irrelevant.

I bet it has something to do with him almost losing a game (22 moves) then made something up about a 21 move rule to scramble for a draw.