user1809: I played a game of chess recently where we agreed to a rules modification: When one player was reduced to a lone King, a draw could be declared after 16 moves without capture/Pawn move. During this game, the player with material delivered checkmate on move 16. So what happens? Does the checkmate count first, or does the draw?

user15433: Obviously, checkmate, the agreed upon stalemate was "AFTER" the 16th move. The opponent was mated on the 16th move, so checkmate.

user1540: Typically for the 50 move rule it's 50 ply from both sides without a pawn move or capture so the claim can only be made AFTER 50 moves.  The position on the board always stands so checkmate is checkmate.

1809: <p>I played a game of chess recently where we agreed to a rules modification: When one player was reduced to a lone King, a draw could be declared after 16 moves without capture/Pawn move. During this game, the player with material delivered checkmate on move 16. So what happens? Does the checkmate count first, or does the draw?</p>
 15433: <p>Obviously, checkmate, the agreed upon stalemate was "AFTER" the 16th move. The opponent was mated on the 16th move, so checkmate.</p>
 1540: <p>Typically for the 50 move rule it's 50 ply from both sides without a pawn move or capture so the claim can only be made AFTER 50 moves.  The position on the board always stands so checkmate is checkmate.</p>
