That seems wonky. I mean, what is the player supposed to do? Do other moves instead and end up losing the game? That wouldn't be a fair outcome either.Mathew5000 wrote: ↑03 May 2026, 19:02 11.3.1 During play the players are forbidden to use any notes, sources of information or advice, or analyse any game on another chessboard. [italics mine]
Also, let's say the player devised the checkmate, then some stupid spectator blurts out the last move. So the player who was supposed to win now has to refrain from checkmating. What are their options after that? How different does the board situation need to be for a new checkmate to be considered a "different" one than the cheating one? If they just delay things by creating some action in other parts of the board, is it considered a new legal checkmate? Or does the position of the King and other involved pieces need to be different? By how much?
As you can see, this sounds like a total headache and something that would be impossible to reach an objective agreement on.
Another example: let's say the player devised a "risky" checkmate where they absolutely need to do the checkmate at the point they planned, otherwise the other player will be able to checkmate themselves on the next move. Not actually risky in reality, since they are in control of what they are doing, but what if a spectator decides to blurt out the checkmate move at the last moment? Now the player is forced to do any other move instead, and as a result lose the game on the next move.