Larry Smith wrote on Wed, Nov 5, 2008 04:25 AM UTC:
Of course, the players do not have to inform the other that their move resulted in a check. Only that they've moved their King to remove this possible check. The attacking player could then suppose that the previous position resulted in a check.
And simply making a King move could fool an opponent into thinking that they had made a checking move. And thus draw them into a negative position.
Also, players could play on-line. They would send the TXT of each King move in a password-protected ZIP file. At the end of the game, they would then exchange passwords. Allowing each to verify the legality of the game played.
And, this could also work in the real-world. Each King move and its turn number is written on a slip of paper and dropped into a container. Which is then checked at the end of the game. This would still mean that a record of play needs to be kept for the entire game.