TalkChess.com

Chessbase wrote:
It was topy-turvy to say the least, right from the word go. Magnus' game with Inarkiev had the strangest finish you will see in professional chess. And you'd never know it just by looking at the game in isolation.

In the final position, with both sides having seconds on the clock, Inarkiev was in check, but he didn't see it and instead played Ne3+ — an illegal move — checking Carlsen's king! Somehow Magnus himself didn't register that this move was illegal, even though he had just put his opponent in check on the prior move. He should have stopped the clock and claimed the illegal move. But he played Kd3. Suddenly, Inarkiev realized what happened, and stopped the clock himself to summon the arbiter, claiming a win by virtue of Magnus' making an illegal move! And after a brief discussion at the board, the arbiter ruled the game a black win!

https://en.chessbase.com/post/world-bli ... -grab-lead

Instantly Even Carlsen admits defeat,,, at that moment.
But in these game levels the electronic game controls and video cameras make failure impossible.

Those of us who have played live chess know how difficult it is to claim in these fast games when it's only up to you and your opponent,,,,

True Dat!

I just wonder how one gets the idea to do that. That was just super insane

We used to do that all the time, when I was still playing blitz. When behind in time in a dead drawn Pawn ending, where the opponent tried to push us through the flag, by moving the King back and forth in opposition, we would pre-condition him by making a speed contest of it, and then suddenly step our King diagonally forward instead of sideways, ending up next to his King. 10 to 1 that he would react to the move he expected, rather than the one we actually played, staying adjacent to our King, and would realize this only after pressing the clock. Then we would claim the game.

hgm wrote:We used to do that all the time, when I was still playing blitz. When behind in time in a dead drawn Pawn ending, where the opponent tried to push us through the flag, by moving the King back and forth in opposition, we would pre-condition him by making a speed contest of it, and then suddenly step our King diagonally forward instead of sideways, ending up next to his King. 10 to 1 that he would react to the move he expected, rather than the one we actually played, staying adjacent to our King, and would realize this only after pressing the clock. Then we would claim the game.

The solution is to play always with an increment so nobody is going to try to win on time.

Even in blitz tournaments that I played in the last years there was an increment of 2 seconds per move.