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12

Best guess: the mistake occured before, on move 15 Entry errors are frequent when games are entered into a software, especially if they are not entered by one of the players. Here the operator must have made an error before move 19, reached an anomaly, and couldn't solve the mystery (or didn't have time to try, there are other games to be saved). In such ...


1

I have an alternative hypothesis. When I looked at the game before move 19, it seemed to me that White has a big advantage by pushing f6. Indeed, Stockfish (10+) agrees. It could be that Black resigned after move 18, but one or both of them was curious as to whether Black could save the game if given an extra move, so they continued playing after skipping ...


4

I do not think that the game just ended there. It is more likely that the second source simply could not handle the null move. This is a bit unusual that it would be so through, but looking at the subsequent moves, we can rule out almost every move there, and figure out what had to have been played. The available moves on move 19 are: Kb1, Qd2 moves, Rd1, ...


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