56... Rg6+57. Kc7Rg758. Kxc6Rg6+59. Kc7
There are 31,733 more.
Every one is the critical moment from a real grandmaster game, and no position is ever shown twice.
Keep playingFound by reading 277,610 games from 1,753 grandmasters, and checked by the engine before it reached you.