28... Nxb429. Rg1Qc1+30. Qd1Qc4+31. Qe2
There are 31,730 more.
Every one is the critical moment from a real grandmaster game, and no position is ever shown twice.
Keep playingFound by reading 277,570 games from 1,753 grandmasters, and checked by the engine before it reached you.