44... d1=Q+45. Nxd1Rxd1+46. Kh2Qd847. Qe6
There are 35,369 more.
Every one is the critical moment from a real grandmaster game, and no position is ever shown twice.
Keep playingFound by reading 303,236 games from 1,757 grandmasters, and checked by the engine before it reached you.