In the video, why does the game call checkmate after those two moves?

Question

In: Other

Answer 1

Black queen D8 to H4 is a checkmate. The queen cannot be captured and there are no pieces that can move in between her and the white king who cannot move out of the way.

This is called the fools mate or idiot mate, and is the fastest way black can win a game possible requiring only four moves, two per player.