This is literally a mate in 1, but White has no choice besides mating in 1 or stalemating. I made a tournament like this before, but some players as White made a bunch of useless moves before mating. So now you have no choice. Checkmate, or get eliminated. Let's see how this goes.
New tournament
It's almost been a year so lets keep the tradition going
https://www.chess.com/tournament/literally-a-mate-in-1-but-we-reboot-the-series
Another mate in 1 tournament... again!!!
GG, this tournament has passed 50 rounds! If you guys want a tournament just like this one but white only has ONE legal move which is mate, check this one out! It's a really cool position from @Aron_08. https://www.chess.com/tournament/literally-a-mate-in-1-but-your-only-move-is-checkmate
New mate in 1 tournament!
Literally a mate in 1 BUT larger groups is here!
https://www.chess.com/tournament/literally-a-mate-in-1-but-no-more-trolls-but-theres-larger-groups