Black plays 11 consecutive moves, without reply from White, after which White mates in one! HOW?

This is the position: lichess.org/analysis/4k3/8/3B1K2/8/4p3/8/4P3/3B1N2_b_-_-_0_1

Do the moves have to be legal or can black move the king through squares that would be check?

Have to be legal

This is a crazy puzzle

This is from Advent of chess, AGAIN

there's gotta be a sneaky trick...regular chess? or variations included?! lol

What is the point of doing puzzles for "Advent of Chess", when you always ask other people to do puzzles for you?
I mean it is just poor sportsmanship and disrespectful to other contenders.

play 11 moves and resign

@a1411 said in #8:
> play 11 moves and resign
but it says checkmate in one. i like the way you think tho

@Ben_Rover said in #2:
> Do the moves have to be legal or can black move the king through squares that would be check?
even if you could, how would that help? i don't see anything here lol