Is it possible for checkmate to be the only legal move?

I don't remember how I got into this position:

lichess.org/editor/qqqqq1k1/qqqqqrP1/qqqqqbKP/qqqqqrbn/qqqqqqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq_w_-_-_0_1

#10 is the best solution so far.

The solutions with many many queens are another example of the laziness inherent in todays online chess players

No one mentioned the WP page?

en.wikipedia.org/wiki/Joke_chess_problem#Self-solving_problems

#13 yeah thats where i got it from. idk why people are saying #10 is best, those ones with a bunch of queens arent very elegant

#7 all the checkmates are the same, and if Ne7 was recommended, you'd ask "why not Nf6?"

If you like that topic, you should look up 'selfmate' chess problems online.
That is a type of chess puzzle where you have to force the opponent to mate you (so the mate will always be the only legal move).
There is also a variety of interesting chess puzzle types (eg. helpmate).

#10 is the best, not because it is elegant, but because it is funny.

#8 White can take the bishop instead of pushing the pawn

I mean, #9

remember this dude? @badfishchess
go to his bookmarks, there are 13 games he "won"
meaning that there was an unavoidable win that he had to move and checkmate his opponent
here's an example: lichess.org/XBIurDrr/black#55