Checkmate in 3

My 4th published composition. I think it's pretty good.

White plays, checkmate in 3.
lichess.org/analysis/standard/1R5B/p7/8/8/B5n1/8/pr2PP2/bk2K1NR_w_K_-#0

It is quite good, I have not solved it yet.

1.nc3 2. kd1 then either b c2#or nd2#

There is no 1. Nc3 here...

oh sorry nf3 then kd1 then either bc2#or nd2#

And after 1. ... Ne3?

I love when castling gives mate. ;) Nice one, @GlowBlock64!

Thanks! Once, I really played a game, where I could in next move checkmate with castling, but opponent resigned, so I didn't enjoyed that feeling: "OMG I really mated with castling LOL!" xD

I'm working on another composition, it should be finished soon.