You're Ready for 960!

Let's tally up: you know the pieces, you tell check from checkmate, you pull off castling-960 even from adjacent squares. One last test remains — from me personally. I don't forgive laziness, but I respect courage. One move — and I'll sign off on your readiness.

Mate in one. The black king is locked on the eighth rank: his own pawns on f7, g7, h7 have blocked every exit — the classic trap beginners build for themselves. Your rook on a1 is staring down an empty file. Draw the conclusion and show some class.