I can mate in 7 moves!
it is mate in 1
oh sorry, it is check
I'd go for Kg8! if i was looking for the quickest mate. The idea being That Rg2+ Rf8# is impossible to stop, but only the engine knows! Kg8 Nf3 Rg2+ Kf1 Rf8 actually that's probably wrong, too many pieces that can go onto the f file.
nvm didn't notice black king in check...