Since... 1994!

The 'tempo' makes the difference

White have a mate in 2 moves , but it is black's move. What's black's spectacular manouver that lead them to the win?

(White: Kb1, Qh4, Rh1, Ng3, Nh2, Be4, Bf6, a2, b2, c2, d3, e5. Black: Kh7, Qc7, Re3, Rg8, Na4, Ne6, Bh6, a7, d7, f7, g6.)