For [@loopywalt's answer](https://puzzling.stackexchange.com/a/120365/11110) to the Puzzling.SE question "The Biggest Chess Blunder":

    [FEN "Rrrqqqqq/PPPPPPP1/kq1qqqbb/7R/K7/4n3/8/8 b - - 0 1"]

    1... Ng4 (1... Bc2#) 2.axb8=Q+ Qa7 3.Rxa7+ Kb6 4.bxc8=Q+ Kc6 5.cxd8=Q+ Qc7 6. Rxc7+ Kd6 7. dxe8=Q+ Qd7+ 8. Rxd7+ Ke6 9. exf8=Q+ Qe7 10.Rxe7+ Kf6 11. fxg8=Q+ Bf7 12. Rxf7+ Kg6 13. Qxg4+ Bg5 14. Rxg5+ Kh6 15.gxh8=Q#