GM Overlooks Back Rank Mate

Michael O'Connor [pictured, third from left] sends this on-line game which Joe Salvatore [pictured, fourth from left] won against a grandmaster.

Colle System

Kosanovic (2289) - JoJo61 (1536) [D05] Rated game, 3 min Main Playing Hall, 26.03.2020 

1.d4 Nf6 2.Nf3 d5 3.e3 e6 4.Nbd2 Bd6 5.Bd3 O-O 6.O-O c6 7.b3 Nbd7 8.Bb2 b5 9.c4 bxc4 10.bxc4 Ba6 11.Qc2 Rb8 

12.Rfb1 Bc7 13.Ne5 Nxe5 14.dxe5 Ne4 15.Nxe4 dxe4 16.Bxe4 g6 17.Bxc6 Qg5 18.f4 Qg4 19.Bf3 Qh4 20.Bd4 Rxb1+ 21.Rxb1 Rb8

22.Rb3 Bb6 23.c5 Qe1#.