abcdefgh87654321
1.e4 c5 2.Nf3 Nc6 3.Nc3 e6 4.d4 cxd4 5.Nxd4 Qc7 6.g3 Nf6 7.Ndb5 Qb8 8.Bf4 Ne5 9.Bxe5 Qxe5 10.f4 Qc5 11.e5 Qc6 12.exf6 Qxh1 13.Qd4 Qxh2 14.Ne4 gxf6 15.Qxf6 d5 16.O-O-O Rb8 17.Qxh8 dxe4 18.Rd8+ Kxd8 19.Qxf8+ Kd7 20.Qd6+ Ke8 21.Nc7#