abcdefgh87654321
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bd2 b6 5.Nf3 Bb7 6.Qc2 O-O 7.Bg5 Be7 8.e4 d5 9.Bxf6 Bxf6 10.cxd5 exd5 11.e5 Be7 12.O-O-O c5 13.Bd3 h6 14.Bf5 Kh8 15.e6 fxe6 16.Bxe6 Rf6 17.Ne5 Na6 18.Ng6+ Kh7 19.Nf8+ Kh8 20.Qh7#