A Fischer Random Chess win by Knight-Rook-Queen-pawn Combination Checkmate

This server-based Fischer Random correspondence chess game began in mid-March and ended yesterday when my 30…Nc4# caught the White King in a combination checkmate involving four pieces: the attacking Knight, and my Queen, Rook, and b5-pawn covering all possible flight squares.

The opening board we were assigned, our complete move record, and position of pieces at game’s end:

ErvsRO-a

1.g4 g5 2.Nf3 h6 3.Nc3 b6 4.Nb5 Nc6 5.Qh3 Qg7 6.Qg3 e5 7.b4 Re6 8.h4 f6 9.hxg5 hxg5 10.a4 a5 11.bxa5 Nxa5 12.Bg2 Ne7 13.Na7+ Kd8 14.Rb5 Rb7 15.Nc6+ dxc6 16.Rb4 Nd5 17.Re4 b5 18.axb5 cxb5 19.Nxe5 Nf4 20.Rd4+ Kc8 21.Bxb7+ Bxb7 22.Nd3 Nxe2+ 23.Rxe2 Rxe2 24.Rb4 Qd7 25.Nc5 Qxd2+ 26.Kb2 Qxb4+ 27.Nb3 f5+ 28.Kb1 Qe1+ 29.Ka2 Rxc2+ 30.Ka3 Nc4#
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ErvsRo-b