A Correspondence Chess Win by Resignation

But, why?

I’ll happily take my victories however they come, but this is one that has me scratching my head. If Black had offered me a draw at this point in our highly constipated endgame, I’d have seriously considered accepting that. Instead, he resigned a few days ago, after about two months of play in this server-based correspondence chess game, giving me the win with White by default.

The position of pieces at game’s end and our full move record:

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1.Nf3 c5 2.c4 e6 3.e4 a6 4.e5 d6 5.Nc3 dxe5 6.Nxe5 Nf6 7.g3 Qc7 8.Ng4 Nxg4 9.Qxg4 Qe5+ 10.Qe4 Nc6 11.Bg2 Qxe4+ 12.Bxe4 Bd7 13.O-O f5 14.Bg2 O-O-O 15.d3 h6 16.Na4 e5 17.b3 Kc7 18.Bb2 Nd4 19.Rae1 Bxa4 20.bxa4 Bd6 21.Bxd4 cxd4 22.Rb1
1-0