Blunder!

MY Benidorm U2000 round-two game had an abrupt finish.

Black to make his 42nd move in Spanton (1940) - Bart De Vogeleare (1794)

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I have manoeuvred my king from g1 to a2 and am about to snaffle Black's passed pawn.
However, Black seems to be more-or-less OK after the counterattacking 42...Bg6, although his d5 pawn would remain a target.
42...Qf5??
This looks aggressive, but ignores the fact there are still mating threats when queens remain on the board.
43.Qf8+ Bg8 44.Be6 1-0