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It was not so much the e-pawn White overlooked, but the loose bishop on e3 which made Black's next move good.

Right.

Quite. The idea is to make life hard for the enemy, however difficult your own situation has become. There are a lot of pieces 'en prise' right now...

He could actually win your free bishop on c4, if Qxc4 is played.

But then I take his bishop on b4 with Nxb4.

There are occasions where it is ok to have two pawns on one file, but I am not at all crazy about this, under any circumstance. It is generally ?.

Nervous play, but the g2-square had to be defended. The available options aren't many. Maybe 20.Qd2 is the best of a very unattractive range. To jkarp: he is actually talking of doubling rooks on the f-file. This is to look ahead, of course, as much in hope as in expectation.

Now, you are forced to retreat the rook.

If you had play 20.Bd3, you would have immediately lost the bishop. If you had then recaptured the bishop with your queen, you would have also lost that queen.

Actually, had White tried 20.Bd3, then this would have happened: 20.Bd3 Ng4! and if then 21.Bxe4 Nxf2ch 22.Kg1 Nxd1ch 23.Kf1 Bxe4 and Black emerges a clear rook and minor piece ahead. White would have had to look for other defences: [A] 24.Re2 Qxg2ch!? (spectacular, but this might not be best) 25.Rxg2 Nf2ch (the rook is now pinned) 26.Kg1 Nxd1ch 27.Kf1 ... (not 27.Kh1 Nf2ch) 27...Bxg2ch 28.Kxg2 Ne3ch and Black is up a rook; OR [B] 24.Rf3 Qxf3 [B1] 25.gxf3 Nf2ch 26.Kg2 Nxd1 27.Rxd1 Bc6; [B2] 25.Qxf3 Bxf3 26.gxf3 Nf2ch etc.

During the game I had a vague notion that l-d-j had a pretty good idea what was coming, but played this either as a sporting form of resignation, or simply in the hope that maybe I would miss (or mess up) the winning attack.

Of course I had a feeling that I was neglecting the defence of my own king, but I thought it was hopeless anyway so I'll take as much material as I can and if there's no immediate mate, I might get into a holdable endgame.

This is called a, "Deflective Sacrifice". I recently learned this from hityerclock in a different annotation.

But I don't miss this sort of thing very often.

You did well in the first two-thirds of this game, and it might well have turned into something exciting and dramatic but for that oversight. Looking forward to a rematch.

This is an interesting game that you played against Craig. You generally learn more when you play against a high rated player, like Ion. I learned this from experience against masters, as well (-chess- and adivela).