I agree: I think - or at least I thought - this was the turning point of the game. Looking at the thing more thoroughly, though, one comes to appreciate just how strong White's attack has become. I can't find anything better than the suggested 22...Nce5 (the check from b6 does nothing useful) 23.Bh5! with these possible lines: [A] 23...g6 24.Rdf2! (24.Qf4 gxh5 25.Bxe5 Nxe5 26.Nf6 looks huge, but may be good for no more than a draw. But now the threat is 25.Rxf7 at once, so: 24...Qd5 (what else?) 25.Bxe5 and now [AA] 25...Qxe5 26.Nf6ch! or [AB] 25...Qxe4 26.Re2 with huge attacks either way; [B] 23...Rf8 (not a move that springs immediately to mind...) 24.Bxf8 Kxf8 (24...Nxf8 is met by the same response...) 25.Bxf7 Nxf7 26.Rdf2 Qb6ch 27.Kh1 and White has a winning attack. It seems that, contrary to the GKE analysis, White was probably already on top - provided, with best defence, he could find the best attack!

(!) Very good move. I was looking at 23.Rf6, which I feel sure is good enough at least to draw, but, with the right follow-up, this Bishop move turns out to be a killer. Much better.

Good: very good, even; but deadlier still was this ferocious move 24.Rxd7!! A real Tal move, this one, and it leaves Black busted (though the following analysis is very complicated!): 24.Rxd7!! ... and now [A] 24... Qxd7 25.Be5!! (the obvious 25.Nf6ch also wins, but this bishop leaves Black with no defence) 25...g6 26.Nf6ch Kf8 27.Nxd7ch Bxd7 28.Qxg6 and mate is looming; [B] 24...Bxd7 25.Be5 g6 (say - this is just a sample line; if 25...g5 26.Nxg6) 26.Rxf7!! (A double rook sac! One for the bucket list, alongside Queen sacs) 26...Kxf7 (26...Nxf7 27.Qxg8ch Kf8 28.Qg7ch Ke7 29.Nf6ch or 26...Qxe4 27.Rg7ch Kh8 {...Kf8; Qf2ch etc} 28.Rxg6ch Kh7 29.Rxh6ch! Kxh6 30.Qg7#) 27.Qf4 Kg8 28.Qxh6 and Black can avert immediate mate only by 28...Qa1ch 29.Bxa1 e5 30.Bc4ch etc.; [C] 24...Qxe4 25.Bd3! (Better than 25.Be5? which allows Black to escape by 25...Qxe5! But now, if, say, 25.(Bd3) Qb4 26.Be5 is crushing. Black is probably best advised then to play 25.(Bd3) Qe3ch! 26.Qxe3 Bxd7, though R-and-3 isn't enough for the Queen - not with white still hot on attack.

That might depend on whether White intended to take with the Rook or the Knight. The former would have allowed Black some counterplay by (25...Rxd8) 26.Rxf7 Qa1ch 27.Rd1 Qe5 though the attack after 28.Qg6 looks pretty strong. After 26.Nxf7 Rf8 27.Qg6 Black can not keep White out for long.

Although 29.Nxf7 is probably unobjectionable in this line (following on from 25...Qb4), I think I would have subjected 29.Qxf7ch to a very close scrutiny. So: 25...Qb4!? 26.Rd3 Qc5ch 27.Kh1 Qe5 (27...Rxd8!?) 28.Qf3 Rxd8 29.Qxf7ch Kh8 (29...Kh7 30.Rg3, threatening 31.Bd3ch) 30.Qe7 (threatening a family check). Now if 30...Qxe2 31.Nf7ch Kg8 (31...Kh7 32.Ng5ch Kg8 33.Qf7ch Kxg5 34.Qxg7ch Kh5 35.Rh3#) 32.Qxd8ch Nf8 33.Nxh6ch Kh7 34.Qxf8 Bd7 35.Qf7 and White wins easily.

I agree 26.Rxf7 would have been less good, but White still would have kept most of his advantage thereby (see comment to White's 25th, but I'll repeat the gist here: 27.Rxf7?! Qa1ch 28.Rd1 Qe5 29.Qg6 with heavy pressure against Black's castled king.

They both lead to a quick mate.

After that line, 31...Qxe8 takes your queen.

no... the knight would still be at d7 and the rook would therefore not be protected

Very nice game! I think if you need to learn a lot of openings though, this may not be the best variation to choose. It's very theoretical and usually the player with the best knowledge of opening theory wins. However, if you can follow the DB, it's not a big problem.

great game 

A fine game, and a well-executed attack. I rather think that Black's losing move came earlier than you inferred from the course of the game, probably his 22nd, as 23.Bc7 led to a big advantage for White. The Poisoned Pawn Variation is a knife-edged line for Black: one slip, and it's headlong into the crocodile pit.