Some notes on the game.

*** Part 1 ***
Interesting opening, kind of a cross between declined versions of Lisitsyn Gambit (Opening Explorer) and Latvian Gambit (Opening Explorer).

4. g3 - a solid approach. Curiously, half a century later Carlsen vs Dolmatov, 2004 reached the same position after the initial three moves. Magnus continued with the incisive <4. Nc3 Nc6 5. ef5 Bf5 6. d4> which led to a rapid debacle for Black. I don't subscribe to the idea that that game refutes <1. Nf3 f5> once and for all (Black's play was too cooperative to be on GM level), but it sure highlights the pitfalls facing Black.

9...f4 - initiates a typical Dutch/KID-style kingside attack. White should probably retreat the Bishop at once, rather than fall in with Black's plans.

12. Ne2?! - having said "Ah", White might as follow up with "Bee" and take the pawn <12. Bxf4>. He was probably afraid of the tactical complications starting with <12...Nxe4> but White holds his own after <13. Nd5> Δ 14. Nxc7 <13...Nc5> (bad is <<13...Rxf4 14. Nxf4 >> and the initiative is firmly with the first player) <14. d4 Ne6 15. Bg3 Bd8 16. Re1 Qh5 17. c4= > with a nicer position than what he actually got in the game:

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<<13. dxe4 Rxf4 14. Nd5 Rf8 15. Nxc7>>, threatening to win the exchange, also looked interesting. Counterattack <<15...Qg6>> seems to be Black's best course, and now <<16. Kh1= >> for the prudent and <<16. Nxa8>> for the adventurous. After <<16...Bxh3 17. Ne1 Bxg2 18. Nxg2 Ne5 19. f4 Ng4 20. Qf3 Qh5>> Black's attack balances out his material disadvantage, according to Stockfish.

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12...Nh5 - Korchnoi could have taken advantage his opponent's pussy play and secured the initiative by the sharper <12...g5>. Whether White likes it or not, he is forced into complications <13. Nxg5 Rg8 14. h4 Nh5 15. Bc3+ Ne5> and now, in order to stay in the game, he would have to find <16. Ng3! > as after <16. d4 Nb3 17. d5+ Ne5 > Black's kingside attack flows unchecked:

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14. Nxf4? - having tucked his King away from the half-open g-file, White decides it's safe to grab the f-pawn at last and loses the exchange. It would be better to reroute the errant Knight to d5 and give up a pawn trying to contest the initiative : <14. Nc3 Qf7 15. Nd4 Bxb2 16. Rb1 Bf6 17. Re1 >

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17...Qh5 - Black maneuvers with tempo his Queen to the a1-h8 diagonal to forestall White's attempt to organize some pressure along it.

20. Qc1 - White has to abandon the long dark diagonal as he naturally doesn't want to exchange Queens. <20. Qa1> would be met by <20...Qd4>.

21. f4 - White reluctantly embarks on a kingside attack. Too bad his dark-squared Bishop is facing the *queenside*.

22...Be6 - Stockfish prefers <22...Bd7> Δ 23...Rae8, so as not to block the e-file.

23...Bxa2?! - instead of increasing his material advantage Black should think about securing his position.

24. e5!= - White goes onto attack.

24...Nc6 - a somewhat belated retreat.

25. e6? - the wrong pawn! <25. f6!> would crack the black King's defence perimeter with all black pieces stuck on the queenside: <25...Nxe5 26. fxg7+ Kxg7 27. Rf5 Rf7 28. Bxe5+ dxe5 29. Qg5+ Kf8 30.Rxf7+ Kxf7>

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and now White could go for perpetual with <31. Qxh5+> or try for more with <31. Nf5>.

25...a5 - with f6 no longer much of a threat Black ignores the opponent's kingside machinations and starts pushing his passed a-pawn.

27. Rf4? - with a view to possible transfer to the h-file after Ng6+, as well as keeping an eye on the enemy passer. However, <27. Re2> is more prudent, doesn't block the g3 Bishop and adds an extra threat of e7. After <27. Re2 Qf6> (otherwise <<28. Ng6+>> is devastating) <28. Qh5 Kg8 29. Bf4> (not possible with the Rook on f4) Black would be rather busy parrying the onslaught. Stockfish considers the drastic <29...Bxe6> the best way for Black to break the ring tightening around his King and keep his advantage. A simple plan is to exchange a few of the attacking pieces off and get back to passer pushing: <30. Rxe6 Qf7 31. Qxf7+ Kf7 32. Bd2 Rae8 33. Bd5 Rxe6 34. Bxe6+ Ke7 35. Bg5+ Ke8 36. Be3 b5 >

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but at least it would be a fight. Instead White goes after the mirage along the h-file.

27...Qf6 - the threat of Ng6+ can no longer be ignored.

30. Qg4? - White twitches and sounds a retreat. The ...Bxe6 threat is best met with <30. Be1>, planning to include the Bishop in the attack with tempo by transferring it to either the a1-h8 or the c1-h6 diagonal. This would force Black to part with some material to prevent White from turning tables on him. Although the position after <30...Rc5 31. c4 Bxc4! 32. dxc4 a3> (luring the white Queen away) <33. Qe2 g5! 34. Rf3 a2 35. Qxa2 Qe5+ 36. Bg3 Qxe4 37. Qb2+ Kg8 38. f6 Qxe6! 39. fxe7 Qxe7 40. Rxf8 Qxf8 41. Ng2>

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30...a3 - this pawn blatantly mocks White and encourages him to short-circuit.

31. Ng6+ - desperately plunging ahead with the attack. White's position was clearly lost, but he could have at least tried to include the Bishop in the banzai charge.

32...Bxe6! - Black doesn't need this Queen anymore, he will shortly have another one.

36. Bh4 - with Stockfish evaluating the position as -7.50 it's a moot whether this move deserves a question mark. Still, it would make more sense to try to give up the Bishop for the a-pawn with <36. Be1 a2 37. Bc3>, at least in terms of prolonging the game the most. Instead, White clings to the fading illusion of an attack and the eval gradually drops down to -54.15 in the final position.

40... Ra8 - apparently both players were in severe time trouble and missed a mate in 6: <40...a1Q 41. h4 Qd4 42. Kg2 Ra2 43. Bf5 Rxc2+ 44. Kg3 Bxf5 45. Qxg8 Qf2#>

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It doesn't matter, though, as White presumably lost on time.