|KEG: Post III
After Tchigorin's 29...Rf8, the position was as follows:
click for larger view
Marco, down a pawn, found an interesting way to continue his attack.
30. RxB! NxR
Better than 30...RxR, which--contrary to Rosenthal--does not lose. After 30...RxR 31. Bxf6 Tchigorin would have been OK after 31...Qe1+ (rather than Rosenthal's awful 31...Rf8?, which does indeed lose to 32. Ng4. But 30...RxR leads only to equality for Black, while the text allows Tchigorin to retain winning chances.
31. Nhf5 BxN
32. NxB Ne6
Parrying Marco's mating threat. The position was now:
click for larger view
Marco here had an interesting chance with 33. Nxh6+, after which he would have more than a fighting chance: e.g., 33. Nxh6+ Kh8 34. Nf7+ RxN 35. QxR QxB 36. QxN (36. Qe8+ is also possible after 36...Kh7 37. QxN [and not Rosenthal's awful 37. Qg6+? Kg8 which loses]) Qc1+ 37. Kh2 Qxc5 and White, though down a pawn, has chances in the Queen ending.
Instead, Marco played the far inferior:
This protects the Bishop, but gives Tchigorin the chance to defend everything.
34. Be3 Qd7
Now Marco is down the exchange and Tchigorin is able to defend everything. But Marco is not quite done yet.
35. Bxh6 Qf7
Since the exchange of Queens would end Marco's attack, he is forced to retreat.
36. Qg4 Kh7
37. Be3 Ng5
38. Nd6 Qe6
39. Qb4 Nf7
A momentary lapse by Tchigorin, who has been defending brilliantly for the last ten moves. Better was 39...Qe7, defending the b7 pawn, which Marco could now grab.
Marco should have snatched the b7 pawn with 40. Qxb7. Marco may well now be lost.
Marco had to play 41. Qxb7 here. Now the game is gone. (Needless to say, and as Rosenthal points out in the Tournament Book, 41. Nxb7? loses immediately to 41...Rb8)
Good enough, but 41...Rd8 was even more crushing.
If Marco wanted to continue, he had to go for broke with 42. h6
43. h6 was still the best chance, but Marco is lost now.
Hopeless. 44. h6 was the only (albeit tiny) chance.
The party's over!
45. Kg1 Qe2
Good enough, but 45...Nxf2! was prettier and faster. I am surprised Tchigorin missed this.
46. Be3 NxB
46... Ra3 was faster.
47. NxN Ra2
47...Qxh5 was immediately decisive. The text, obviously, also wins easily.
48. Qf5 Qe1+
As Rosenthal correctly notes, 49. Nf1 is "better," but by now it hardly matters. After the text, Tchigorin is up a Rook, and all he has to do is extricate his King from the spite checks by Marco's Queen.
50. Qc8+ Kh7
51. Qf5+ Kg8
52. Qc8+ Kf7
53. Qxb7+ Kf8
54. Qc8+ Qe8
Now the checks are at an end and Marco can resign.
Equivalent to resignation.