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Lawrence Day vs Atanas Kafadarow
St. Jean Class (1976), Quebec, rd 2
King's Indian Attack: Symmetrical Defense (A05)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jun-23-22  Brenin: The P on g5 is Black's weak point, so remove a guard with 29 Rxe4 dxe4 (otherwise a piece is lost) 30 fxg5+, e.g. 30 ... fxg5 31 Rxf7 exd3 32 Rf6+ Kxh5 (32 ... Kg7 33 Qxg5+ Kh8 34 Rf7 Rg8 35 Qf6+ with mate to follow) 33 Qe1+ g4 34 Qh1+ Kg5 35 Qh6 mate. Alternatively 30 ... Kxh5 31 Nf4+ Kxg5 (Kg4 32 Nxe6 with mate) 32 Rh1 with mate to follow.
Jun-23-22  mel gibson: Fairly obvious today.

Stockfish 15 says:

29. Rxe4

(29. Rxe4 (♖e1xe4 g5-g4 f4-f5+ ♔h6-g7 f5xe6
d5xe4 e6xf7 ♔g7xf7 ♘d3-e5+ ♔f7-e7 ♘e5xg4 ♔e7-d8 ♕d2-f4 e4-e3 ♘g4xe3 a7-a5 ♘e3-d5 ♕b6-c6 ♕f4xf6+ ♕c6xf6 ♘d5xf6 ♖e8-h8 ♖f1-f5 ♔d8-e7 g3-g4 ♔e7-e6 ♘f6-d5 ♔e6-d6 ♔g2-f3 ♖h8-e8 ♘d5-f6 ♖e8-e1 ♔f3-f2 ♖e1-a1 ♖f5xb5 ♔d6-c6 ♖b5-b3 ♖a1-c1 g4-g5 a5-a4 ♖b3-b4 ♔c6-d6 ♔f2-e3 ♖c1-e1+ ♔e3-d3 ♔d6-e6 ♖b4-b6+ ♔e6-f5 ♖b6-b5+ ♔f5-f4 ♔d3-c4 ♖e1-c1 ♔c4-b4 ♖c1-g1 h5-h6 ♖g1xg5 ♖b5xg5 ♔f4xg5) +11.58/36 249)

score for White +11.58 depth 36.

Jun-23-22
Premium Chessgames Member
  ChessHigherCat: That was tweasy for a Thursday, too. You have to get rid of the obnoxious knight and then pxp+ and the rest plays itself.
Jun-23-22
Premium Chessgames Member
  al wazir: I went with 29. fxg5+ Nxg5 (29...fxg5 30. Rxf7 Nxd2 31. Ne5 Qd8 32. Rh1 Ne4, and now 33. Ng4# is unstoppable) 30. Ne5 Rff8 31. Ng4+ Kg7 32. h6+ Kh8 33. Rxf6 Rxf6 34. Nxf6. White is a piece up.

But neither line looks forced.

Jun-23-22
Premium Chessgames Member
  An Englishman: Good Evening: Not too hard, but still a nice combination, Mr. Day!
Jun-23-22  Brenin: <al wazir>: 29 fxg5+ fxg5 30 Rxf7 Nxd2 31 Ne5 Nc4 stops White's attack, e.g. 32 g4 Nxe5 33 dxe5 (33 Rxe5 Qd8) Qb8 34 Ref1 Qxe5 35 R1f6+ Qxf6+ 36 Rxf6+ Kg7 and Black is a P ahead in the K+R endgame.
Jun-23-22  TheaN: <al wazir: I went with 29. fxg5+ Nxg5>

I actually did too, and not sure why I got so stumped on 29.Rxe4. I couldn't make 29....fxe4 30.fxg5+ Kg7 work, though now placing the knight on e5 is very obvious, thus take out the defender (gxf6+) with Ne5 is key.

Inclined to say <29.fxg5+?! ±<>> wins, but not as clean. <29....fxg5!> is key, as Nxg5 30.Ne5! Rff8? (everything loses though) 31.Rxf6+!! Rxf6 32.Ng4+ Kxh5 33.Ne5! #6. <30.Qe2!> Rxf7? actually fails after Nxd2 31.Ne5 Nc5! ∓. <30....Ref8> due to Rf2+, White's kind of forced to take the f-file with <31.Rxf7 Rxf7 32.Rf1 Rxf1 33.Qxf1 ±>, reducing material but having no weaknesses:


click for larger view

Definitely better for White, but far from won.

Jun-23-22
Premium Chessgames Member
  parch: Went for 29.R:e4 de4 30.fg5+ Kg7

(30...K:h5 31.Nf4+ K:g5 32.Rh1 Kf5 33.Rh5+ Kg4 34.Qe2# ) 31.gf6+ Kh8

(31...R:f6 32.Qg5+ )

35.Ne5 with a winning position.

Jun-23-22  Cellist: I also considered 29. fxg5+ for a while but was not so convinced that it was winning after 29. ... fxg5 (not Nxg5? or Kxh5??). The engine gives it just a +1.44. I then saw that removing the N on e4 and then fxg5+ opened up a lot of possibilities for attack. I calculated only up to 32. Ne5, but I was fairly sure this would be winning clearly.
Jun-23-22
Premium Chessgames Member
  chrisowen: Ouch it was led Rxe4 abridge axled go plug abind coffin I clungback idiom eh c banal black da ghosted affect Rxe4 ear;
Jun-23-22
Premium Chessgames Member
  chrisowen: It was key!
Jun-23-22  MrKing43: After 29 Ne5, what is black's reply ?
Jun-23-22  MrKing43: Stupid question. N takes Queen
Jun-23-22  AlicesKnight: Found 29.Rxe4 and the main line. Black must lose out heavily.
Jun-23-22
Premium Chessgames Member
  agb2002: Black threatens Nxd2.

The black knight protects g5. This suggests 29.Rxe4 dxe4 30.fxg5+:

A) 30... Kg7 31.gxf6+

A.1) 31... Rxf6 32.Qg5+ Rg6 (else 33.Qxf6+ Kg8 34.Qf7+ Kh8 35.Qxe8+ Kg7 36.Qf8#) 33.hxg3 Qd8 (33... exd3 34.gxh7+ Kh8 [34... Kxh7 35.Rh8#] 35.Qf6+ Kxh7 36.Rh8+ Kg8 37.Rh8#) 34.Rf7+ Kg(h)8 35.Qh6 and mate next.

A.2) 31... Kf8 32.Qh6+ Kg8 33.Ne5 (33.Rf4 exd3 34.Rg4+ Kh8 35.Rg7 Qb7+ 36.Kg1 Rxg7), followed by Rf4, looks winning. For example, 33... Qb7 34.Rf4 Ref8 35.Rg4+ Kh8 36.Ng6+ Kg8 37.Nxf8+.

A.3) 31... Kg8 32.Qg5+ Kh8 (32... Kf8 33.Qh6+ transposes to A.2) 33.Ne5 looks similar to A.2. For example, 33... Qb7 (33... Rc7 34.f7 Rf8 35.Qf6#) 34.Nxf7+ Qxb7 35.h6 Rg8 (35... Qg6 36.f7 Rf8 37.Qe5+ and mate next) 36.Qg7+ Rxg7 37.fxg7+ Kg8 38.Rxf7 Kxf7 39.Kf2 with an elementary win.

A.4) 31... Kh8 32.Ne5, again looks similar to previous lines. For example, 32... Rff8 33.f7 Rd8 34.Qh6, with the threat Ng6#, wins.

B) 30... Kxh5 31.Nf4+ Kxg5 (31... Kg4 32.Qe2+ Kf(g)5 33.Qh5#) 32.Nxd5+ wins decisive material.

C) 30... fxg5 31.Rxf7 exd3 (else drop a piece) 32.Rf6+ Kg7 (32... Kxh5 33.Rh1+ Kg4 34.Qe2#) 33.Qxg5+ Kh8 34.Rf7 Rg8 35.Qf6+ Rg6 36.Qxg7#.

Jun-23-22  Brenin: <agb2002>: In your line (B), 32 Nxd5+ certainly wins the Q, but 32 Rh1 leads to mate in 2, e.g. 32 ... e3 33 Rh5+ Kg4 34 Qe2, or 32 ... f5 33 Nh3+ K anywhere 34 Qg5.
Jun-24-22
Premium Chessgames Member
  agb2002: <Brenin: <agb2002>: In your line (B), 32 Nxd5+ certainly wins the Q, but 32 Rh1 leads to mate in 2, e.g. 32 ... e3 33 Rh5+ Kg4 34 Qe2, or 32 ... f5 33 Nh3+ K anywhere 34 Qg5.>

Thank you! 32.Nxd5+ is so crushing that I didn't look for something better.

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