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Francisco Vallejo Pons vs Wynn Zaw Htun
16th BCC Open (2016), Bangkok THA, rd 7, Apr-15
Sicilian Defense: Najdorf Variation. Main Line (B99)  ·  1-0



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Kibitzer's Corner
Jan-07-18  mel gibson: I knew it was one of the knights that had to move. The computer agrees with the first few moves
but plays a stronger defense.
White is only up by one pawn.

Stockfish 8 says

19. Nxe6 (19. Nxe6
(♘d4xe6 f7xe6 f6-f7+ ♔e8-d8 ♖g1-g8 ♖h8-h6 ♕f3-g3 ♔d8-e7 ♕g3-h4+ ♔e7xf7 ♕h4-g5 ♖h6-f6 ♗f1-e2 ♔f7-e7 e4-e5 d6xe5 ♖g8-h8 e5-e4 ♖h8-h7+ ♔e7-d8 ♖h7xd7+ ♔d8xd7 ♕g5xf6 ♗f8-e7 ♕f6-d4+ ♕c7-d6 ♕d4xe4 ♗c8-b7 ♕e4-e3 ♔d7-c7 ♔c1-b1 ♖b8-f8 ♖e1-d1 ♕d6-c5 ♕e3xe6 ♖f8-d8 ♘c3-e4 ♖d8xd1+ ♗e2xd1 ♗b7xe4 ♕e6xe4 ♗e7-f6 c2-c3 ♕c5-e7 ♕e4-a8 ♕e7-d6 ♕a8-a7+ ♔c7-d8 ♗d1-c2 ♕d6-e6 ♕a7-b8+ ♔d8-d7 ♕b8-b7+ ♔d7-d8 a3-a4 ♗f6-e5 a4xb5 a6xb5 ♕b7xb5 ♗e5xh2 ♕b5xh5 ♗h2-e5 ♕h5-d1+ ♔d8-c7) +1.12/34 174)

score for White +1.12 depth 34 174 seconds.

Jan-07-18  mel gibson: I tested it.
Black fell down in defense with move
Black should have played 20...Kd8.

20. f7+
Ke7 21. Rg6 (21. Rg6 (♖g1-g6 ♘d7-e5 ♕f3-f6+ ♔e7-d7 ♕f6xe6+ ♔d7-c6 ♕e6xe5 ♖h8-h6 ♕e5-d5+ ♔c6-b6 ♕d5-d2 ♕c7xf7 ♖g6xh6 ♗f8xh6 ♕d2xh6 ♕f7-f2 ♕h6xd6+ ♔b6-a7 ♖e1-d1 ♖b8-b7 ♗f1-e2 ♖b7-d7 ♕d6-e5 ♖d7xd1+ ♔c1xd1 h5-h4 a3-a4 b5-b4 ♕e5-c7+ ♗c8-b7 ♘c3-d5 ♕f2-d4+ ♗e2-d3 b4-b3 a4-a5 h4-h3 ♔d1-d2 ♕d4-f2+ ♔d2-c3 b3xc2 ♗d3xc2 ♕f2-g1 ♔c3-b3 ♕g1-d4 ♘d5-b4) +7.08/32 100)

score for White +7.08 depth 32, 100 seconds.

Premium Chessgames Member
  al wazir: The first move was easy.

I think my idea for the continuation was pretty cute: 20. Rg8!, and if 20...Rxg8, then 21. f7+ Kd8/Ke7 22. fxg8=Q. Or 20...Rh7 21. Nd5 exd5 22. exd5+ Kd8 (22...Kf7 23. Qg3) 23. Qe4 Ne5 (23...Nxf6 24. Rxf8+ Kd7 25. Qe6#) 24. Rxf8+ Kd7 25. Qxh7+.

But after 19. Nxe6 fxe6 20. Rg8 Rh7 21. Nd5 exd5 22. exd5+ Ne5 it doesn't seem to go anywhere.

Premium Chessgames Member
  An Englishman: Good Evening: Guess this counts as solving the puzzle--picked the same variation that Stockfish chose in <mel gibson's> analysis. 6/7 for the week; too bad Saturday got so badly butchered.
Jan-07-18  patzer2: For today's Sunday puzzle (19. ?), I correctly guessed the first two moves with 19. Nxe6! fxe6 20. f7+ Ke7.

But I failed to pick the strong winning follow-up 21. Rg6! +- (+7.20 @ 29 ply, Stockfish 8) because I thought Black could hold after 21...Rh7 (diagram below).

click for larger view

However, I was wrong. After 21...Rh7 (diagram above), White wins with 22. Nd5+! due to the clever mate-in-two threat 22...exd5? 23. Re6+! Kxe6 (23...Kd8 24. Re8#) 24. exd5#.

Instead of 20...Ke7 21. Rg6! +- (+7.20 @ 29 ply, Stockfish 8), Black could have put up more resistance with 20...Kd8, when White maintains a difficult advantage after 20...Kd8 21. Rg1 Rh6 22. Qg3 Ke7 23. Qh4+ Kxf7 24. Qg5 Rf6 25. Be2 Ke7 26. e5 dxe5 27. Rg6 Bb7 28. Rf1 Kd6 29. Rfxf6+ Nxf6 30. Rxf6 Qg7 31. Rg6 Qf7 32. Kb1 Qf4 33. Qg1 Qd4 34. Qf1 Qf4 35. Qh3 Qf7 36. Rg1 Kc7 37. Rf1 Qe8 38. Bxh5 Qd7 39. Bf7 Rd8 40. Bxe6 Qd4 41. Rd1 Qc5 42. Rxd8 Kxd8 43. Qh7 Bc6 44. Qg8 a5 45. Nd5 Bxd5 46. Bxd5 Kc7 +- (+1.70 @ 34 ply, Stockfish 8)

P.S.: Black's game starts to go bad after 17...Rb8 allowing 18. Re1 ± (+1.11 @ 28 ply, Stockfish 8). Instead, 17...Qb6 18. Kb1 b4 19. axb4 Qxb4 20. e5 Bb7 21. Qf2 0-0-0 22. Nf3 ⩲ (+0.52 @ 33 ply, Stockfish 8) gives the second player active counter chances.

For a possible improvement in this Sicilian Najdorf opening line, instead of 13...Nc5 potentially allowing 14. Rg1 ⩲ (+0.57 @ 30 ply, Stockfish 8), I prefer 13...0-0 = (+0.16 @ 32 ply, Stockfish 8) as in Black's win in D Shailesh vs D Eggleston, 2017.

Jan-07-18  morfishine: Saw <19.Nxe6> & <20.f7+> but not the subsequent rook sac on <e6> (which I assume is the insane move)


Jan-07-18  malt: Gone for
19.N:e6 fe6 20.f7+ Ke7 21.Nd5+ ed5
22.ed5+ Ne5 23.Rg6! [Threat of Qf6+]
(23.R:e5? goes nowhere)
23...Kd7 24.R:e5 de5 25.Qf5+ Kd8 26.Qf6+ Qe7 27.Q:h8 Bg4 (27...Q:f7 28.Rf6 )26.d6
Jan-07-18  jayfreeman: Very good tactics from white, but poor defense from black again.
Jan-07-18  agb2002: White has a bishop and a knight for the bishop pair.

White gas a number of aggressive moves Nd5, Nf5, Ncxb5, Ndxb5, Bxb5, Nxe6, Bh3, etc.

The sac 19.Nd5 exd5 20.exd5+ Ne5 seems to go nowhere.

The idea 19.Nxe6 fxe6 20.Rg8 Rxg8 21.f7+ is met with 20... Rh7.

Another option is 20.f7+ followed by 21.Rg8 but I've been unable to make it work clearly. Perhaps combined with a well timed Nd5 to open the e-file and/or deflect the black knight from f8.

Jan-07-18  Cheapo by the Dozen: I was thinking Rg8 rather than Rg6/Rxe6+.

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