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Mihai Suba vs Ildiko Madl
Zuerich op 11th (1987), Zuerich SUI, rd 4, Dec-??
Zukertort Opening: Sicilian Invitation (A04)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Nov-06-19  Amarande: And it's still not even completely obvious at the resignation!

But I'm presuming 15 ... Qa5 (e.g.) 16 Nxe7+ Kh8 17 Bd4! (threatening PxB mate, and if BxP, then BxB mate; 17 fxg7+ itself leads to fairly little after Kxg7 18 Qxa1 and White has two pieces for a Rook and the attack, but it hardly seems over) h5 18 fxg7+ Kh7 19 gxf8Q Rxf8 20 Qxa1 and Black is two pieces down is to be the conclusion.

Nov-06-19  newzild: <Amarande>
Your 16. Bd4 is a nice idea, though Black can try 16...Bh6.

The simple 16. Nxe7+ Kh8 17. fxg7+ Kxg7 18. Qxa1 is winning.

Nov-06-19  EIDorado: The line given by engine here , 1) +2.06 (21 ply) 13...Ne8 14.Nd5 Qd8 15.Nxc5 dxc5 16.Bxc5 e6 17.Ne7+ Kh8 18.f4 Nc7 19.Qd4 Na6 20.Ba3 Re8 21.Rfd1 Ba4 22.Qxd8 Raxd8 23.Rxd8 Rxd8 24.b3 Bd7 25.Rd1 b6 26.Bf3 ends up a pawn up in 13 moves. The position indicates an ending with opposite bishop colors, so this was too difficult for me.
Nov-06-19  patzer2: For today's Wednesday puzzle, I found 13. e5! Nxb3 14. exf6 Nxa1 15. fxg7 Kxg7 16. Qxa1 +- (+3.13 @ 28 ply, stockfish 10).

Stronger is the game continuation 15. Nd5! +- (+5.19 @ 34 ply, stockfish 10).

Black's decisive mistake was 12...Nc5? allowing 13. e5! +- (+5.19 @ 34 ply, Stockfish 10).

Instead, 12...b6 13. Qd4 Qb7 ± (+0.80 @ 30 ply, Stockfish 10) gives Black practical drawing chances.

Earlier, I prefer 5...cxd5 ⩲ (+0.54 @ 30 ply, Stockfish 10) over 5...Bg7 which allows 6. d5 ± (+0.92 @ 30 ply, Stockfish 10).

Nov-06-19  malt: Gone for
13.e5 Ne8 14.ed6 ed6 15.Nd5 Qd8 16.N:c5 dc5 17.B:c5 and B:f8
Nov-06-19
Premium Chessgames Member
  WorstPlayerEver: 13. e5 Ne8 rather tough for a Wednesday.
Nov-06-19  saturn2: Also took
13. e5 Ne8 (Nxb3 looses a piece) 14. Nxc5 dxc5 15. Nd5 Qd8 16. Bxc5 e6 17. Bxf8 Kxf8 exchange + pawn
Nov-06-19  King.Arthur.Brazil: I previewed the sequence of moves: 13. e5 ♘e8 14. ♘d5 ♕d8 15. exd6 exd6 16. ♘xc5 dxc5 17. ♗xc5 ♗c6 18. ♘e7+ ♔h8 19. ♘xc6 bxc6 20. ♗xf8 ♗xf8 21. ♕xd8 ♖xd8 22. ♖ad1 ±. Time to check out.

Following the moves of the game... 15...♕b8 (the lonely move, since 15...♕d8 16.dxe7 or 15...♕c8 16.♘xe7+)} 16. ♘xe7+ ♔h8 17. fxg7+ ♔xg7 18. ♕d2 (threatens ♗h6+ to win the exchange and possible net of check-mate, better than 18.♕d4+ or 18.♗d4+. Now black cannot follow with 18...♖e8 or ♖d8, because of 19.♗h6+ ♔h8 20.♕d4+. If 19...♔f6 20.♗g5+ ♔e6 21.♕d5# or 20...♔g7 21.♕d4+} and check-mate follows. 18...f6 19. ♗h6+ ♔f7 20. ♗xf8 ♔xf8 21. ♘d5 ♗f5 22. ♖xa1... with a ♘ ahead, position and still a king-side attack.

Nov-06-19
Premium Chessgames Member
  TheaN: Am a bit sloppy with 15.fxg7?! +- but still easily +3 because the Black pieces are still not good, 15.Nd5! is of course a very useful zwischenzug. Black could have avoided immediate disaster with 13....Ne8 ±, an idea that happens in the Morra where White tends to get enough control for the pawn. Here... it's just bad.
Nov-06-19
Premium Chessgames Member
  Jonathan Sarfati: 15...♕a5 16.♘xe7+ ♔h8 17.b4! (17.fxg7+ ♔xg7 18.♕xa1 is simple and good enough) 17...♕e5 18.fxg7+ ♕xg7 19.♘d5 Δ 20. ♗d4. White doesn't need to hurry to capture the ♘a1.
Nov-06-19
Premium Chessgames Member
  agb2002: The pawn on d6 is overburdened with the defense of the knight on c5 and the square e5. Therefore, 13.e5:

A) 13... dxe5 14.Nxc5 wins a knight for a pawn.

B) 13... Nxb3 14.exf6 Nxa1 (14... Bxf6 15.axb3 as in A) 15.fxg7 Kxg7 16.Qxa1 with the better game.

C) 13... Ne8 14.Nd5

C.1) 14... Qd8 15.exd6 exd6 (15... Nxb3 16.dxe7 wins decisive material) 16.Nxc5 dxc5 17.Bxc5 wins an exchange.

C.2) 14... Qb8 15.Nxc5 dxc5 16.Ne7+ Kh8 17.Qxd7 wins a piece.

D) 13... Nh5 14.g4 wins the knight on h5.

Nov-06-19  Ceri Evans: <Amarande: And it's still not even completely obvious at the resignation! But I'm presuming 15 ... Qa5 (e.g.) 16 Nxe7+ Kh8 17 Bd4! (threatening PxB mate, and if BxP, then BxB mate; 17 fxg7+ itself leads to fairly little after Kxg7 18 Qxa1 and White has two pieces for a Rook and the attack, but it hardly seems over) h5 18 fxg7+ Kh7 19 gxf8Q Rxf8 20 Qxa1 and Black is two pieces down is to be the conclusion.>

17. Bd4 gets 17... Bh6!

Stockfish likes 17. b4, but 17. Qd4 seems to play into your 17. Bd4 line with no threat of Bh6.


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Cheers,

Ceri

Nov-06-19  stacase: I didn't see everything that could follow 13.e5 but it looked like a pretty good move. I would have made it over the board.
Nov-06-19
Premium Chessgames Member
  eternaloptimist: I found 13.♙e5! but it took me ~10 minutes or so to find it. I think this puzzle should be graded at least medium instead of medium/easy. Although like <TheaN> I chose 15. ♙fxg7 (though I don’t think it deserves ?! b/c white still has a +-). <WorstPlayerEver> Yes it is rather tough for a Wednesday!
Nov-07-19  patzer2: <EIDorado> I too was wondering how White should respond to 13...Ne8.

I ran Stockfish 10 to 32 ply, and it shows White simplifying to a two Bishops versus Rook win:

( [Stockfish 10 64] 32:+3.11 13...Ne8 14.Nd5 Qd8 15.Nxc5 dxc5 16.Bxc5 e6 17.Ne7+ Kh8 18.Qd4 Qc7 19.f4 f6 20.Rad1 Rf7 21.Bb4 a5 22.Bc5 Bc6 23.Nxc6 bxc6 24.Qe3 fxe5 25.Bb6 Qb8 26.fxe5 Rxf1+ 27.Rxf1 Bxe5 28.Rf8+ Kg7 29.Rxe8 Bxh2+ 30.Kh1 Qxe8 31.Kxh2 Qe7 32.Bd4+ e5 33.Bc3 Re8 34.b3 Qh4+ 35.Kg1 Qf6 36.Bxa5 Qf5 +- (+5.81 @ 32 ply, Stockfish 10).

Nov-12-19  newzild: <Ceri Evans> After 17. Qd4 Qe5 18. fxg7+ Kxg7 White has two minor pieces for a rook, but Black can play on.

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