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Mads Boe vs Baadur Jobava
European Club Cup (2007), Kemer TUR, rd 1, Oct-03
Sicilian Defense: Alapin Variation. Smith-Morra Declined (B22)  ·  0-1

ANALYSIS [x]

FEN COPIED

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sac: 15...Nxd3 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Oct-04-07  Deceptor: It seems so easy to beat a 2339 player when you see games like this, doesn't it?
Oct-04-07  Resignation Trap: 10...g5 combined with 11...h5 looks primitive, but it works well here.
Nov-19-17  bcokugras: 16. Qxd3 seems better.
Nov-19-17
Premium Chessgames Member
  ajk68: Today's puzzle seems broken. Qxd3 and the evaluation of the position doesn't change significantly from a few moves earlier.
Nov-19-17
Premium Chessgames Member
  ajk68: This puzzle appears to be more about white blundering.
Nov-19-17  diagonalley: OTB i am sure (being a mere mortal) i would have played 15.... P-B4 - apparently inferior, but it seems that it was the engine's second choice
Nov-19-17  Walter Glattke: 19.Qd4 better
Nov-19-17  siggemannen: "U Mad, Bro"?
Nov-19-17  mel gibson: The computer calls it close to a draw:

15. Bb2 Nxd3 (15. .. Nxd3 (♘e5xd3 ♕e4xd3 ♗e7-f6 ♘b1-c3 ♗d7-c6 ♘d2-e4 ♗f6-e5 ♕d3-c4 O-O ♖f1-d1 a7-a6 ♕c4-c5 ♖a8-c8 ♘c3xd5 ♗c6xd5 ♗b2xe5 ♖c8xc5 ♘e4-f6+ ♕d8xf6 ♗e5xf6 ♖c5-c2 ♖a1-c1 ♖f8-c8 ♖c1xc2 ♖c8xc2 a3-a4 b7-b5 a4xb5 a6xb5 ♖d1-a1 ♔g8-f8) +0.87/18 176)

score for Black +0.87 depth 18.
. . .

However following the text, by move 21 it's mate in 10:

21. gxf3 Bc5+ (21. .. Bc5+ (♗e7-c5+ ♕a7xc5
♖c8xc5 ♖a1-a2 ♕d8-d5 ♘b1-c3 ♖c5xc3 ♖a2-d2 ♘f4-h3+ ♔g1-h1 ♖c3-c1) +M10/15 22)

Black wins - mate in 10.

Nov-19-17  morfishine: Doesn't seem that insane

*****

Nov-19-17  patzer2: I suppose the main point of today's Sunday puzzle (15...?) is realizing 15...Nxd3!! breaks the pin with a good game for Black because the en prise Rook on h8 is poison.

If White takes the bait with 16. Bxh8?, Black gets more than ample compensation for the exchange with 16...N5f4! Indeed, after 15...Nxd3!! 16. Bxh8? N5f4! -+ (-3.87 @ 29 ply, Stockfish 8), Black has a winning attack.

So, as <ajk68> observes, White's best response to 15...Nxd3!! is simply 16. Qxd3 when Black remains a pawn up with a clear advantage after 15...Nxd3!! 16. Qxd3 Bf6 ∓ (-1.14 @ 35 ply, Stockfish 8).

However, without 15...Nxd3!! 16. Qxd3 Bf6 ∓ being a clearly decisive advantage, a case can be made that <diagonally>'s suggestion of 15...f5 ∓ <the engine's second choice> is almost as good.

After 15...f5 16. Qxe5 Bf6 17. Qd6! (not 17. Qe2? Nf4 ∓ to -) 17...Bxb2 18. Ra2 Bg7 19. Bxf5 Qe7 20. Bg6+ Kd8 21. Qxd7+ Kxd7 22. Be4 Rac8 ∓ (-0.62 @ 32 ply, Stockfish 8) White has regained his pawn but Black's superior development and control of space gives him a clear advantage.

The reason 15...Nxd3 is slightly better than 15...f5 is that after 15...Nxd3 16. Qxd3 Bf6 ∓ Black keeps the extra pawn which he doesn't retain in the 15...f5 computer line above.

P.S.: For a White improvement, our Opening Explorer and Stockfish 8 chess engine suggest 11. Re1 ⩲ as in White's win in S Fenil vs S Prathamesh, 2008 is slightly better than the game continuation 11. Qa4 =.

Nov-19-17  njchess: I got this, but to be fair, only because I couldn't find another decent alternative, let alone a strategy. Call it pure coincidence. I figured take the bishop to compensate for losing the rook and then try to hold the knight with the other knight. I'm not sure I would have played Rc8 followed by Bc6! though. I had pretty much assumed that White would play g2 at some point. Tough puzzle.
Nov-19-17
Premium Chessgames Member
  thegoodanarchist: The Boe & Jo' Show.
Nov-19-17  5hrsolver: I had an alternative variation but maybe not as forcing.

20...Bc5+ 21. bxc5 Ne2+ 22. Kh1 Nf2+ 23. Rxf2 Qd1+ and checkmates.

Nov-19-17  patzer2: <5hrsolver> Your alternative follow-up 20...Bc5+! -+ (-9.97 @ 32 ply, Stockfish 8) is forcing enough.

The only way Black can significantly delay the mate is by surrendering the Queen with 20...Bc5+ 21. Qxc5 Nxc5 -+.

Nov-19-17  5hrsolver: Thanks <patzer2>.

Here is a fun line to go with that.

20...Bc5+ 21. Bd4 Qxd4+ 22. Nxd4 Bxa7 and black wins the knight on d4 too and more material to follow.

Nov-19-17  Marmot PFL: Didn't get too far with this one, would have played 15...f5 16 Qxe5 Bf6
Nov-19-17  Sularus: tried to make Nf3+ work :D
Nov-19-17  NBZ: Like many others, I also went for f5 Qxe5 Bf6.
Dec-03-17  JJPro1234567890: b4 is the better move during move 18

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