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Jonny Hector vs Christer Hartman
Isle of Man op (1996), rd 8
Four Knights Game: General (C46)  ·  1-0


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sac: 24.Nfh5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Premium Chessgames Member
  FSR: 24.Nfh5 gxh5 25.Nxh5 Nf3+ 26.Rxf3 Rxh5 27.gxh5 Qe7 (otherwise White starts packing up on the bishop with Rfd3 and Bc6) 28.Rg3+ 1-0
Nov-24-17  mel gibson: I wasn't sure about this one but when the solution was shown it was obvious. The computer says:

24. Nfh5 (24. Nfh5 (♘f4-h5 g6xh5
♘g3xh5 ♘e5-f3+ ♖f1xf3 ♕d8-g5 ♕h6xg5+ ♘h7xg5 ♘h5-f6+ ♔g8-g7 ♖f3-f4 ♘g5-e6 ♘f6xe8+ ♗d7xe8 ♖f4xb4 ♖a5-c5 ♖b4-c4 ♖c5xc4 b3xc4 f7-f5 ♖d1-d3 f5xg4 h3xg4 ♔g7-f6 ♖d3xa3 ♗e8-g6 ♔g1-f2 ♔f6-g5 ♖a3-a6 ♘e6-f4 ♖a6-a5+) +5.38/18 106)

score for White +5.38 depth 18.

Premium Chessgames Member
  al wazir: Why didn't black play 29...Rxd5 instead of 29...Rxc2, giving up a piece? After 30. Bxd5 c6, white still has some work to do to get the win.
Premium Chessgames Member
  Gilmoy: I swiftly saw that Black can't cover g7, and so the double-Nh5 trick works. Hence I thought Black had to countersac to blow that up:

24.Nfh5 Nf3+ 25.Rxf3 <will-see-f7!> Rxh5 <confound>:

click for larger view

26.Nxh5 gxh5

Black is down a rook, but staves off that mate threat. I think White promptly wins by returning the rook: 27.Rxf7! Kxf7 28.Bd5+ <bodes ill> and everything falls.

click for larger view

So ... maybe Black <did> see this, and had to keep looking!

Premium Chessgames Member
  agb2002: The material is identical.

Black threatens Qg5 to stop the attack.

The weak dark squares around the black king suggest 24.Nfh5 gxh5 25.Nxh5 Qg5 26.Nf6+:

A) 26... Qxf6 27.Rxf6 Nxf6 28.Qxf6 + - [Q+P vs r+n].

B) 26... Nxf6 27.Qxg5+ Kf8 28.Qxf6 + - [Q+P vs n].

C) 26... Kh8 27.Qxh7#.

Premium Chessgames Member
  thegoodanarchist: I got the first 2 moves and was too lazy to do anything more. Must have been all the holiday tryptophan.
Nov-24-17  Walter Glattke: I prefer 25.Be4 Qg5 26.Bxh7+ or
25.-f5 26.Rxf5 Bxf5 27.Rxd8
Nov-24-17  Walter Glattke: 25.Be4 Re6? 26.Bxh7+ Kh8 27.Bg6+ Kg8 28.Qh7+ Kf8 29.Rxf8+ mating
Nov-24-17  Nichth: Went for Ngh5. Whilst the computer told me it's an inferior choice, it's not by much - it certainly doesn't seem to affect the move order greatly afterwards.
Premium Chessgames Member
  malt: 24.Ngh5 gh5 25.N:h5 Qg5 26.Nf6+ Q:f6
Nov-24-17  stacase: <thegoodanarchist: I got the first 2 moves and was too lazy to do anything more. Must have been all the holiday tryptophan.>

Did anyone NOT get the first two moves? Dunno, sometimes these difficult rated puzzles don't start with the difficult move right off the bat.

Nov-24-17  cocker: Reminiscent of Nakamura vs Topalov recently (that game had knights aiming at f5 instead of h5).
Premium Chessgames Member
  malt: Had set the puzzle up wrong, had the king on h1, so missed blacks 25...Nf3+ 26.R:f3 R:h5
Nov-24-17  morfishine: <24.Nfh5> begins a forced sequence zeroing in on <g7>. The obligatory 24...gh5 25.Nh5 Qg5 is easy enough to see, but for some reason, I quickly got sidetracked with <26.Qxg5+> Nxg5 27.Nf6+ Kf8 28.Nxd7+ Nxd7 29.Rxd7 which makes things harder for White, but looks good enough to win


Premium Chessgames Member
  patzer2: For today's Friday puzzle (24. ?), I started with 24. Ngh5 (apparently it doesn't make any difference which Knight moves to h5) and calculated 24. Ngh5 gxh5 25. Nxh5 Qg5 (diagram below)

click for larger view

which transposes back to the game. From my initial calculation, I had planned to follow-up from this position with 26. Qxg5 Nxg5 27. Nf6+ ± to +- (+1.60 @ 33 ply, Stockfish 8) which appears to win for White with great difficulty.

However, when I arrived at the above position (while playing it out) I realized there was a stronger move available with 26. Nf6+! +- which wins the Queen and a pawn in exchange for a Rook and Knight after 26. Nf6+! Qxf6 27. Rxf6+ Nxf6+ 28. Qxf6 +- (+6.50 @ 30 ply, Stockfish 8).

Though not at first obvious, White's position is worth much more than the material count of a mere two pawn advantage after 28. Qxf6 +-.

Premium Chessgames Member
  patzer2: The opening in this game explores an off the beaten path variation of the Four Knights (C47) Opening (i.e. 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 g6).

According to our Opening Explorer, 4...g6 is a rare try (at Master level) that has not worked out well in practice for Black. Instead, Black has had much better results with the popular moves 4...Bc5 as in Black's win in P Miroshnichenko vs A Aleksandrov, 2017 or 4...d5 as in the interesting draw in F Amonatov vs Radjabov, 2016.

However, even though 4...g6 is rarely played, the computer indicates Black gets a level game with it. In this game, Black managed to get a reasonably good position after the first ten moves.

Indeed, Stockfish 8 indicates Black missed a chance for an advantage with the quiet 11...a5 12. g4 = (+0.10 @ 27 ply). Instead the more active 11...b5! ⩱ (-0.36 @ 27 ply) would have given Black the advantage with initiative early in the game.

Black's game started to go down hill with the passive 14...a3?! allowing 15. b3 ⩲ to ± (+0.64 @ 29 ply, Stockfish 8).

Instead, the more active 14...b5! appears to keep Black in the game with a dynamically equal position after 14...b5! 15.e5 dxe5 16.g5 exf4 17.Bxf4 hxg5 18.Bxg5 Ne5! = (+0.12 @ 30 ply, Stockfish 8) as play might continue 19.Bxa8 Qxa8 20.Bxf6 Nf3+ 21.Rxf3 Qxf3 22.Qxd7 Qe3+ 23.Kg2 Bxf6 24.Rf1 Rd8 25.Qg4 Bxc3 26.bxc3 Rd2 27.Rf2 Rxc2 28.a3 Ra2 29.h4 Qe5 30.Qf3 Qe7 31.Kh3 Qe6+ (0.00 @ 39 ply, Stockfish 8).

Premium Chessgames Member
  tpstar: 4. g3 is the Glek Four Knights with a KIA formation for White. Black does well to break in the center with 4 ... d5; after 5. exd5 Nxd5 6. Bg2 then retreat with 6 ... Nde7 = Opening Explorer

Jonny Hector has a very aggressive style. His games are well worth studying for sharp attacking play.

Nov-24-17  Clement Fraud: I don't know whether to laugh or cry at my competence regarding today's puzzle: I saw 1.Nfh5 gh5 2.Nh5 Qg5 very quickly, but after this my "over the board" analysis became murky. I think I even saw the possibility of white winning black's Queen, but wasn't sure who would emerge with the most material overall?? So in the end I dismissed the entire line altogether (believing that it would be a more forcing line)... only to find I'd been closer in the first place?!

I can see with accuracy for around three moves in front, but after this my calculations become very faulty; how do I improve?

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