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Istvan Csom vs Stefan Kindermann
Biel-JMT (1986), Biel SUI
English Opening: Symmetrical Variation. Hedgehog Defense (A30)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
May-15-21  mel gibson: I saw the first ply but I was unsure about it.

Stockfish 13 shows that the Black King can
avoid a fast checkmate by White.

It says:

23. Nxf6+

(23. Nxf6+ (♘e4xf6+ ♗e7xf6
♕e3xe6+ ♔g8-h8 ♗b2xf6 ♕c7-b7 f2-f3 g7xf6 ♕e6xf6+ ♔h8-g8 ♖c1-c4 ♘c6-e7 ♖c4-d4 ♕b7-c7 ♕f6-e6+ ♔g8-f8 ♖d4-d7 ♕c7xd7 ♕e6xd7 ♖c8-c6 ♕d7-d8+ ♔f8-f7 ♕d8-d3 ♖c6-h6 ♕d3xa6 ♖h6-d6 ♕a6-b5 h7-h6 ♕b5-h5+ ♖d6-g6 b3-b4 ♔f7-e8 a2-a4 ♔e8-d8 ♕h5-e5 ♘e7-c8 a4-a5 b6xa5 b4xa5 ♖g6-d6 h2-h4 ♖d6-c6 ♕e5-b5 ♖c6-d6 g3-g4 ♘c8-a7 ♕b5-c5 ♘a7-c8 h4-h5 ♖d6-e6 ♕c5-c4 ♖e6-f6 a5-a6) +6.17/38 175)

score for White +6.17 depth 38.

May-15-21  Walter Glattke: 25.Rc4 is the key (23.Nxf6 gxf6 24.Qxe6+ Kg7) 25.-Qd6 26.Rg4+ Kh8 27.Qxc8+ Nd8 28.Rd4 wins B) 23.-Kh8 24.Qxe6 Bxf6 25.Bxf6 gxf6 26.Qxf6+ Kg8 27.Rc4 Knight pinned, so 27.-Qg7 (or mate attack) 28.Rxc6 Qxf6 29.Rxf6 Rc2 30.Rxb6 Rxa2 31.e4 3 pawns ahead
May-15-21
Premium Chessgames Member
  An Englishman: Good Evening: Although we have another speculative sacrifice here, can't claim success this time--did not see the key third move of the game line, which seems like a prerequisite to claim full credit.
May-15-21
Premium Chessgames Member
  drollere: this seemed simple: white trades a piece for four linked Kside pawns. i had 23. Nxf6+ Bxf6, 24. Qxe6+ but missed Kh7 as a defense, which makes Bxf6 unworkable. so i never considered the needed resource: Rc4. 24. .. Kf8, 25. Bxf6 gxf6, 26. Qxf6+ Ke8 is also bad.
May-15-21  Brenin: Yet another POTD in which the first few moves are obvious, but the follow-up is more delicate. OTB I'd consider 3P for the N (even after 24 ... Kg7 the third will surely fall), the exposed Black K, the relative absence and immobility of his lieutenants, and (if all else fails) the prospect of a White endgame pawn-roller, all in favour of being bold.
May-15-21  Socrates2: 30. Qh7 - all over.
May-15-21
Premium Chessgames Member
  chrisowen: Nearly key in Nxf6+ hadn’t a foggy plugger black by wobble key in nearly cap bap backs it eek blacks in ebb livid win quandary it dotty hm jenga block june its change bod in i grass let again pay within ebb Qb7 gab again as kid Rc8 go aha it hark in again ho totadd he eon feels aorta jack on costed it hup in i fifties bad in fanfare Nxf6+ fluff;
May-15-21
Premium Chessgames Member
  chrisowen: Aint aloof f6 finish goodness hi rc4 got your kicks no?
May-15-21
Premium Chessgames Member
  Messiah: Not the easiest puzzle, I like it very much.
May-15-21  RandomVisitor: 21...Qc7 is apparently the mistake here - 21...Nb4 22.Qxb6 Nd5 perhaps has equal chances.
May-15-21  RandomVisitor: After 23...Nxf6+ nothing works for white


click for larger view

Stockfish_21050709_x64_modern:

52/62 1:36:26 +6.86 23...gxf6 24.Qxe6+ Kg7 25.Rc4 h5 26.Qf5 Kf7 27.Qxh5+ Ke6 28.Re4+ Kd7 29.Qg4+ f5 30.Qxf5+ Kd8 31.Bd4 Rb8 32.Bf6 Bxf6 33.Qxf6+ Kc8

51/67 1:36:26 +8.21 23...Kf7 24.Nh5 Bf8 25.Qe4 Qd7 26.Qxh7 e5 27.Rc3 Nd4 28.Rxc8 Qxc8 29.Bxd4 exd4 30.Nf4 Qc6+ 31.f3 Be7 32.Qf5+ Qf6 33.Qd5+ Ke8

45/64 22:40 +7.72 23...Bxf6 24.Qxe6+ Kh8 25.Bxf6 Qb7 26.f3 gxf6 27.Qxf6+ Kg8 28.Rc4 Ne7 29.Rd4 Ng6 30.Qe6+ Kf8 31.Rd7 Qxd7 32.Qxd7 Re8 33.Kf2 Re7

May-15-21
Premium Chessgames Member
  Jimfromprovidence: I could not figure out how white wins after 23 Nxf6+ Bxf6.

<RandomVisitor> has this line, the beginning of which is...

...<45/64 22:40 +7.72 23...Bxf6 24.Qxe6+ Kh8 25.Bxf6 Qb7 26.f3 gxf6 27.Qxf6+ Kg8 28.Rc4 Ne7>


click for larger view

Now what? 29 Rg4+ is answered by 29...Ng6.

How about 29 Rd4!


click for larger view

The threat is 30 Qe6+ followed by 31 Rd7. Don't think black has a response that does not give up material.

Never would have found it on my own.

May-15-21
Premium Chessgames Member
  agb2002: The position invites to play 23.Nxf6+ but I've been unable to find a clear winning maneuver after 23... gxf6 (23... Bxf6 24.Qxe6+ followed by Bxf6 and Rc4 looks very good for White) 24.Qxe6+ Kg7 (else 25.Bxf6 as above) 25.Rc4 h5.
May-15-21  bubuli55: A Sacrifice. And Then Csom
May-15-21  King.Arthur.Brazil: I felt not convinced about 23.♘xf6+ until the move 25.♖c4 which I liked so much. However, as usual, I didn't agree with fishouse, in the line: 30.♕h7!! (which just win the Black ♕, what else?) 30...♕g6 31.♖xg6 (why did someone would play 31.♕xg6?, fishouse without brains?) and check-mate next! Unbelievable! Tell me please, how many neurons does fishhouse have? lgs.
May-15-21  King.Arthur.Brazil: Just to complete: if 30. ♕h7 ♕g6 31. ♖xg6 ♔e8 32. ♖g8+ ♔d7 33. ♕f5+ ♔c7 34. ♕xc8+ ♔d6 35. ♗a3+ ♔e5 36. ♕c7+ ♔e6 37. ♕xc6+... White win all Black's material easily.
May-15-21
Premium Chessgames Member
  Breunor: agb2002,

In your line after 23 Nxf6ch gxf6 24 Qe6 ch Kg7 25 Rc4 h4, the game line, Stockfish gives:

1) +3.69 (28 ply) 26.Qf5 b5 27.Re4 Rh8 28.Re6 Rh6 29.Qe4 h4 30.Rxc6 Qd7 31.Qe6 Qxe6 32.Rxe6 Kf7 33.Rxa6 hxg3 34.hxg3 Rg6 35.Ra7 f5 36.Kf3 b4 37.Bd4 Rc6 38.e4 fxe4+ 39.Kxe4 Ke8 40.f4 Rg6 41.Kf3 Rd6 42.Bc5 Rd7 43.Rxd7 Kxd7

I guess this is one of these cases where the win isn't 'obvious' but the overall position is 'winning'.

May-15-21  RandomVisitor: Instead of 21...Qc7 how about either:


click for larger view

Stockfish_21050709_x64_modern:

<67/59 9:50:34 -0.00 21...Nb4> 22.Qxb6 Nd5 23.Qd4 Rd8 24.Qa7 Qc2 25.Nc3 Kf8 26.Nxd5 exd5 27.Qd4 Qxe2 28.Rc1 Qe4+ 29.f3 Qe2+ 30.Qf2 Qd3 31.Rc3 Qb1

<66/79 9:50:34 +0.06 21...Rd8> 22.Rc1 Qb7 23.Qf3 Rd5 24.h3 Nd8 25.g4 h6 26.Ng3 Bd6 27.Nf1 Bc5 28.h4 a5 29.Rc4 Rd7 30.Qxb7 Nxb7 31.h5 Nd6

May-16-21
Premium Chessgames Member
  agb2002: <Breunor> Thank you!

I had the impression that any move of the rook along the fourth rank would release the pin and thus give Black some defensive chances.

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