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Vlastimil Jansa vs Thor Geir Harestad
World Senior 65+ (2017), Acqui Terme ITA, rd 3, Nov-09
Formation: King's Indian Attack (A07)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Nov-09-18  Granny O Doul: White must have many paths to victory after the initial 18. Nf6+ Bxf6 19. exf6 e5. For instance, 20. Qh5 and if ...h6 (what else?) 21.fg Kxg7 (what else?) 22. Rd6 Rh8 (what else?) 23. Bxc6 Bxc6 (what else?) 24. Bxe5+ and what now?
Nov-09-18
Premium Chessgames Member
  al wazir: I went for 18. Nxh7 Kxh7 19. Nf6+.

If 19...gxf6, then 20. Qh5+ Kg8 21. exf6 Bxf6 22. Be4 wins.

But after 19...Bxf6 20. Qh5+ Kg8 21. exf6 (if 21. Bh6, either 21...Nxe5 or 21...f5 defends) gxf6 (21...g5 22. Qh6) 22. Be4 (22. Bh6 Ne5) f5, white has nothing better than a perpetual.

Rats. It *should* win, but it doesn't.

Nov-09-18  scormus: <what now?> 1-0 perhaps not sure about 23 ... Bxc6, I think ... Qxc6 puts up more resistance. so I thought 23 Rd6 before Bxc6.
in any case 20 Qh5 looks clearly winning
Nov-09-18  Walter Glattke: I also would prefer the Al Wazir moves, I saw the same first, so 18.Nxh7 Kxh7 (or NxR) 19.Nf6+ Bxf6 20.Qh5+ Kg8 21.exf6 e.g.Nd5 22.fxg7 Nxf4 23.gxf8Q+ Qxf8 24.gxf4 +- or 22.Be4 wins.In the match they played 22.-e5, 23.Be3 Nd4, but 23.-h6 is more difficult to win, Play 18.Nxh7, and you will win.
Nov-09-18  Walter Glattke: 22.Be4 is perpetual, but 22.Bh6 Ne5 23.Be4 f5 24.Qg5+ Ng6 2 hanging rooks and 25.Qf6 decides.
Nov-09-18
Premium Chessgames Member
  OhioChessFan: ** Coming In a Few Hours! **

World Chess Championship 2018 Moves Prediction Contest. Conducted by the Legendary <chessmoron> and hosted at Graceland, home of Elvis. Click on Elvis for details.

Nov-09-18  actinia: this is a terrible friday puzzle. it really just comes down to winning the exchange on the h2-b8 diagonal
Nov-09-18
Premium Chessgames Member
  malt: Went for 18.Nf6+ gf6 19.ef6 B:f6 20.Qh5 B:g5 21.Q:g5+ Kh8 22.Qf6+ Kh8 23.Bh6 and #
Nov-09-18  schachfuchs: I guess the computer provides the clearest, most forced finish ;-)

19... e5 +16.37 (24 ply) 20.Qh5 h6 21.fxg7 Kxg7 22.Rd6 Rh8 23.Nxf7 Qxf7 24.Bxh6+ Rxh6 25.Qxh6+ Kg8 26.Rg6+ Qxg6 27.Qxg6+ Kf8 28.Bxc6 Bxc6 29.Qd6+ Kf7 30.Qxb8

Nov-09-18  Walter Glattke: After 18.Nf6+ gxf6 19.exf6 black must play 19.-h6 e.g. 20.Qh5 Bxf6 21.Qxh6 Bg5 22.Bg5 f6 I see a chance to escape by 19.-h6. 20.fxe7 Qxe7 21.Qh5 Qf6 etc.
Nov-09-18  TheaN: Friday 9 November 2018

<18.?>

I have to admit I stopped calculating at what was probably the most critical point of the <18.Nxh7?!> variation.

It's obvious White can start a destructive combination on the king side, but how?

<18.Nxh7?!> is not best but does win:

A) <18....Nxe5> is an interesting intermezzo that should be taken seriously, as if Black is allowed to exchange on the long diagonal and the Queen gets there, Nf3+ is destructive. However, because White controls both the long and short a8-h2 diagonals Black's busted: <19.Bxb7> probably most forcing to trade, the key being <19....Kxh7 20.Bxe5 Rxb7 21.Qe4+ +->

B) <18....Kxh7 19.Nxf6+> the point of the combination.

B1) <19....K move 20.Qh5#> so nope.

B2) <19....gxf6> cuts off the only defender. Should not be a good idea. <20.Qh5+ Kg8 (Kg7 21.Qh6+ Kg8 22.exf6 Bxf6 23.Be4 with 24.Qh7#) 21.exf6 Ne5 (Bxf6 22.Be4 with 23.Qh7#) 22.Bxe5 Bxf6 23.Be4 with 24.Qh7#).>

B3) <19....Bxf6> the key variation, and the one I miscalculated partly. It's obvious White should continue with <20.Qh5+ Kg8 21.exf6> but here I was confident enough White will press the mating attack. He does in a sense, but not truly. <21....gxf6!?> now yes, because most attackers have been eliminated.

A mistake is 22.Bxb8? as White invested a piece. No mate, Rook vs two pieces, White's better off taking the perpetual on the g- and h-files rather than playing on.

Instead, <22.Qg4+! Kh7>. Now, aiming at f6 with Qh4+ gives White a plus, but Stockfish confirms White has the shocker <23.Rd6!!>. No, I did not see that one myself.

The obvious threat is 24.Be4+ (the threat's just as effective without check if the King's on h8): Black has been deprived of f5, because of Bxf5! and the recharged attacker on d6 lifts to h6 with mate. After 23....Ne5, White will play 24.Qh4+! still and take on f6 (Kg8 Qxf6, Kg7 Qh6+ with Qxf6, and Kg6 Qh6+ with mate next) and the Knight en prise.

So, Black should instead preemptively play <23....f5> after which White <24.Qh4+ Kg8>, Kg6/g7 are both errors that lead to mate, <25.Bxc6! Bxc6 26.Qf6 Kh7> else mate with Bh6 (White just sacs on d5) <27.Be5 Rg8 28.Qh4+ Kg6 29.f4! Qf8> else mate <30.Qg5+ Kh7 31.Qh5+ Qh6 32.Qxf7 Rg7 33.Bxg7!> the key is winning another tempo here to take on c6. <33....Qxg7 34.Qxg7+> Qh5+ is slightly better as computer variation, but in practice just take on g7 <34....Kxg7 35.Rxc6 +-> and White has a won endgame.

Yeah just play 18.Nf6+ :>.

Nov-09-18  Cheapo by the Dozen: I didn't work all the lines out properly, so I went with the inferior but still winning Nxh7. If Black tries to keep both knights he gets quickly mated much as in the game. If he gives up his DSB he also winds up exposing the rook at b8, so White winds up with a decent material situation plus an attack.
Nov-09-18
Premium Chessgames Member
  gofer: Well, I see a number of tries; Nf6+, Nh6+, Nxh7, Qc2, Qe4, Be4. Nf6+ seems the most forcing. Qc2 seems the most positional. But after a long time, like an hour, I finally see a double knight sacrifice that looks unstoppable!!!

<18 Nxh7 ...>

Refusing the sacrifice is just losing, so black has to accept.

<18 ... Kxh7>
<19 Nf6+! ...>

The royal fork is very forcing, so again black has little choice but to accept. Especially as all other replies are mate in one (19 ... Kg6/Kh8 20 Qh5#), but which piece to take back with??? Taking with the pawn looks like mate in 7 more.

19 ... gxf6
20 Qh5+ ...

20 ... Kg8
21 exf6 Bxf6
22 Be4 any move
23 Qh7#

20 ... Kg7
21 Bh6+ ...

21 ... Kg8
22 Qg4+ Kh7/Kh8
23 Qg7#

21 ... Kh8/Kh7
22 exf6 Bxf6
23 Bg5+ Kg7 (Kg8 Bxf6 any move Qh8#)
24 Qh6+ Kg8
25 Bxf6 any move
26 Qg7#/Qh8#

<19 ... Bxf6>
<20 Be4+ ...>

20 ... Kg8
21 exf6 g6

<20 ... g6>
<21 exf6 Kg8>
<22 Qg4 ...>

This looks to be winning, white sacrifices everything to keep Pf6 and simply plays Qh4, Qh6 and Qg7# at the opportune moments...


click for larger view

~~~

Hmmm, only Cheapo by the Dozen and TheaN seems to think there is anything of merit in Nxh7. My only question is whether <20 Be4+> is good or not!

Nov-09-18  saturn2: I took 18. Nf6+

18...gxf6 19. exf6 Bxf6 20. Qg4 Bxg5 21. Qxg5+ Kh8 22. Qf6+ Kg8 23. Bh6

and if the bishop takes the knight I had

18...Bxf6 19. exf6 gxf6 20. Qg4 Ne5 21. Bxe5 fxe5 22. Nxe6+ Kh8 23. Qg7#

Nov-09-18  Ceri: Hi, all,

I went for 18. Nxh7 and got as far as:

1. e4 c5 2. Nf3 e6 3. g3 Nc6 4. Bg2 Nf6 5. Qe2 d6 6. O-O Be7 7. c3 O-O 8. d4 Qc7 9. dxc5 dxc5 10. e5 Nd7 11. Bf4 Rb8 12. Na3 a6 13. Nc4 b5 14. Ne3 Nb6 15. Rad1 Bb7 16. Ng4 Qc8 17. Ng5 Qe8

18. Nxh7 Kxh7 19. Nf6+ Bxf6 20. Qh5+ Kg8 21. exf6 gxf6 22. Qg4+ Kh7 23. Qh4+ Kg8 24. Bh6 Ne7

Unsure as to the best continuation, I asked Stockfish, which came up with:


click for larger view

25. g4 = mate in 8

Cheers,

Ceri

Nov-09-18  saturn2: In the gameline 23 Qg4 seems also good.
Maybe black has seen this move because 22..Nd4 appears desperado.
Nov-09-18  drollere: i also went for Nf6+, and got
18. Nf6+ gxf6
19. Nxh7 Kxh7
20. Qh5+ Kg8
21. Qg4+ Kh8
22. Qh4+ Kg8
23. exf6 Rd8
24. Qg5+ Kh8
25. Qh6+ Kg8
26. Qg7#

although Bxf6 is perhaps better. but it's a hot mess for black either way.

Nov-09-18  Granny O Doul: Scormus, your 23...Qxc6 (abandoning the f7 square) allows mate in one.
Nov-09-18
Premium Chessgames Member
  Breunor: Thor got hammered! (or maybe Mjollnered).

According to the computer, the losing move is 17 ... Qe8

1) +4.82 (21 ply) 18.Nf6+ Bxf6 19.exf6 g6 20.Bxb8 Qxb8 21.Ne4 Qe5 22.Qe3 Qh5 23.Qxc5 Nd5 24.f4 Nd8 25.Rde1 Bc6 26.Bf3 Qf5 27.b4 h6 28.Re2 h5 29.Rd1 Bb7 30.Qa7 Bc6 31.Qxa6

Instead pretty even is 17 .. Nd5:

1) +0.31 (19 ply) 18.Be4 Bxg5 19.Bxg5 Nce7 20.Qd2 Nf5 21.Rfe1 c4 22.h3 Qc5 23.Nh6+ Nxh6 24.Bxh6 f6 25.Bf4 Nxf4 26.gxf4 Bxe4 27.Rxe4 Kh8 28.b3 cxb3 29.axb3

Nov-09-18
Premium Chessgames Member
  agb2002: The first idea that comes to mind is 18.Nf6+. For example, 18... gxf6 19.exf6 Bxf6 20.Qh5 Bxg5 21.Qxg5+ Kh8 22.Qf6+ Kg8 23.Bh6 and 24.Qg7#.

I haven't found the time for more.

Nov-09-18  5hrsolver: 18. Nxh7 Kxh7 19. Nf6+ Bxf6 20. Qh5+ Kg8 21. exf6 gxf6 22. Qg4+ Kh8 23. Qh4+ Kg8 24. Bh6 Kh7 25. Bg5+ Kg8 26.Bxf6 and mate on h8.

But 18.Nf6+ was probably better cause it jams the kingside right away.

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