Vladimir Antoshin vs Julius Kozma (1963)

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Vladimir Antoshin vs Julius Kozma
Chigorin Memorial (1963), Sochi URS, rd 11, Jun-??
Gruenfeld Defense: Russian. Prins Variation (D97) · 1-0

ANALYSIS [x]

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Nov-02-13		abuzic: 21.Bxh6 21...Nxc3 22.Bxg7 Ne2+ 23.Qxe2 Qxd6 If the K takes the B then white accelerates winning by mating sac: <23...Kxg7? 24.Rxf7+! Bxf7 25.Qg4+ Kh8 26.Qh4+ Kg8 27.Qg5+ Kh7 28.Qf5+ Kh8 29.Qf6+ Kh7 30.Qxf7+ Kh8 <30...Kh6 31.Qg6#> 31.Ng6#> 24.Bf6 Qd4+ 25.Kh1, and Qh5 cannot be prevented with effective defence. If 21...Bxe5 22.Qg5+ Kh7 23.Qxe5 Kxh6 24.Nxd5 Bxd5 25.Rf6+ Kh7 <25...Kg7 26.Rxf7+! Kxf7 27.Rf1+ Kg8 28.Qxd5+ another mating net> 26.Qg5

Nov-02-13		abuzic: So black played 25...Kg7 and white didn't see the R sac immediately, playing 24.Qh5 (continuing the strong attack) 24...Qxd6 25.Rxf7+ (so Qh5 prepared for the sac, which was not necessary) 25...Bxf7 26.Qxf7+ Kh6 <26...Kh8 29.Ng6+ Qxg6 30.Qxg6> 27.Ng4+ Kg5 28.Qg7+, which leads to a marathon king hunt: 28...♔f5 29.♖f1+ ♔e4 30.♘f6+ ♔d3 31.♕g6+ ♔d4 32.♖d1+ ♔c5 33.♘e4+ ♔b4 34.♕xd6+ ♔a5 35.♖d5+ <alternatives are ♘c3; ♘c5; b4+; ♕d5+> ♙b5 36.♕a3+ ♔b6 37.♖d6+ ♔c7 38.♕a5+ ♔c8 39.♕xa6+ ♔c7 40.♕c6+ ♔b3 41.♖d7 and mate next the king's journey from f5 to b1! click for larger view

Nov-02-13		radtop: It took me a while to see why 28....Qg6 didn't work. The rest was t technical for me.

Nov-02-13		diagonalley: it's barely possible to believe that this sequence was fully anticipated at move 21. more like it was a "let's go for it" ... but another lovely example of a Q + N ballet

Nov-02-13		morfishine: <21.Bxh6> is the most forcing move. I was able to rule out 21...Bxe5 due to 22.Qg5+ Kh8 23.Qxe5+ f6 24.Rxf6 Nor does <21...Bxh6> seem feasible due to 22.Qxh6 Qxd6 23.Rxf7 and Black cannot play 23...Bxf7 since his Queen is hanging <21...Nf6??> is ruled out quickly due to 22.Bxg7 Kxg7 23.Qg5+ Kf8 24.Qxf6 Another possibility for Black is <21...Nxc3> but after 22.Bxg7 (not 22.bxc3? due to 22...Qc5+ followed by 23...Qxe5)...Nxe2+ 23.Qxe2 Kxg7 24.Qh5 White is overwhelming a favorite attack point: <f7> *** PM: Nice finish by White that was too murky for me to visualize in its entirety ***

Nov-02-13		patzer2: Beginning with 21. Bxf6, I actually guessed the first four moves of this Saturday puzzle. However, I missed 25. Rxf7! and the remainder of the follow-up. I'll need to crank up a chess engine or take out the analysis board to figure out all the details of White's deep combination.

Nov-02-13		agb2002: The material us identical. Black threatens 21... Nxf4 22.Qxf4 Qxd6 23.Nxc4 Qxf4 releasing some pressure. The first idea that comes to mind is 21.Bxh6: A) 21... Bxe5 22.Qg5+ Kh7 23.Qxe5 Kxh6 24.Nxd5 Qc5+ 25.Kh1 (25.Qe3+ Qxe3 26.Nxe3 only seems to win a pawn; 25.Ne3 Qxe5) 25... Qxd5 26.Qf6+ Kh7 27.Rf4 followed by Rh4 winning. B) 21... Qxd6 22.Qg5 Qf8 23.Nxd5 Bxd5 24.Nxf7 Bxf7 25.Rxf7 Qxf7 26.Bxc4 wins (26... Re6 27.Bxe6 Qxe6 28.Qxg7#). C) 21... Bxh6 22.Qxh6 C.1) 22... Qxd6 23.Nxd5 (23.Rxf7 is interesting) 23... Qxd5 (23... Bxd5 24.Qxd6; 23... Qxe5 24.Nf6+) 24.Qg5+ Kf8 (24... Kh7(8) 25.Rf4) 25.Ng6+ Kg7 (25... Kg8 26.Ne7+) 26.Qf6+ Kh7 27.Rf4 fxg6 28.Rh4+ Qh5 29.Bxh5, etc. C.2) 22... Qc5+ 23.Kh1 Qe3 24.Qh5 with many threats (Rf3, Nxf7, Nxd5, etc.).

Nov-02-13		Kikoman: <21. Bxh6> leads to a King Hunt. Good puzzle.

Nov-02-13		kevin86: The king is hunted and will be soon,dead.

Nov-02-13		numbersguy70: After 24.Rxf7 Bxf7, mate would take 8 to force but is easy, as the black bishop becomes little more than a pawn and the black queen might as well not be on the board. The knight and queen work so well together.

Nov-02-13		Jimfromprovidence: <abuzic> <21.Bxh6 21...Nxc3 22.Bxg7 Ne2+ 23.Qxe2 Qxd6 If the K takes the B then white accelerates winning by mating sac: 23...Kxg7? 24.Rxf7+!> This move deserves some more explanation. click for larger view One can figure out that sacrificing the rook opens up the c8-h3 diagonal for 25 Qg4+. What's easy to overlook is that black cannot play 25...Kf8 after 24...Bxf7 25 Qg4+ because of 26 Nd7#, below, opening him up to the queen and knight mating net. click for larger view

Nov-02-13		Patriot: 21.Bxh6 seems the most logical. 21...Bxh6 22.Qxh6 threatening 23.Rf3 and 24.Rg3+. 21...Bxe5 22.Qg5+ Kh7 23.Qxe5 Rg8 24.Qh5 Rg6 looks like a pretty good defense but I don't think this poses a problem for white. 21...Bxe5 22.Qg5+ Kh7 23.Qxe5 Kxh6 24.Rf3 f6 25.Qh5+ Kg7 26.Rg3+ Kf8 27.Qh8+ There is much more to this! I would play 21.Bxh6.

Nov-02-13		Patriot: I made a big mistake in the last line: 25.Qh5+? Kxh5 since the rook on f3 is blocking the bishop defense on the queen. This is a very complicated problem!

Nov-02-13		abuzic: <Jimfromprovidence: <abuzic> <21.Bxh6 21...Nxc3 22.Bxg7 Ne2+ 23.Qxe2 Qxd6 If the K takes the B then white accelerates winning by mating sac: 23...Kxg7? 24.Rxf7+!> This move deserves some more explanation. One can figure out that sacrificing the rook opens up the c8-h3 diagonal for 25 Qg4+. What's easy to overlook is that black cannot play 25...Kf8 after 24...Bxf7 25 Qg4+ because of 26 Nd7#, below, opening him up to the queen and knight mating net.> That was a teaching comment on the position arising after 23...Kxg7? 24.Rxf7+!.. I may add that the king cannot play 25...Kf6 either after 24...Bxf7 25.Qg4+ because of the same 26.Nd7# click for larger view

Nov-02-13		Penguincw: I considered 21.Bxh6 (trying to fork the king and rook on f6).

Nov-02-13		Prosperus: @radtop Why didn't 28. ...Qg6 work?

Nov-02-13		Patriot: <agb2002> <A) 21... Bxe5 22.Qg5+ Kh7 23.Qxe5 Kxh6 24.Nxd5 Qc5+ 25.Kh1 (25.Qe3+ Qxe3 26.Nxe3 only seems to win a pawn; 25.Ne3 Qxe5) 25... Qxd5 26.Qf6+ Kh7 27.Rf4 followed by Rh4 winning.> I considered this line and somehow missed 27.Rf4. I'm wondering now if I still saw the knight sitting on d5 guarding f4.

Nov-02-13		Patriot: <morf> <morfishine: <21.Bxh6> is the most forcing move. I was able to rule out 21...Bxe5 due to 22.Qg5+ Kh8 23.Qxe5+ f6 24.Rxf6> Yeah that's a killer! There is also 22...Kh7 which really poses a challenge.

Nov-02-13		bright1: So after 28. ... Qg6 29. h4+ Kh5 (if Kf4 30. Rf1+) 30. Nf6+ forces the win of the black queen

Nov-02-13		evlozare: after 21....Nxc3, what's wrong with 22. Qg5?

Nov-02-13		TimothyLucasJaeger: @evlozare 21 ... Nxc3 22 Qg5 can be met by 22 ... Qc5+ and 23 Qxe5

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