Ognjen Cvitan vs Peter Kokol (2015)

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Ognjen Cvitan vs Peter Kokol
Maribor open (2015), Maribor (SLO), rd 7, Jun-30
Gruenfeld Defense: Exchange. Spassky Variation (D87) · 1-0

White to move.

ANALYSIS [x]

1-0

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

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Jul-21-16		Penguincw: I just found out that yesterday (Jul/20) was International Chess Day... Anyway, a Thursday puzzle. Would love to play 25.Nd6 right away, except that the queen is hanging. So let's move her out of that line of fire without losing a tempo - 25.Qf6+. The line I calculated next was 25...Kf8/25...Kg8 26.Nd6 (good move, forking f7 and b7, also blocks d8). If 26...Qxd3 then just mate on f7. If 26...Qa1+, I would've incorrectly played 27.Kh2. That leads to 27...Qxe5+ 28.Qxe5 Nxe5, and note that there's no time to take the bishop on b7, because white's own bishop on d3 is hanging. e8 suggests the desperado moves 29.hxg6 hxg6 30.Bxg6 Bxg2 31.Bxf7+ (this is assuming the black king is on g8 - if it's on f8, white goes down 2 pawns) Nxf7 32.Nxf7 Kxf7 33.Kxg2, white is down a pawn, probably not going to win, might draw it. Back to the actual game, unlike my line, black can't take on e5. If 27...Nxe5 then 28.Nf7+ and white wins a piece. If 27...Qxe5, that leads to mate with 28.Nxf7+ Kxh5 29.Qf3+ Kh4 30.Qh3# 1-0. (26...Nxe5 or 26...Qxe5 is probably same story) If 26...Kxh5, then 27.Be2+ Qg4 28.g3 (wow, great waiting move, as white threatens mate on h4). If 28...Kh6 then 29.Nxf7+ Kh5 30.Qg5# 1-0 or 28...g5 29.Nxf7 (another waiting move) and then mate on g5 or h6. Final position, if 30...Kg8 then 31.Nh6# 1-0. If 30...Kf8 then 31.Nd6+ Kg8 32.Qf7+ Kh8 33.Qf8# 1-0. Looks like a pretty easy/simple puzzle, even though I didn't get it completely (missed an important move, Kh2 in response to Qa1+) and I probably missed some important defense for black.

Jul-21-16		al wazir: I missed it. 25. Qf6+ is the obvious first move, but I couldn't find my way through the complications. For example, 25...Kf8 26. Nd6 Nxe5. Now what? White wins the ♕ with 27. Qd8+ Kg7 28. Ne8+, but I didn't see that.

Jul-21-16		dfcx: 25.Qf6+ A. 25...Kf8 26.Ng5 A1. 26...Nd8 27.Nxe6+ wins A2. 26...Qd7 27.Nxh7+ mates B. 25...Kh6 26.g4 wins C. 25...Kg8 26.h6

Jul-21-16		YouRang: Thursday 25.? click for larger view Well, I don't see any move crying to be made more than <25.Qf6+>. Now, black has three choices, and it seems that black's greatest resource (and white's biggest challenge) is the double-attack on Pe5, which could be taken by the black Q or Nc6. ~~~~ [1] <25...Kg8> click for larger view And now: - 26.h6? fails due to ...Qxe5. - 26.Ng5? fails to ...Nxe5 (boths Pf7 and d8 guarded) However, <26.Nd6!!> works by since <26...Nxe5 27.Qd8+> (the Nd6 blocks defense of d8) <27...Kg7> click for larger view Now, <28.Ne8+> wins the queen. ~~~~ [2] <26...Kf8> Also seems to lose to <26.Nd6> for similar reasons. ~~~~ [3] <26...Kh6 27.g4!> click for larger view And black has no good way to stop mate following g5+. ~~~~ Checking with the computer, I see that I missed some options for black, but got the main gist. One key point is that if black plays ...Qa1+, white had best block with Bf1 and not Kh2?, which allows ...Qxe5+ Qxe5 ...Nxe5 and black is probably winning.

Jul-21-16		cocker: A very sharp increase in difficulty, as indicated by lack of posts.

Jul-21-16		ventricule: Interesting, I also wanted to go for <26. ... Kh6 27. g4> , but this actually does not work. Black can simply take the bishop <27. ... Qxd3> and hide on g4 : <28. g5+ Kxh6 29. Ng3+ Kg4>. There's no mate!

Jul-21-16		agb2002: White is one pawn down. Black threatens Qxd3, Q(N)xe5, Qa1+, etc. White can attack the black king with 25.Qf6+: A) 25... Kf8 26.Nd6 A.1) 26... Nxe5 27.Qd8+ Kg7 28.Ne8+ wins the queen. A.2) 26... Kg8 27.Qxf7+ Kh8 28.Qf8#. A.3) 26... Qa1+ 27.Bf1 (27.Kh2 Qxe5+ 28.Qxe5 Nxe5 29.Nxb7 Nxd3 - +) 27... Nxe5 28.Nxb7 (28.h6 Nf3+ wins the white queen) A.3.a) 28... gxh5 29.Nd6 [B vs 3P] looks winning. For example, 29... Qd4 30.Nxf7 Nc6 31.Ne5+ mates or wins Black's remaining pieces. A.3.b) 28... Qd4 29.Nd8 [B vs 2P] with the threats Nxe6+, Nxf7 and Qh8-Qxe5 looks winning. For example, 29... Nf3+ 30.Qxf3 Qxd8 31.h6 or 29... Qd6 30.Qh8+ Ke7 31.Qxe5 Qxe5 32.Nc6+ Kd6 33.Nxe5 Kxe5 34.hxg6 hxg6 35.Bb5 with a won ending in both cases. B) 25... Kg8 26.Nd6 B.1) 26... Nxe5 27.Qd8+ transposes to A.1. B.2) 26... Qa1+ 27.Bf1 is similar to A.3. C) 25... Kh6 26.Nd6 C.1) 26... Qxe5 27.Nxf7+ wins the queen. C.2) 26... Nxe5 27.Nxf7+ mates o wins the queen. Much slower is 27.Qxe5 Qxe5 (27... Qxd3 28.Nxf7#) 28.Nxf7+ Kxh5 29.Nxe5 + - [N vs 2P]. C.3) 26... Nd8 27.Qxd8 C.3.a) 27... Qxd3 28.Nxf7+ and 29.Qxd3 wins. C.3.b) 27... Qd5 28.Bf1 (28.Be4 Qe1+ 29.Kh2 Qxh5+ 30.Kg3 Qxe5+ 31.f4 Qc3+ 32.Bf3 Qe1+ and Black seems to achieve perpetual) C.3.b.i) 28... Qxa2 (or 28... Qxe5) 29.Nxb7 wins. C.3.b.ii) 28... Kxh5 29.Be2+ Kh6 30.Qh4+ Kg7 31.Qf6+ and mate in two. C.3.b.iii) 28... gxh5 29.Qf6#. C.4) 26... Kxh5 27.Be2+ Kh6 28.Nxf7#. C.5) 26... Qa1+ 27.Bf1 Nxe5 28.Nxf7+ as in C.2. C.6) 26... Qg4 27.Nxf7+ Kxh5 28.Be2 wins (28... Qxe2 29.Qg5#).

Jul-21-16		lentil: here's an example of my chess analysis skills: After 25. ... Kh6, 26 g6xh5+ Kxh5 27 Qg5#. Even can be amused by this one...

Jul-21-16		Razgriz: Couldn't decide between Qf6+ or h6+ but h6+ didn't have much of a punch and follow up to it.

Jul-21-16		Cheapo by the Dozen: I miscalculated this one from beginning to end. A whiff.

Jul-21-16		Longview: <cheaper> right there beside you. got the first move as one of my two candidates but picked the other. Calculations to varied for me. I thought the King would not go to that square in response to Qf6. Liked the trade bishops offer (26.Nd6)

Jul-21-16		kevin86: I missed the gymnastics by the queen and knight. Good finish!

Jul-21-16		Jimfromprovidence: I got 25 Qf6+ Kg8 26 Nd6 Qa1+ (not 26... Nxe5??) 27 Bf1 (not Kg2?) Nxe5 28 Nxb7 Qd4. (28...Qd4 anticipates 29 Nd8.) click for larger view 29 Nd8 Nf3+ 30 Qxf3 Qxd8 follows. click for larger view

Jul-21-16		YouRang: <ventricule: Interesting, I also wanted to go for <26. ... Kh6 27. g4> , but this actually does not work. Black can simply take the bishop <27. ... Qxd3> and hide on g4 : <28. g5+ Kxh6 29. Ng3+ Kg4>. There's no mate!> I think your have some typos in your numbers and moves? I assume you mean <25...Kh6 26.g4 Qxd3 27.g5+ Kxh5 28.Ng3+ Kg4> But two problems with this line: (1) After <27...Kxh5> click for larger view Instead of 28.Ng3+?, which allows the K to escape, try <28.Qf4>, which traps the king and threatens Ng3#/Nf6#. (2) White can improve upon the 27th move also: click for larger view Instead of 27.g5+, try <27.hxg6!>, which threatens both g7# and gxf7#. Black has no good way out of this. A fun variation of this line is <27...Qxe4 28.g7+ Qg6 29.g8N#!> click for larger view

Jul-21-16		yadasampati: <Cheapo by the Dozen> Well, at least you were consequent. I give you a credit point for that :-)

Jul-21-16		morfishine: <25.Qf6+> *****

Apr-01-19		N0B0DY: reads your linguistic garbage.

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