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| Sep-06-09 | | VishyAnandFan: i think jim is right, after 21.0-0-0
white is better than in the game continuation |
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| Sep-06-09 | | lost in space: 21. 0-0-0 (instead of Bd2) is Rybkas first choice,
but after
21. 0-0-0 Nxf3 22. gxf3 Bxf3 23. Qd2 Rfc8 24. Bc2 Rab8 24. bd4 e5 (Rybka) Black has a pantastic position, enough to win easily (-2,3) 
click for larger view |
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| Sep-06-09 | | Once: Pins everywhere today. Not too hard to see the continuation, as long as we can avoid the temptations of alternative moves. From the starting position, I have two fantasies - one is to hit the pinned Nc3 and the other is to clobber the pinned Nf3. The Nc3 pin is absolute, but I can't see how to get at it with enough bits. And this being a puzzle position, I don't know if 0-0-0 is legal. So hitting Nf3 seems to appeal most. A knight reloader on e5 seems the best way forward. Can't claim to have seen all the variations, but I'm happy I got enough in the brief time I allowed myself. A better end to a pretty dismal week for me. |
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| Sep-06-09 | | DarthStapler: I got the first move and considered the second move |
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| Sep-06-09 | | Eisenheim: This puzzle has some a few fun concepts in it. I immediately looked to the f-file where I wanted to sac the RxN, the recapture with the B and fork the Q/R, however I realize I need another piece to support the exchange. The C4 knight needs to be used ASAP or it loses its attacking luster, so if Nxe5, dxe5, then Nxe5 looks great to smash open the center, thanks to the fun pin on F3, whites efforts to recapture are stymied. I now still attack and control the center and no matter what white plays now, I can additionally smash their defenses with the RxN I originally wanted to play. Wanted to show my thinking bc I kind of worked backwards here, or rather visualized where I wanted to go and then mapped out how to get there. |
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| Sep-06-09 | | Once: <Eisenheim> Great post! Totally agree about working backwards. Solving chess puzzles can sometimes be like solving a jigsaw puzzle. You know that you want to play Rxf3 and Nxe5, but initially you don't know where they fit in the sequence. So you need to try various permutations (or should that be combinations?) until you find a sequence that fits. |
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| Sep-06-09 | | johnlspouge: Sunday (Insane):
Rozentalis vs Bologan, 1995 (19...?) Black to play and win.
Material: Down a P. The White Ke1 has 2 legal moves, both on the back rank. The Black Qa5 pins Nc3 to Ke1. The Black Bg4 pins Nf3 to Qe2, while Rf8 also attacks Nf3. The Black Nc4 can capture Be3. Black attacks Pe5 with 3 pieces (Nc6, Nc4, and Bg7); White defends Pe5 with 2 units (the pinned Nf3 and Pd4). The closed P center hampers the Black army, which control more space than the White army. Capture of Pe5 is therefore attractive, although exposure of Pe6 could create counterplay, giving Bg4 a defensive task. In any case, the candidate is therefore likely to exploit the White weaknesses on e5, f3, and c3 (probably in order of importance). The Black Kg8 is secured from check, although White has the seeds of a counter-attack in the semi-open h-file for Rh1. Candidates (19...): N6xe5, Bxe5, N4xe5
19…N6xe5
(threatening 20…Nxf3+ 21.gxf3 Bxf3 winning more material) <[Toga prefers N6xe5 to N4xe5. I chose to capture with Nc6 instead of Nc4, because I wanted to activate Nc6.]> 20.dxe5 [else, drop at least a P]
<[Here, I went for 20…Bxe5, overlooking that in the variation 21.Bxc4 Bxc3+ 22.bxc3 Qxc3+ then 23…Qxa1+, White does not need to capture with 22.bxc3 quite so agreeably, but can move 22.Kf1 instead, retaining a P up.]> |
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| Sep-06-09 | | johnlspouge: < <Once> wrote: [snip] you need to try various permutations (or should that be combinations?) until you find a sequence that fits. > Hi, <Once>. If order matters, it is a permutation :) We have found an interesting shibboleth for those who aced their A-level maths ;>) |
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| Sep-06-09 | | Helios727: So did white resign for being 2 pawns down, or is there something more crushing coming soon? |
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| Sep-06-09 | | znsprdx: aw shucks.... if it were white to play Rxh7 looks so sweet....:) I need more coffee...one would have to see ...21. Rxf3[N]: very pretty and efficient indeed! |
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| Sep-06-09 | | remolino: Did not get this one. See you next week (tomorrow). Remolino. |
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| Sep-06-09 | | Once: <johnlspouge> Sir, you have evoked a memory long buried! Permutations and combinations, possibilities and probabilities. Heck, that takes me back. As I recall, it was all about different coloured balls in bags and an unhealthy interest in young boys' sock drawers. Now founds a use in backgammon, monopoly, poker and warhammer, but not much else. Odd what stuff we learn and rarely use again ... |
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Sep-06-09
 | | LIFE Master AJ: I nailed this one completely. After about 30 minutes of analysis, I even decided that it did not matter too much which Knight took on e5, and the computer does not show much difference either. (Either way White must take, and then Black captures with the other Knight.) As <OBIT> already noted, Black wins by putting max pressure on f3. I have already annotated this game. When I get back from Chess Club tonight, (our CC meets on Sundays and Thursdays); I will knock out the web page. |
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Sep-06-09
| | LIFE Master AJ: Sorry for such a brief post - esp. on a Sunday - but other persons have already elaborated the problem, I would just be repeating most of what has already been stated. |
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| Sep-06-09 | | David2009: Sunday's puzzle Rozentalis vs Bologan, 1995 Black to play 19...? Insane Black has sacrificed a Pawn to reach a dynamic position with attacking chances. He can liquidate
into at worst a favourable ending starting 19...Bxf3 20 gxf3 Bxe5 21 dxe5 d4. For example 22 Bd2 Nxd2 23 Qxd2 dxc3 24 Qxc3 Qxc3 25 bxc3 Nxe5 26 Be4 Nxf3+ 27 Ke2 Nd4+ and Black is a Pawn up in a favourable ending.
Time to check:
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Black chose the much better continuation 19...N4xe5 20 dxe5 Nxe5 21 Bd2 Rxf3 22 gxf3 Bxf3
reaching an ending two pawns up (rather than one pawn up as in my main line). Checking my proposed line over the board, I notice 19...Bxf3 20 gxf3 Bxe5 comes close to being a losing blunder because of 21 Bxc4 apparently winning a piece.
Fortunately for me 21...Nxd4 22 Bxd4 Bxd4 wins the piece back after all because of the pressure on c3.
Unless kibitzers have other ideas? |
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| Sep-06-09 | | David2009: <Helios727: So did white resign for being 2 pawns down, or is there something more crushing coming soon?>
Black can play Bf5 followed by d4 with a winning attack. You can try this plan out using the link below (colours have been reversed):
http://www.chessvideos.tv/endgame-t... Good luck! |
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| Sep-06-09 | | wals: [Event "Belfort"]
[Site "Belfort"]
[Date "1995.??.??"]
[Round "9"]
[White "Eduardas Rozentalis"]
[Black "Viktor Bologan"]
[Result "0-1"]
[ECO "B22"]
[WhiteElo "2588"]
[BlackElo "2689"]
[Annotator "Rybka 3 1-cpu (30m)"]
[PlyCount "52"]
♗22: Sicilian: 2 c3
1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 Nc6 5. Bc4 Nb6 6. Bb3
g6 7. d4 cxd4 8. cxd4 Bg7 9. Nc3 O-O 10. h4 d5 (10... d6 11. e6 d5 12. exf7+
Rxf7 13. h5 Bg4) 11. h5 Bg4 12. hxg6 (12. h6 Bh8 ) 12... fxg6 13.
Be3 (13. Qd3 Bf5 14. Qd1 Nb4 ) 13... a5 (13... e6 14. Qe2 ) 14. a3
Secures b4 (14. Qe2 e6 ) 14... e6 White has a very active position 15.
Qe2 (15. Rc1 a4 16. Bxa4 Nxa4 17. Nxa4 Qa5+ 18. Nc3 b5 ) 15... a4 16.
Bc2 (16. Ba2 Na5) 16... Nc4 ♗lack threatens to win material: ♘c4xb2 17.
Bd3 (17. Bxa4 N6xe5 18. dxe5 Nxe5 ) 17... b5 (17... N4xe5 18. dxe5 Nxe5 )
18. Nxb5 ? <dubious> (18. Kf1 and White can hope to survive) 18... Qa5+
19. Nc3 N4xe5 (19... N6xe5 20. dxe5 Nxe5 21. Qc2 Bxf3 22. Kf1 ) 20. dxe5
Nxe5 21. Bd2 ? <dubious> (21. Qd2 Bxf3 22. Bf1 ) 21... Rxf3 (21... Bxf3 22.
gxf3 Rxf3 23. Bc2 ) 22. gxf3 Bxf3 23. Qf1 Bxh1 24. O-O-O (24. Qh3 doesn't
get the bull off the ice Nxd3+ 25. Qxd3 d4) 24... Bf3 (24... Bg2 makes
it even easier for ♗lack 25. Qxg2 Nxd3+ 26. Kc2 Nxb2 27. Kxb2 Qb6+ 28. Kc2
Qb3+ 29. Kd3 Bxc3 30. Ke2 Qc4+ 31. Ke1 Bxd2+ 32. Rxd2 ) 25. Re1 (25. Be2
doesn't change anything anymore d4 26. Kb1 dxc3 27. Bxc3 Be4+ 28. Ka1 Qb6 )
25... Nxd3+ (25... d4 and ♗lack can already relax 26. Bc2 dxc3 27. Bxc3 )
26. Qxd3 Bg4 ( <-4.77> 26... Bg4 27. Qg3 Bf5 ) 0-1 The above may be of interest to those seeking help. |
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| Sep-06-09 | | alphee: It was intersting to see that white could still castle, long or short. My assumption was it would be short, hence attacking the king side could be an option as doubling the rooks on the B column did not bring a lot.
e5 was my first target and my plan did not use the knight on c4 but the g8 bishop, leading to 22... ♗xe5 23. dxe5 ♘xe5 24.♗c2 ♗xf3 25. gxf3 ♘xf3+ 26. ♕xf3 ♖xf3 or something similar |
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| Sep-06-09 | | WhiteRook48: I chose 19...N6xe5 instead! but ultimately it amounts to the same thing |
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| Sep-06-09 | | CHESSTTCAMPS: Black is a pawn down, but has grabbed a space advantage and a development advantage in this e5-pawn chain formation. Key trouble spots for white include the uncastled king (hence unconnected rooks), strong pins on both white knights, and control of open lines by black. White threatens Bxc4, knocking out a key attacker and taking control of e4. For black, the pin on Nf3 suggests a demolition sac on e5, breaking up white's center, unleasing the black DSB, and reinforcing the attacks on c3 and f3. My first inclination was 19...N6xe5 20.dxe5 Bxe5, but a look at the tactics shows that the more accessible high-value target is f3. 19... N4xe5
Why even allow the option of Bxc4? Exchanging pieces is to white's benefit. 20.dxe5 Nxe5! (d4? 21.Bd2 dxc3 22.Bxc3 kills the black initiative) and now: A) 21.Bd2 Rxf3! 22.gxf3 Bxf3+ 23.Qf1 Bxh1 and white has regained the sacrificed piece with a 2 pawn advantage and a more secure king position. A.1) 24.O-O-O Bg2! 25.Qxg2 (Qe2 Bf3 wins the exchange) Nxd3+ 26.Kc2 Nxb2! 27.Kxb2 Qb6+ is a quick win. A.2) 24.Ne4? Nxd3+ 25.Qxd3 Bxe4 wins.
A.3) 24.Qxh1 Nxd3+ wins easily
A.4) 24.Bb1/c2 Bf3 with a dominating position.
B) 21.Rc1 Nxf3+ 22.gxf3 Bxf3 23.Qf1 Bxh1 24.Qxh1 d4 is crushing. C) 21.Qc2 Bxf3 22.gxf3 Nxg3+ followed by d4 should do the trick. |
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| Sep-06-09 | | CHESSTTCAMPS: <C) 21.Qc2 Bxf3 22.gxf3 Nxg3+ followed by d4 should do the trick.> Obviously Nxf3+ was intended here.
My line A.1 matches the game line up until O-O-O, but diverges with 24... Bg2, which is completely sound and works just as well as Bf3. Chessmaster prefers 24...d4 to both of these alternatives, but black is in complete control regardless. |
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| Sep-06-09 | | TheMacMan: i N4xe5 in less than 20 seconds... |
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| Sep-07-09 | | TheBish: Rozentalis vs Bologan, 1995 Black to play (19...?) "Insane"
Material: Black is down a pawn, but his pieces are well placed, and poised to strike the uncastled White camp. With the bishop pinning the knight to White's queen, a piece sacrifice on e5 is suggested, to allow a knight to come to e5 to further attack the pinned knight. Candidate moves: Bxe5, N6xe5, N4xe5
19...Bxe5? 20. Bxc4 dxc4 21. Qxc4 Bxf3 22. gxf3 and White will win a piece, as he is attacking two both the knight and bishop. 19...N6xe5! likely transposes to the other knight taking, since the main difference is it allows 20. Bxc4 Nxf3+! when Black wins after either 21. gxf3 Bxf3, 21. Kd1 dxc4 or 21. Kf1 Nh2+ (or simply 21...dxc4). One reason to take with the other knight is to threaten d5-d4, but this turns out not to be best anyway. 19...N4xe5! was my main focus, since at first I thought that 19...N6xe5 20. Bxc4 Nxc4 only won a pawn, but I improved on that (see above). Now forced is 20. dxe5 Nxe5 (much better than 20...d4? 21. Bd2 dxc3 22. Bxc3) and now: A) 21. 0-0 Rxf3! (or 21...Nxf3+ 22. gxf3 Bxf3 23. Qd2 d4 24. Nb5 dxe3) 22. Bd4 Rxd3 23. f3 Nxf3+ 24. gxf3 Bxd4+ 25. Kg2 Bf5 and Black is up a piece and two pawns with an easy win. B) 21. Rh4 (or Rh2) Bxf3 is easy, since 22. gxf3 Nxf3+ wins the rook. C) 21. Qd2 Bxf3 is the same idea as B, since 22. gxf3 is not good due to the pawn fork. D) 21. Qc2 Bxf3 wins the piece back with interest (two pawns, netting one), since 22. gxf3 (or 22. Bd4 Bxg2 and 23...Nf3+) Nxf3+ 23. Ke2 d4 24. Ne4 dxe3 25. fxe3 leaves Black up a pawn, with a seriously exposed White king to attack. |
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| Sep-07-09 | | TheBish: I forgot to analyze 21. 0-0-0 (although looked at 21. 0-0). I was analyzing with the help of Gameknot's practice board (which helps me with the annotating), but doesn't allow castling when setting up a position! (Unlike Fritz and others, where you can check a box for 0-0 or 0-0-0 if it's legal.) So I set up the position after 21. 0-0, and it didn't occur to me that queenside castling was an option too. Luckily, it wasn't a game changer. |
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Sep-07-09
| | LIFE Master AJ: I have (finally!) finished my annotations to this game. http://www.geocities.com/lifemaster... http://www.ajschess.com/lifemastera...
Check it out! (I would also appreciate any feedback.) |
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Kibitzing
Annotations by 
sac: 21...Rxf3
