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Tibor Tolnai vs Janis Yanovich Klovans
Vienna op (1991), Vienna AUT, rd 6, Oct-??
Spanish Game: Closed Variations. Flohr System (C92)  ·  0-1



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sac: 34...Rxf2+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Apr-19-08  akatombo: Why not 41...Bf2?
Apr-19-08  Lightboxes: Good catch...
41...Bf2 looks good to me.

Almost seems like black was in the momentum of wanting the queen to gaurantee a safer win and not deviating. But that does not seem characteristic of good chess players.

Apr-19-08  aazqua: Yep. ALl in all this was an easy one for a Saturday.
Premium Chessgames Member
  patzer2: For today's difficult Saturday puzzle, Black gets to "double his pleasure and double his fun" with a pair of double attacks initiated after the forcing 31...d5!! 32. Bxd5 Qb1+ 33. Kh2 Bd6+ 34. g3.

The first double attack begins with the sham sacrifice 34...Rxf2+!, which forces the Queen to recapture with 35. Qxf2 and give up her guard of the Bishop. The second double attack immediately follows with the Bishop's capture (35...Bxd5 ), when Black simultaneously threatens mate ( 36...Qh1# ) or the capture of the Bishop with decisive material advantage (36...Bxd3 ).

After White plays a spite check with 36. Re8+ Kf7 and 37. Rf1 to stop mate, Black captures the targeted Bishop (37...Qxf3 ). With a clear advantage and good technique, Black quickly forces White's resignation.

Premium Chessgames Member
  patzer2: I suppose 41...Bf2! would have probably forced immediate resignation, but with a passed pawn and the Bishop pair for an escort Black's win was never in doubt after 41...Qxf1 .
Apr-19-08  goodevans: Got it! At least I got as far as far as 35 ... Bxd5 and saw that black would pick up the knight for a material advantage, which is good enough for me.

Perhaps this was a bit easy for a Saturday. I'll read through the other posts now and see how others feel.

Apr-19-08  Samagonka: Fairly solvable for a Saturday, or am I getting better? I got the first 3 moves without difficulty.
Apr-19-08  234: Friday puzzle <28. ?> Apr-18-08 K Burger vs P Keglevic, 1977
Apr-19-08  D.Observer: The only thing I saw here is 31. ... Bxb3, but still merging with the main line.
Apr-19-08  babakova: Got it...Was pretty pleased when I found Rxf2 and that it holds up. Basically it came down to realizing the king was boxed in after the Qg1 defence and whites pieces are very poorly coordinated.
Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult): Black to play and win.

Material: B for N. Black has a battery Ra2 and Qb2 on the 2-nd rank. The White Qf3 and Kg2 must protect Pf2 against the battery. The White battery Qf3 and Re3 protects Nb3, which cannot move. Black has 2 mobile passed Ps, Pb5 and Pd6, supported by 2 Bs, Bf8 and Bf7, but the Bs need activation with ...d5.

Candidates (31…): Bxb3, Qe5, Ra3, d5

31…d5 32.Bxd5 [else, lose material]

32…Qb1+ 33.Kh2 Bd6+ 34.g3 Rxf2+ 35.Qxf2 Bxd5 (threatening 36…Qh1#)

White has a spite check Re8+, but must eventually interpose at e1.

(1) 36.Qe1 Qxe1 37.Rxe1 Bxb3

(2) 36.Re1 Qxb3

In both cases, Black has 2Bs vs. R+P, but easily wins the game with the passer Pb5. In essence, 31…d5 is <strategic>, because it opens the game decisively for the 2 Black Bs. Because it is <tactically> feasible, it wins.

Apr-19-08  TheCap: I had Ra3 picking up the Knight.
Premium Chessgames Member
  johnlspouge: Here are the Mom-and-Pop Toga II 1.3.1 evaluations of the <candidates for move 31...>, in the order I gave them. The values are for White, so only 31...d5 favors Black. Today's position was easy for a computer, so I could have run the analyses longer than I did, but I have a pressing engagement (with my mother)...

[ply 15/44, time 01:04, value +0.84]

31…<Bxb3> 32.Rxb3 Qe5 33.g4 Rd2 34.Rd3 Rxd3 35.Bxd3 d5 36.Bxb5 Bd6 37.Bc6 d4 38.Bd5+ Kh8 39.Kf1 Qf4 40.Qxf4 Bxf4 41.Ke2 Kh7 42.Kd3 Be5 43.f4

[ply 15/40, time 00:09, value +1.53]

31…<Qe5> 32.Bb1 Rb2 33.Rxe5 Rxb1+ 34.Kh2 dxe5 35.Nd2 Rb2 36.Ne4 b4 37.Qg3 Ra2 38.f6 Kh7 39.Qxe5 b3 40.Qb8 Kg8 41.f4 gxf6 42.Nxf6+ Kg7

[ply 15/46, time 00:29, value +0.30]

31…<Ra3> 32.Bd5 Bxd5 33.Qxd5+ Kh7 34.Qd3 b4 35.f6+ g6 36.Rf3 Qe5 37.h4 Ra2 38.Qe3 Kg8 39.Nc1 Qxe3

[ply 15/49, time 00:25, value -2.08]

31…<d5> 32.Bxd5 Qb1+ 33.Kh2 Bd6+ 34.g3 Rxf2+ 35.Qxf2 Bxd5 36.Rf3 Bxb3 37.Qd4 Be7 38.Rf2 Qe1 39.Qd2 Qxd2 40.Rxd2 b4 41.Kg2 Kf7 42.Kf3 Bc4 43.Rc2 Bd5+ 44.Ke3

Premium Chessgames Member
  kevin86: I missed this one-just a little high on the level for me :(

I did appreciate it,however.

Apr-19-08  piever: Ouch, I got the same line as dzechiel... Unfortunately after 34 .. Qf1?? white has a mate in five :(

Maybe I should be more careful when analyzing variations, fortunately it was only a puzzle, and not a OTB game...

Apr-19-08  Billy Vaughan: I immediately looked at d5, but was unable to continue the line to much success.
Premium Chessgames Member
  Jimfromprovidence: I got through 34 g3, missed 34...Rxf2 as well.

White should have played 31 Rf3, not Qf3.

click for larger view

This move provides ample protection for his f2 pawn and knight and protects against the first rank checks.

Black still does have multiple threats, though.

Premium Chessgames Member
  playground player: It's not even worth mentioning, the move I opted for. I would've worked against an idiot.
Premium Chessgames Member
  patzer2: Oops! Correction to my previous post: After 35...Bxd5! the double attack threat is mate (36...Qh1#) or the capture of the Knight (36...Bxb3 or 37...Qxb3 after the game continuation) with decisive material advantage.
Apr-19-08  PinnedPiece: <al wazir: 41...Bf2 is a more emphatic win and would have made it look as if black knew what he was doing from the start of the combination.> For what its worth, I agree, and was suprised not to see that move as I played along. Although I spent a lot of time initially trying to make 31BXN work...
Premium Chessgames Member
  whiteshark: Pretty neigh, but I missed <34...Rxf2!>. I'm pretty sure I would have found it if the position after 34.g3 would have been the starting point.
Apr-19-08  wals: Static Evaluation: Black has a Bishop pair v a light sq Bishop and a Knight. The open diagonals appear to favour Black. Black has two passed pawns, White 0. Black has three pawn islands, white has one? White has an isolated pawn on f5? Black's King is vulnerable to attacks via the light square diagonals.

Dynamic Evaluation: Some fancy footwork required here but what?

Bf7xc3 leads to Bd5+, Bxb5, Qxd5+, Kh8, Q returns guard duties on f3, pd5.

Reasonable moves, Bxb3, d6-d5, Ra2-a3, Qe5

Candidate move: Qe5,

31. ...Qe5 32.f5-f6 ...d6-d5


Yes, old gimlet eye missed , after Bb1, RxQe5 if Ra2-b2. Still I was poking around where the action was.

Analysis by Fritz 11:

1. (-1.96): 31...d6-d5 32.Be4xd5 Qb2-b1+ 33.Kg1-h2 Bf8-d6+ 34.g2-g3 Ra2xf2+ 35.Qf3xf2 Bf7xd5 36.Re3-f3 Bd5xb3 37.Qf2-d4 Qb1-c2+ 38.Rf3-f2 Qc2-c7 39.Rf2-f3 Bb3-c4 40.Qd4-e4 Qc7-e7 41.Qe4xe7 Bd6xe7 42.Rf3-c3 Kg8-f7 43.Kh2-g2 Kf7-f6 44.g3-g4

2. (-0.29): 31...Kg8-h8 32.Re3-c3 b5-b4 33.Rc3-c8 Kh8-g8 34.Be4-c2 Ra2-a3 35.Qf3-f4 Bf7xb3 36.Qf4xb4 Qb2-a1+ 37.Kg1-h2 Bb3xc2 38.Qb4-c4+ Kg8-h7 39.Rc8xf8 Bc2-b3 40.Qc4-c8 Qa1-e5+ 41.g2-g3 g7-g5 42.Qc8-c7+ Qe5-g7 43.Qc7xd6

(, 20.04.2008)

Apr-19-08  Marmot PFL: Didn't spend enough time on this to see both sacs (work 11 hours today). d5 diverts the bishop and the rook sac is a killer, showing the power of the 2 bishops on adjacent diagonals. Can't complain about losing a game like that, just praise the winner.
Apr-19-08  gprice: Of course once a player sees a clear
win why on earth would he analyze
anything else?
Apr-20-08  malvar: Great combination, I got 31..d5, 32, Bxd5, missed Qb1+. I tried playing it move by move and got most of them out anyway. I did get 34...Rxf2+ but; does, 38...Qa2 still win? Exchange the queens earlier? Perhaps as it was played, black squeezed more out of the position. I can't really say.
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