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| Jun-11-10 | | Brandon plays: Ok, I must admit that I saw the back rank threat. I saw that black's queen must somehow be deflected. I briefly considered Qxf3, but I thought that this didn't win material. Obviously my calculation skills are not up to par. |
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| Jun-11-10 | | fernandojaume: A OPTION
ASI:
29... Bd4
30 Qe7 Bxf2+
31 Kh1 Bxe1
32 Bxe1 Rc1
33 Bxd7 g6
34 Kh2 Rc2
AND
29... Bd4
30 Qe7 Bxf2+
31 Kxf2 Qxd2+
32 Qe2 Qd4+
33 Kf1 Qf4+ |
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Jun-11-10
 | | chrisowen: I'm a fan dang of really the queen's trade over white's line, and your plan is afoot. Fault rests trapping in Qb7 I believe. Qf3 Dueball fly, squashing black currently cramped for space. Often issue back rank mate, carded rook leaves, there's a sport. In gesture, white flags up Rc6, Re8 reignites the fallback. Black defence king is getting stripped. After h5 pro cull heads up larger bench rook takes threatening mate. Rc6 choice it pale in comparison got queen exchange? Waddle the wedged rook up grips light. With the niceties skipped white mates him. |
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| Jun-11-10 | | lzromeu: So easy: deflect the Queen and the black position is lost.
But I blunder it.
If black acept the Queen's exchange, white win material advantage - bishop pair against single bishop + 2 pawns plus. Minimun advantage for white in best way for black |
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Jun-11-10
 | | Once: This is one of those extremely annoying puzzles which is quite easy when you see it ... ... but extremely difficult if you don't.
How many of us have bruised foreheads today? I know that I do. And how many of us have wives, girlfriends, husbands, etc who think we are imitating Homer Simpson through our heartfelt cries of "doh!" ?? |
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Jun-11-10
 | | Jimfromprovidence: I got the same thing as <agb2002>, 30 Qe4 Qc7 31 Qf5.
click for larger view White double attacks the knight and keeps the back rank mate threat going as well. Black has nothing to either protect the knight or to counterattack with. For example, if black tries something like 31...Bc3?!, then white wins with 32 Re7! 
click for larger view |
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| Jun-11-10 | | cjgone: I chose Qe4.. Does it matter, I played against Rybka and it says i'm at a serious advantage atm. |
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| Jun-11-10 | | tacticalmonster: Here is a possible defense to 31 Qf5
a) 30 Qe4 Qc7 31 Qf5 h5! 32 Rc1! ( any other moves Black equalizes) Qxc1+ 33 Bxc1 Rxc1+ 32 Kh2 hxg4 33 Qxd7 Be5+ 34 g3 Rc3! Black is worse but with some chances to hold. But b) 30 Qe4 Qc7 31 Rc1! Qd8 32 Rxc8 Qxc8 33 Qf5 White is up a piece |
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Jun-11-10
| | Jimfromprovidence: <tacticalmonster> <Here is a possible defense to 31 Qf5 a) 30 Qe4 Qc7 31 Qf5 h5!>
The situation holds. 32 Qxd7 comes next and wins a piece. If black is thinking 32...hxg4, then 33 Re8+ Rxe8 34 Qxc7. 
click for larger view |
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| Jun-11-10 | | jheiner: Friday. 30. White to play. Difficulty: "Difficult"
Material. B for N and P. No pieces hanging or threatened. White has luft. Batteries: Q+R on the e file, and Q+B on c1-h6 diagonal. N on d7 is pinned. Rc8 and Nd7 are responsible for protecting against back rank mate. After looking at the position for awhile, I realize I am just trying various combinations trying to "make something work." The obvious sac's to try to force mate on e8 fail. (30.Qe8+ Rxe8 31.Rxe8+ Nxf8 or 30.Bxd7 Qxd7 31.Qe8+ Rxe8  ) And flailing and guessing at lines isn't working. Let's look deeper into the position.
White has the B pair, but down a P doesn't help, and the B are not on their best squares. White has the light B so perhaps we could launch an attack on light squares e6, f7. Moreover, the Black Q does not have too many squares to move to. In fact, the Black Q has to stay on the 7th rank or drop the Nd7. Theme: Trapping the Queen (or Badly placed Queen)
Candidates: Qe4, Qf3, Bf3
30. Qe4 ...
31. ... Qxe4 31. Rxe4 Rd8 32.Bxd7 (Rxd7 33.Re8#) 
31. ... Qa7 (if Qb6 32.Bxd7) 32.Be3 Qc7 33.Rc1
31. ... Qc7 32.Rc1 Qa7 33.Be3
That looks correct. Now that we've found a good move, let's look for a better move. 30.Qf3 (same as above, but if Qxf3, then gxf3 is not as awesome)
30.Bf3 Qc7 31.Rc1 fails to Qd8
None found. This looks good. The theme is more Removing/Dislodging the Defender, but seeing that the Q was badly place was my visual trigger. Time to check.
Hmmm, 30. Qe4 Rc6 (does not allow Re8+ as in the game, however) 31. Bxd7 wins a piece since 31...Qxd7 32.Qe8+ Qxe8 33.Rxe8# Checking the kibitzing. HA!! I see that Once put it through Fritz and 30.Qe4 is the best move. I am going to be smiling all day now. |
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| Jun-11-10 | | jheiner: Bah. Looking deeper, my analysis has holes. No partial credit in chess when you can lose the game in a single mistep! 30. Qe4 ...
31. ... Qc7 32.Rc1? Qd8
Oddly, I caught that line in my Bf3 analysis. Correct was 32.Qf5! Thanks <agb2002> and <Jimfromprovidence>. And lastly, I skipped both the defenses 31...Rc6 and 31...d5 in my evaluation. Today was a great puzzle. Looks like a lot of people banged their head on this one. I particularly like this because the position looks SO QUIET at first. And this is similar probably to positions one sees frequently OTB in the late middle game. |
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| Jun-11-10 | | fernandojaume: OTRA ASI:
29... Bd4
30 Qe7 Bxf2+
31 Kxf2 Rc2
32 Re2 Rxd2
33 Qxd7 Qd4+
34 Kf1 |
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| Jun-11-10 | | Malcoda: Perhaps I am overlooking something here, as I have just recently started playing chess again. But why would black play 32.).., H5 rather than playing 32.)...., GxF6 and taking the queen. It still opens up the king for escape and the queen is removed. Anybody care to explain it? |
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| Jun-11-10 | | jheiner: <Malcoda> Valid question. It's subtle unless you're familiar with this mating pattern. 32...gxf6 33.Bh6 threatens 34.Rxf8#
Black can't do anything about it. The Bg4 almost magically prevents any sane defense. Try: Qb8, Qc8, Rc8, Qe7, Rc1+... |
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| Jun-11-10 | | fernandojaume: POR EXAMPLE...
SI...
30 Qe2/Qg3, f5 |
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| Jun-11-10 | | fernandojaume: POR EXAMPLE...
SI 29...Bd4
30 Qg3 Be5 |
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| Jun-11-10 | | Malcoda: <jheiner> That makes complete sense, looking back again I should have caught that. Thanks very much for explaining. |
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| Jun-11-10 | | The Rocket: awesome way to win the game for white |
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| Jun-11-10 | | zanshin: Missed it! Great play by White. Who could have spotted <29...Qb7> as the losing move? |
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| Jun-11-10 | | DarthStapler: I didn't get it |
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| Jun-11-10 | | johnlspouge: Friday (Difficult)
J Dueball vs E Gereben, 1972 (30.?) White to play and win.
Material: B for N+P. The Black Kg8 has 2 legal moves and is vulnerable to back-rank mate. The White battery Qe3 and Re1 can invade at e8, so the Rc8 and Nd7 both bear an absolute burden in the sequence 30.Qe8+ Rxe8 31.Rxe8+ Nf8. The White Bg4 can capture Nd7, but then the defender Qb7 replacing Nd7 also defends against the mating sequence. The candidate should overload a burdened Black piece, but which one? The White Kg1 is secured from check. Candidates (30.): Qf3
30.Qf3 (threatening 31.Qxb7 or 31.Bxd7)
(1) 30…Qa7 31.Be3 Qc7 [Bd4 32.Bxd4 Qxd4 33.Bxd7]
Variation 1 is now essentially the same as Variation 2. (2) 30…Qc7 31.Rc1 (threatening 32.Rxc7)
31…Qd8 [Qxc1 32.Bxc1 Rxc1+ 33.Kh2 leaves Black down R+B for Q] [else, drop Q, R, or N] 32.Rxc8 Qxc8 33.Qf5
The White battery Bg4 and Qf5 pins Nd7 to Qc8 and wins it. (3) 30...Qxf3 31.gxf3 (threatening 32.Bxd7)
The White Bg4 pins Nd7 to Rc8, so Rc8 must protect Nd7. The Black Rc8 also bears the burden of preventing Re1-e8+, however: 31...Rd8 32.Bxd7
Black may not recapture, because of 33.Re8+, so White is up a B. I missed the game defense, which was very pretty in its refutation. |
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| Jun-11-10 | | johnlspouge: In my Variation (2), 31.Rc1 wins, but it is not as strong as 31.Qf5 as <agb2002> and others suggested. |
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| Jun-11-10 | | zooter: absolutely missed it. In fact after looking at the game, it took me a while to figure out 32.Qxf6 gxf6 mates with 33.Bh6 (please correct me if i'm wrong) |
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| Jun-11-10 | | turbo231: Too difficult for me. |
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| Jun-12-10 | | newzild: Missed it. |
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Kibitzing
