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| Dec-12-10 | | mike1: no, did not get it but 35. Qe4 is
not right. There will be several better moves for White, including Kb2 or even Kxb4. |
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Dec-12-10
 | | patzer2: Correction! White doesn't have a material advantage. Black is actually an exchange up. What the combination does is simplify to a Queen and Bishop verus two Rooks and Bishop middle game, which favors Black. P.S.: I can remember playing at least two opponents in tournament play who thought the Queen was more powerful than the two Rooks. When they "forced" that exchange, I won easily with the two rooks. |
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| Dec-12-10 | | Brandon plays: Well, it depends on the position of course. But ultimately the two rooks are a force more powerful than the queen. I saw the first couple of moves. But I didn't get it. |
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Dec-12-10
 | | Jimfromprovidence: Here's the particular position I'm stuck on. 35 Kb2 Rc3 36 Bb5 Bf8 37 Ba4.
click for larger view |
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| Dec-12-10 | | BOSTER: <dzechiel> < It seems like black could try to take advantage by playing 31...Qd5> . After ...Qd5 white simply play 32.Bxc4 and black is not better.
31... Qxc2-this is the only chance for black to try to win. |
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Dec-12-10
 | | agb2002: Black has a rook and a bishop for the bishop pair.
White threatens 32.Bxd3 and the pawn on c4.
The retreat 31... Qf5 repeats the position after 32.Bg4 Qd3 33.Be2 and 31... Qd7 loses a pawn and attacking chances after 32.Bxc4 and gives White some opportunities with f5 and e6 (if ... exf5) or g6 (if ... gxf5). Therefore, 31... Qxc2+ 32.Kxc2 cxb3+:
A) 33.Kb1 bxa2+
A.1) 34.Kxa2 Rxc1 with the plan Bf8, Rc3, Rdc8, b3, etc. Black will probably end up trading his b-pawn and rooks for the white queen and bishop. A.2) 34.Kb2 Rc2+ 35.Ka1 Rxc1+ 36.Kxa2 Rd2+ 37.Kb3 Rc3+ 38.Ka4 (38.Kxb4 Rcc2 39.Qa8+ Bf8+ 40.Kb5 Rxe2 - +) Ra3+ 39.Kxb4 (39.Kb5 Raa2 followed by Rxe2) Bf8+ 40.Kc4 Raa2 - +. B) 33.Kb2 bxa2
B.1) 34.Kxa2 Rxc1 transposes to A.1.
B.2) 34.Be3 Rc2+ 35.Ka1 (35.Kxc2 a1=Q - + [R+P vs B]) Rd1+ 36.Bxd1 Rxg2 - + (37.Bb3 Rg3 wins a bishop). B.3) 34.Qf1 Rc2+ 35.Ka1 b3 with the threat 36... b2+ 37.Bxb2 Rdd2 (36.Bd3 Rxd3 wins). B.4) 34.Qg(h)1 Rc2+ 35.Ka1 Rxe2 - + [2R+2P vs Q].
C) 33.Kxb3 Rxc1
C.1) 34.Kxb4 Rb8+
C.1.a) 35.Bb5 Rb1+ wins.
C.1.b) 35.Ka3 Bf8+ 36.Ka4 Rc2 - +.
C.1.c) 35.Ka4(5) Rc2 - +.
C.2) 34.f5 exf5 35.e6 fxe6 36.Bc4 Rc3+ 37.Kxb4 Rd4 38.Qa8+ Kh7 39.Qh1+, draw. I don't know, but I think I would try 31... Qxc2+. |
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Dec-12-10
 | | Phony Benoni: <JimfromProvidence> In your second post, after 31...Qxc2+ 32.Kxc2 cxb3+ 33.Kxb3 Rxc1 34.Kb2 Rc3 35.Bb5 Bf8 36.Ba4:
click for larger viewHow about 36...Bc5, with ideas like 37...Bd4 or 37...Be3? As long as Black plays on the dark squares, White has trouble defending. |
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| Dec-12-10 | | rilkefan: Why not 34...Rdc8? And if 35.Bd3 then ...b4 and the bishop will come to c3. In the above diagram, looks to me like ...Rd4 is also a threat, esp. in association with ...Bc5. |
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Dec-12-10
 | | scormus: <Phony Benoni: <JimfromProvidence> 36 ... Bc5> I was thinking this must be the way, but its not a quick win. But 2R vs. Q and more play, surely B is winning, eventually. I think the quick win in the game was because of Ka4? With the best defense theres more work for B. A tough Sunday puzzle. <David2009> you said there was a clear winning strategy. Please put us out of our misery and post it ... so I can sleep easy tonight! |
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Dec-12-10
| | Jimfromprovidence: <Phony Benoni> <In your second post, after 31...Qxc2+ 32.Kxc2 cxb3+ 33.Kxb3 Rxc1 34.Kb2 Rc3 35.Bb5 Bf8 36.Ba4: How about 36...Bc5, with ideas like 37...Bd4 or 37...Be3? As long as Black plays on the dark squares, White has trouble defending.> I really like your 36...Bc5, below, with the idea of 37...Be3 followed by 38...Rd2+.
click for larger view That looks difficult to stop. White's queen can't abandon the second rank (he has to protect against ...Rd2+), so his position is pretty much tied up. |
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| Dec-12-10 | | rilkefan: I was able (after about ten tries) to beat the endgame trainer by the plan of doubling on the c file then doubling on the third rank, attacking f4, playing Bf8, Kg7, Bc5, and (maybe because it was tired of showing me up) winning f4 and trading the R+B for the Q on c1. |
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Dec-12-10
| | scormus: <Phony Benoni, Jim .... Bf5!> Yes, thats the move. W can try f5 but if B does not play rashly, he'll win. You've cracked it. |
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| Dec-12-10 | | David2009: <scormus: [snip] <David2009> you said there was a clear winning strategy. Please put us out of our misery and post it ... so I can sleep easy tonight!>
Try defending as White against Crafty End Game trainer in the following link:
http://www.chessvideos.tv/endgame-t...
You will find that (after preparation) the EGT doubles Rooks on the fourth rank and snaffles the f4 Pawn. White is curiously helpless against this strategy. Other Pawns then fall like ripe fruit. I spent a long time trying to win the colours-reversed position by direct attack. Once my Bishop had left its coloured-reversed haven on f1,
it exposed me to sacrificial counter-stroke of B takes a Pawn and the Q infiltrating with perpetual check (or even worse in one instance!)
The colours-reversed link is in my earlier post S Marder vs J Dlugosz, 2007 |
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| Dec-12-10 | | wals: Got it, the first time in living memory.
Rybka 4 x 64 blunders only
depth: 24 : 15 min :
White
(-3.05):31.Be2. Best, Be4, -1.45.
1.  (-1.45): 31.Be4 Qd7 32.bxc4 Qd4 33.Bc6 Qc5 34.Bb5 Rd3 35.Qf2 Bf8 36.Qxc5 Bxc5 37.Ba4 Kg7 38.Re2 Rh8 39.Bd2 Rdh3 40.Kc2 Rh2 41.Rxh2 Rxh2 42.Kd3 Kf8 43.Bb3 Ke7 44.Bd1 Rh3+ 45.Ke4 Rh1 46.Bb3 depth: 24 : 4 min :
White
(-6.45):35.Qe4. Best, Kb2, - 3.07.
depth: 23 : 4 min :
(-12.62):37.Ka4, Best, Kb2, -6.45.
White resigned after move.41...Rxf7. |
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| Dec-12-10 | | AGOJ: I wonder whether 31.Be4 would have been better for White. As for the puzzle itself (which I missed), I really liked the cool 39...b3. |
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| Dec-12-10 | | WhiteRook48: i believed the answer was ...cxb3 |
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| Dec-12-10 | | zenpharaohs: I've done quite badly with the chessgames puzzles the past few weeks (oddly enough I'm doing well in other chess puzzles I do). But I got this one. The key to seeing the first move was that White is really lacking tools with that rook off the board, and Black's queen is a bit awkward; but Black's twin rooks are well placed to exploit the disruption of White's Queen side. Since it's opposite side castling, the game is likely to go to the player who can bring the soonest credible attack, and Black's advanced Queen side pawns made it clear that some such plan was unfolding. The only move that fit that bill seems to be the exchange sac. |
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| Dec-12-10 | | CapablancaFan122: Hmm, I think I got this: I found the initial <Qxc2+> followed by <cxb3+>, but instead of <33.Kb2>, I went with <33.Kxb3 Rxc1>. But I guess the actual continuation is not so different than from the line I analyzed. In any case I don't see why black had given up on his material advantage. |
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| Dec-12-10 | | TheBish: S Marder vs J Dlugosz, 2007 Black to play (31...?) "Insane"
I got this one, but of course I should... because I've seen it before! No "points" I guess (for those keeping score), so I'll just enjoy the game! |
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| Dec-13-10 | | Jambow: I dunno but I saw 31...Qxc2+ 32.Kxc2...bxa2 33.Kxa2...Rxc1 and I like black here I must be missing something simple? |
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| Dec-13-10 | | knight knight: I've had a busy weekend so I didn't view Saturday's puzzle, and am late for Sunday but here goes... Black's an exchange ahead but about to lose the c-pawn. 31...cxb3 is an interesting candidate, but after 32. Bxd3 bxa2+ 33. Kxa2 b3+ 34. Kxb3 Rxd3+ 35. Kb2 I don't think black's attack is strong enough. Let's go back, try 31...Qxc2+
a) 32. Ka1 Qxc1#
bi) 32. Kxc2 cxb3++ 33. Kb1 bxa2+ 33. Kxa2 Rxc1 winning (33. Kb2 a1=Q+ 34. Kxa1 Rxc1+ winning, 33. Ka1 Rxc1+ winning) bii) 32. Kxc2 cxb3++ 33. Kb2 Rc2+ 34. Kb1 bxa2+! 35. Ka1 (35. Kxc2 a1=Q winning) Rxc1+ winning Is that it? Must be missing something! Oh well that's my effort, time to check... |
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| Dec-13-10 | | knight knight: Hmmm, missed 34. Kxb3, but got the right idea. |
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Dec-13-10
| | patzer2: <JimfromProvidence> After 31...Qxc2+ 32.Kxc2 cxb3+ 33.Kxb3 Rxc1 34.Kb2 Rc3 35.Bb5 Bf8 36.Ba4:
click for larger view<Phony Benoni>'s 36...Bc5! might be best. However, I like 36...Rd4! Playing it out move-by-move on Fritz 10, Black is easily winning after 31...Qxc2+!! 32. Kxc2 cxb3+ 33. Kxb3 Rxc1 34. Kb2 Rc3 35. Bb5 Bf8 36. Ba4 Rd4! 37. f5 exf5 38. Bb3 Re4 39. Qd2 Rxe5 40. Kb1 Re4 41. Qd5 Re1+ 42. Kb2 Re7 . |
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Dec-13-10
| | scormus: <David2009> Neat, or should I say "Crafty" |
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Dec-13-10
| | Phony Benoni: <patzer2> No doubt, there's more than one way to Marder this particular cat. I think the important thing to recognize is that Black has the potential for a strong attack, holding strong postionaal/dynamic trumps with material equality. |
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Kibitzing
sac: 31...Qxc2+