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| Dec-19-09 | | remolino: I ment:
53...Bxc4 is playable too. After 54.Rxc4, instead of 54...e2 which drops the pawn for nothing, Black can play 54...Bf6+, 55. Kg4 Kg6 (not ...Bg5) |
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| Dec-19-09 | | patzer2: For today's Saturday puzzle, Black is forced to play defense for his 50th move (50...?). But it's not easy. White is threatening mate-in-two (e.g. 50...e2?? 51. Bg5+ Kh5 52. g4# or 52. Bf7#). The clever saving resource Bareev finds is 50...Rh1+!! 51. Kg4 Rxh4+ 52. Kxh4 Bd5! = (draw agreed). The point is that White now has nothing better than a repetition of moves after 53. Rg4 Bc6 54. Rg8 Bd5 = since 53.Bxd5?? e2  gives Black a winning passer. |
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| Dec-19-09 | | Patriot: White has mate threats (51.Bg5+ Kh5 52.Bf7# OR 52.Be2+ Bf3 53.Bxf3# OR 52.g4#) and a loose bishop on a8. There's no time for anything quiet, so the consequences of moves like Rh1+ and Bxg2+ must be examined. First off I think we can rule out 50...Bxg2+ as 51.Rxg2 makes it pointless. So 50...Rh1+ is really the only move. But since it's a puzzle I tried to figure out what happens after that. 50...Rh1+ 51.Kg4 (only move)
The mate threat is "on" again, but this stumped me for a while. 51...Rxh4+ is an obvious try but is it just losing the exchange? That's what I thought at first and so I went down a dead end with 51...Bf3+. But finally I saw it... 51...Rxh4+ 52.Kxh4 Bd5!
This had to be correct as 53.Bxd5?? e2 . I didn't look to see if it is drawing or winning but by the process of elimination that's the only thing black has! It turns out to save the game with a draw. |
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| Dec-19-09 | | johnlspouge: Saturday (Very Difficult)
R Bator vs Bareev, 1987 (50…?) Black to play and draw.
Material: Up a P. The White Kh3 has 1 legal move. Black has an advanced passed P, with the White Bc4 bearing the burden of controlling the stop square e2. The candidate 50…Rd4 attacks Bc4 and Bh4 simultaneously, while removing the final flight square from Kh3. The candidate Bd5 could deflect Bc4. The Black Kh6 is vulnerable to checks from Rg8 and Bh4. White threatens 51.Bg5+ Kh4 52.Bf7# or 52.Be2 Bf3 53.Bxf3#, however, with 52.Be2 also forking Kh4 and Rd1, so any candidate must also have defensive qualities. Despite his advanced passed Pe3, Black can lose and should be satisfied with a draw. Candidates (50…): Rh1+
50…Rh1+ 51.Kg4
Here, I had failure of board vision and missed that Bc4 protects Rg8, and so went for 51…Bf3+ 52.Kxf3 [thinking 52.gxf3 Rg8+ skewers Rg8] 52…Rxh4. < <dzechiel> wrote: OK, I will have to read the notes to see what the software has to say about this position.> Toga confirms the game variation that you gave as best play. |
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| Dec-19-09 | | CHESSTTCAMPS: <Once>
Of the three "mad" positions, I like the middle one best. I'm sure there must be an encrypted message in the three together, so that should keep us busy the rest of the day. :>) <Patriot>
My thought process was similar to yours, except at first I thought the solution might be 50... Rh1+ 51.Kg4 Bf3+(??) before I noticed that the Rg8 is protected by the Bc4. |
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| Dec-19-09 | | turbo231: Some people, not most, complain about CG puzzles, I've complained myself. They state that the puzzle says " white or black to move and win", where do they get that "and win" from? All it states is "white to move" or "black to move". |
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| Dec-19-09 | | Eduardo Leon: <turbo231>, a part of the puzzle is to determine whether the player to move should play for a win or for a draw. |
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| Dec-19-09 | | turbo231: <Eduardo Leon> < a part of the puzzle is to determine whether the player to move should play for a win or for a draw> Yes,precisely. |
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Dec-19-09
 | | Jimfromprovidence: FWIW, here's an alternative ending that I thought might give white a shot at winning but which also ends in a draw. 53 Rc8 Bf6+ 54 Kh3 e2 55 Bxe2 (winning??) Be6+ (no way) 56 Bg4 
click for larger view |
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| Dec-19-09 | | Patriot: <CHESSTTCAMPS> Remember where I said I went down a dead-end road with 51...Bf3+? Well...I was also eyeing the g8-rook after 51...Bf3+ 52.gxf3 Rg1+ but saw the rook was protected by the bishop. But then I took that further! 53.Rxg8 Bxg8 and then looked for ways to get the pawn pushed down to the queening square but nothing panned out. I knew black was in a desperate situation so it was necessary to dig deep (after the only move 50...Rh1+) and look for crazy ways of getting that pawn down the board, and given the fact I missed the tactic (...Bd5) early on as in the game line. Then I re-visited 51...Rxh4+ again trying to see if I missed anything and that's when I saw 52.Kxh4 Bd5! I pretty much ruled everything else out at that point and settled on that move as the only hope for black. |
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| Dec-19-09 | | JG27Pyth: Great position... applause to all who found Bd5 -- was too clever for me! |
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| Dec-19-09 | | patzer2: For what it's worth, Fritz 10 gives 51...Bxg2 52. Rxg2 = or 52. Kxg2 = as an alternative to the game continuation. However, it's slightly lower on the program's evaluation (0.00 for 51...Rh1+ and 0.16 for 51...Bxg2 @ 20 depth), and appears to be a more complicated position than the game continuation. Certainly it's not a position (piece down for a non-passed pawn) that I would enjoy defending. |
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| Dec-19-09 | | Patriot: <patzer2> You're right! That looked losing to me so I tossed that candidate. Thanks for pointing this out. |
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| Dec-19-09 | | CHESSTTCAMPS: <Patriot> <Remember where I said I went down a dead-end road with 51...Bf3+? ...> I missed this when I skimmed your post. So at least the two of us and <johnlspouge> had this persistent hallucination. |
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| Dec-19-09 | | TheChessGuy: Revenge for my botching of yesterday's puzzle! |
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| Dec-19-09 | | WhiteRook48: I said 50...Bd5 right away |
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| Dec-19-09 | | RandomVisitor: After the suggested improvement 31.Qb7 white would have a strong game:
click for larger view Rybka 3:
<[+1.22] d=21 31...e4> 32.Qxa7 Bd4 33.Qa4 Bc5 34.Bc4 e3 35.fxe3 Qg4 36.Bb3 Qxa4 37.Bxa4 Nxh6 38.Bc7 Bxa2 39.Rb2 Bf7 40.Bxb6 Rb8 41.Reb1 Rxb6 42.Rxb6 Bxe3+ 43.Kh2 Bxb6 44.Rxb6 Nf5 45.Bd7 Ne7 46.Kg3 Kg7 [+1.37] d=21 31...Nxh6 32.Qxa7 Nf7 33.Qa6 Bd8 34.Bc4 h5 35.Bxe6 Qxe6 36.Rb4 Re8 37.a4 g5 38.Qb5 h4 39.Bh2 Re7 40.Rbb1 Kg7 41.Rbd1 Bc7 |
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| Dec-19-09 | | TheaN: 6/6
I can post all the analysis but this is a pretty much forced combination, but I was wondering that Black probably wouldn't win after 56.Rc8 Bxc4 57.Rxc4... guess I was right, because that, and the perpetuals posted, are as dead drawn as they can be. Considering that I did see White's threats, I would have saved myself half a point. Good going this week, albeit a bit incomplete and slow at times :). |
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| Dec-19-09 | | Formula7: White is threatening 51.Bg5+ Kh5 52.Bf7# which limits Black's options. 50...Rh1+ is the only reasonable check. After 51.Kg4 White is threatening mate in one by 52.Bg5#. OK, I think I have this one figured out. After 51.Kg4 Black just plays 51...Rxh4+! 52.Kxh4 Bd5! 53.Rc8 (53.Bxd5?? e2 queening) Bf6+ 54.Kg3 (54.Kh3/Kg4 e2 55.Re8 (55.Bxe2 Be6+ followed by 56...Bxc8) Bxc4 with material advantage) Be5+ 55.Kh4 Bf6+ with perpetual check. Time to check. |
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| Dec-19-09 | | TheaN: Just to clarify, I guess 53.Rc8 Bxc4?! 54.Rxc4  is pretty drawn too:
click for larger viewI guess White has practical chances due to the King placements; Black cannot effectively protect e3 without running into some kind of mating net: after 54....Bh2?! 55.Rc6† Black should really be starting to watch out, and 54....Bf6† 55.Kg4 Bg5 56.Rc6†..... ouch. However, Black should be able to achieve something like: 
click for larger viewwhere 1.Re6† Kh7 2.Kh5 Kg7 ends up being a draw. Too complex though, if Black is willing to invest some time in perpetual threats. |
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| Dec-19-09 | | Patriot: <TheaN> "...where 1.Re6† Kh7 2.Kh5 Kg7 ends up being a draw." In that line 3.Rg6+ followed by 4.Rxg5 wins. |
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| Dec-19-09 | | TheaN: <Patriot> Doh. Hm. Okay, based on opposition and the fact that Pg2 is still on his starting square White has very practical chances after 53.Rc8 Bxc4?, instead of the draw I claimed. I was looking at ways to give back the exchange by capturing the pawn, but in this case the Bishop is the easy target. Of course, 53....Bxg2= ends any of that easily, leaving White with AT MOST R vs B, which is quite easily drawn on its own (easier than R vs N). |
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| Dec-19-09 | | felixd: Very easy for a saturday.... Nice puzzle though. |
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| Dec-19-09 | | gofer: I saw this one, but it took a while. The main point being that this all looks pretty forced. White has so many threats that black has to take Bh4 as otherwise black will lose. Finding Bd5 was also pretty easy. The difficult point for me was admitting to myself that this was the solution! (i.e. I can see a draw, but is that all I am going for?) So no analysis today, cos I honestly thought I could be barking up the wrong tree! But given hindsight, white is so close to mate, it seems that black is pleased just squeeze a draw out of it... :-) |
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Dec-20-09
 | | Once: Ahem ... I think 53...Bxg2 (= 0.16) was spotted way back on page 1 of the kibbitzing. Modesty prevents me from naming the handsome, suave, debonair, erudite kibbitzer who first suggested it (with silicon help, natch!) 8-) |
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