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| Jun-23-10 | | patzer2: For today's "easy" Wednesday puzzle solution, 52. g6! neatly combines the pin, double attack, discovered attack, decoy and passed pawn tactics to uncover a decisive result in this very entertaining and instructive endgame position. |
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| Jun-23-10 | | cydmd: <Once>, brilliant chess chronicle !! It deserves to be published in a chess magazine. |
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| Jun-23-10 | | mastyin: 1. g6 2. Kxg6 2. Rc6+ |
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| Jun-23-10 | | timothee3331: A nice little move ! |
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| Jun-23-10 | | YouRang: Very nice puzzle. I got it pretty quickly going on the correct assumption that white wants to deflect the black rook from its role as promotion stopper. Looking around the board for a volunteer to assist in this deflection scheme was easy -- there's only one with even a remote chance: the pawn on g5. To make it easier, that pawn has just one move: <52.g6!>. This amazing unguarded pawn gives black fits:
- It can't be taken by the pinned e-pawn (illegal).
- It can't be taken by the king since 52...Kxg6 is met be 53.Rc6+, giving us our deflection and a winning Q vs R ending after 53...Rxc6 54.b8=Q. - It can't be ignored since it threatens 53.gxe7, creating another promotion threat. If the king tries to block it with 53...Ke8, then 54.Rc8+ Kxe7 55.b8=Q Rxb8 56.Rxb8 wins. Of course, black has the same sort of problem if he captures the e-pawn after it promotes. |
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| Jun-23-10 | | Marmot PFL: 52 g6 in about 5 seconds, my fastest of the week. 52...Kxg6 53 Rb6+ wins. |
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Jun-23-10
 | | kevin86: The key was that after 52 g6,the pawn is taboo. If the king takes-Rc6+ diverts the rook,and if the rook takes,the pawn queens straight off. The sequel is that the threatened queening at f8 forces the king to the eighth row where a rook check will force home the pawn. |
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| Jun-23-10 | | BOSTER: The function of the black rook on b6 is to hold b7 pawn from promotion.
It means that black rook has already the duty.
White can use g pawn to lure the black king to the 6 rank. After 52.g6 Kxg6(forced) 53. Rc6 (deflection) Rxc6 54.b8=Q and white wins. If 52.g6 Rxb2 53.gxf7 and white can promote the b pawn.
Maybe this is happy coincidence that black rook was on the b6, if black rook was on b5,b4 or b3 it would be draw. |
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| Jun-23-10 | | WhiteRook48: 52 g6 eh. too easy |
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| Jun-23-10 | | zooter: I think this is pretty easy
After 52.g6 black cannot take the pawn by Kxg6 as 53.Rc6+ and the ending is a queen vs rook Other tries also come up bad
a) 52...Rxg6 53.b8=Q is obviously bad
b) 52...Rxb2 53.gxf7 and black runs out of checks
c) 52...f4 53.gxf7 f3 54.f8=Q+ Kxf8 55.Rc8+ is an old trick everybody knows That's it. I think I've covered pretty much everything. Time to check |
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| Jun-23-10 | | BOSTER: <J.Caesar> <Saw this one in a flash,... because L.van Wely employed precisely the same mechanism vs A.Girl,2010>.
I don't want to disappoint you ,but the ideas,and mechanisms are absolutely different. |
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Jun-23-10
 | | LIFE Master AJ: 52.g6! Its a pretty simple idea.
White threatens g6xf7, and with another Pawn on the 7th rank, Black will be unable to deal with the threats. Black's f-Pawn is pinned to his King, so PxP is impossible. One of the main tactical aspects of this move can be seen after 52...KxP/g6; 53.Rc6!+, when Black's Rook is forcefully DEFLECTED from the promotion square (b8) and now the White (Prince Charles) Pawn (on b7) takes that last fateful and decisive step. |
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| Jun-23-10 | | JuliusCaesar: You think the winning ideas are 'absolutely different' in this one, do you, BOSTER compared to Giri vs. van Wely? No similarity at all? In that case, I hate to disappoint you, but you need to get your head out of your backside. |
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| Jun-23-10 | | 4tmac: pretty |
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| Jun-23-10 | | turbo231: missed yesterdays got todays. got it |
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| Jun-23-10 | | David2009: An extraordinary blunder (49...Rfb5??) by Black in a drawn position: 
click for larger view...Re5+ is perpetual check: White has nothing better than repeating moves
by 50 Kf1 Rf5+ 51 Ke1 since if 51 Kg1?? Rfb5! 52 Rf2? Rxg4 is CHECK. The puzzle could have started two move earlier: White has a forced win at move 50. |
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| Jun-23-10 | | turbo231: Even though i missed yesterday's puzzle it was cute. I wonder how long it would've taken me to see qb4? A week, month, year, 10 years, thousand years, maybe a million........ |
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| Jun-23-10 | | tarek1: <David2009>
I agree that Rfb5 speeds up defeat but :
what Black can do if white brings his king up the board, pushing the b pawn ?For example :
<49...Re5+ 50.Kd1 Kd5+ 51.Kc1 Rf5 52.Rg4 Rb3 53.Kc2 Rb6 54.b4 Rbb5 55.Kc2 Rb6 56.Kc3 Rbb5 57.Kb3 Rb6> etc. until reaching this position : 
click for larger viewNow it seems to me that white is winning, for example play Rc4-Rc5, force an exchange of rooks taking back with the b pawn...
I may have missed something but this is the only plausible winning plan for White and I don't see a defense at the moment. Very interesting endgame anyway :) |
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| Jun-23-10 | | Brandon plays: I actually had just a slight revelation when considering this position. It all of a sudden struck me that pushing the black pawn to g6 appears to win. The pawn is pinned and the only other move is king takes after which one can play Rc6 winning the rook or promoting the queen. This seems like a win especially since white has a passed pawn. I don't really see anything else too promising. |
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| Jun-23-10 | | shatranj7: Nice petite combo. After 52.g6!, If 52...Kxg6, then 53.Rc6+! Rxc6. 54.b8, etc. This was considerably easy, though. |
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| Jun-24-10 | | eaglewing: <tarek1: 49...Re5+ 50.Kd1 Kd5+ 51.Kc1 Rf5 52.Rg4 Rb3> At this point you suggest a kind of waiting move for Black. I think Black needs to act:
52.Rg4 Rf1+ and now?
Kd2 Rxb2+ or Kc2 Rf2+ Kc/d3 Rbxb2 and without the Pb2 to hide the rooks might construct a perpetual. |
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| Jun-24-10 | | tarek1: <eaglewing> Good point. But it's not obvious to me that taking the b2 pawn solves Black's problems.
After <54.Kc3 Rbxb2> there is this bizarre move : <55.Rb4>, and if <55...Rfc2+ 56.Kd3 Rxb4 57.Kxc2> and the plan is to c6 with the king, Black is paralysed. But also there is <55.Kd4> and how can Black force a perpetual if the white rook on g4 can cover checks, like this :
<55...Rfd2+ 56.Kc5 Rdc2+ 57.Rc4> ? (mind you, <55...Rb4+> doesn't win the the g4 rook because the b-file rook has to always guard b8...) So <55...Rf5> is better, cutting the white king but <56.Re4 Rxg5 57.Re5> 
click for larger viewis there a perpetual in this position ? I don't see one. But again, it's very hard to completely solve this position, perhaps an engine could give the answer. |
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| Jun-24-10 | | eaglewing: <tarek1> Getting the Pb2 might be a step ahead towards a draw, one less option for a queen anymore. Regarding 55. Rb4:
55. Rb4 Rfc2+ Kd3 Rd2+ and now?
Ke3-h3 Re2-h2+
Ke4 or Ke3+d4: Rxb4
So it is: Kc4 Rdc2+
Kd3 already covered
Kd4/b5/d5 Rxb4
No, 55. Rb4 is not a problem.
Enough for now, maybe your Kd4 is an idea, at least Black needs to be precise. |
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| Jun-24-10 | | eaglewing: <tarek1> <55.Kd4 Rf5 56.Re4 Rxg5 (or maybe Rfb5?) 57.Re5 (Re7?)> Rg4+ and now? Not 58. Re4 Rb4+.
Following 58. Kcde3 or Kcd5 I think Rgb4 is fine. Now with doubled rooks on the b-file a king on c6 is driven off with Rb6+ and if the white rooks double on the 7th row (c7+e7) the white king cannot hide on the rows 1-6. If he goes to d7 or a rook protects him, then Rbxb7 can follow. |
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| Jun-25-10 | | David2009: <tarek1> thanks for your comments on A Budnikov vs Varavin, 1989. I have set the position at move 49 up on Crafty and I find that White struggles to escape the perpetual check. After 52 Rg4 Black continues 52...Rf1+. Crafty link:
http://www.chessvideos.tv/endgame-t... You may be able to find the win that I have missed. At the moment I agree with <eaglewing> that the position is drawn. White has to be careful not to over-press. For example, in the diagram you give
click for larger view Black (to play) has 1...Rb4+ 2 Kc5 (or c3) Rxb7! turning the tables. |
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