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| Jul-05-07 | | 2ndNature: Much easier than yesterdays. Got it with no probs. |
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| Jul-05-07 | | Tactic101: Not hard this time around. |
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| Jul-05-07 | | 4i4mitko: well i didnt look at Ng4 defence but
1.Rxg7 Kxg7
2.Rg1+ Kh8
3.Qg3 Rg8
4.Qxg8 Nxg8
5.Nf7x |
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| Jul-05-07 | | Gilmoy: Even material. Black has a bad B, an odd Rb8 (maybe OK, because of its pressure on White's K), and bad Q (apparently chased off of b7 by White's Nd6). White's Rg1 has slightly greater pressure on Black's K (because of check). White has a temporary K-side 3-on-1. [A] 27.Qg3 g6 28.Qh4 Kg7 29.Qe7+ Nf7 blah.
[B] 27.Rxg7+ Kxg7 (Kh8 28.Qg3) 28.Qg3+ Kh8 29.Rg1 looks like another Arab mate: Rg8 30.Qxg8+ Nxg8 31.Nf7#. [B2] 28..Ng4 29.hxg4 Rg8 30.gxf5+ Kf8 31.Qh3 still wins for White. |
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| Jul-05-07 | | Wilson H. L.: Interesting : the one problem with this puzzle is that black hardly has a good move, so finding an acceptable continuation was rather difficult. Solved it anyway. |
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| Jul-05-07 | | awfulhangover: 4/4 this week! |
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| Jul-05-07 | | znprdx: Well since it’s a problem of the day 27.Rxg7+ and then what...unclear... 27. Qg3 is at least forcing g6..aha if the queen could get to h4 ...quietly Qf2
Speaking of silence I love Ne2>g3>h5
Doesn’t just about anything or everything win? Doubling the rooks
Rg5 (or even..Rg6?!) has the most appeal – A] if ...Nf7 28. Rxg7+ KxR
29.Qg3+ Kh8 30.Rg1
- B] if.g6 28.R(d)g1 and then bring in the queen –but it is getting fuzzy Well, patzers always see everything but:
The idea is for the Q to get f6 with black’s knight at f7 or en prise at h6 So back to KISS 27. Rxg7+ if ..Kxg7
28. Qg3+ Kh8 29.Qh4! this is my story and I’m sticking to it....the follow-up of Rg1 should win easily..there is even a smothered mate theme lurking...... |
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| Jul-05-07 | | goodevans: Got it quite quickly. A bit of a let down for a Thursday, I thought. Given how most of black's pieces are cut off from the K-side, the only difficulty in this puzzle seemed to be in being sure there wasn't an even better way to win! |
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| Jul-05-07 | | fyad reject: spent a lot of time looking at 27. Qg3 g5/g6 and completely overlooked the right move :( |
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| Jul-05-07 | | ex0duz: <It's all fine for white if black plays 28. Kh8. think about this line 27.Rxg7 Kxg7 28.Qg3 Ng4 29.hxg4 Rf7
Now what?
30.gxf5 Rg7 black captures the g file and then comes the rook and Q. 30.Nxf7 Kxf7 31.gxf5 again opens up the King but no immediate mate yet. m i missing something?> After 30.gxf5+(you forgot that it was a check :p), the black king must go f8 or h8, which is the same as the game. After blacks king move, Rg1 wins. In the second line you gave, after 31. gxf5, if black moves his king(try to run from Rg1), bishop(to clear backrank to defend mate with Q/R), or moves D pawn(make space to run king etc), Rg1 still wins by force, and even if it didnt, then white is still up a full minor piece(knight) and two pawns, and has such a dominating position/attack which should be more than enough for black to resign. |
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| Jul-05-07 | | realbrob: Jakov Geller didn't give Grischuk much satisfaction indeed... A possible line could be 27.Rxg7+ Kxg7 28.Qg3+ Kh8 29.Rg1 if Black tries 29..Rg8 you have the nice conclusion 30.Nf7+ Nxf7 (forced) 31.Qxg8#. Anyway, Black has two other main options: 28..Ng4 29.hxg4 Kh8 Black has the exchange for a pawn but I think White wins with 30.Rg1 and Black can't play 30..Rg8 because of the smothered mate 31.Nf7#. Black could also avoid to take the rook with the king but that could result in the previous line after 27..Kh8 28.Rdg1 Ng4 and so on. |
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| Jul-05-07 | | Caissanist: This puzzle reminded me of Spielmann's comment that he could find winning tactical shots just as well as Alekhine could, but wasn't as good at reaching positions that had them. Black's position is so cramped and passive that it practically screams "sacrifice leading to mate", and n doubt there are a number of other wins besides Rxg7. I was much more impressed by Grischuk's play leading up to the sac than the sac itself. While trying to figure out just where black went wrong, I became suspicious of black's opening. I hadn't seen this line before and it doesn't seem right, leaving the d-pawn backward and the king in the center. Sure enough, opening explorer shows that, after 8.O-O-O, white won 47% of the games in the database, and black only 17%. I don't see any obvious mistakes for black after the eighth move--perhaps he is already lost by then. |
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| Jul-05-07 | | zb2cr: The initial move 27. Rxg7+, and the "main line" analyzed by <dzchiel> are rather obvious. Actually, the complications after 27. ... Kxg7; 28. Qg3+, Ng4; 29. hxg4 are more apparent than real. If 29. ... Kh8; 30. gxf5 and Black is helpless. He can't play 30. ... Rg8 because of 31. Nf7#. And White is threatening Rg1 to support Qg7#. If 29. ... Rg8; 30. gxf5+, Kf8; 31. Qh4! White's threatening 32. Qf6#. Black can't play 31. ... Rg7 because of 32. Qd8#. 31. ... Rg6 simply costs him the Rook after 32. fxg6, which renews the mate threat. I don't see any way for Black to be able to slip out then; but even if he does he's down a piece and his position is very passive. Took me about 2 minutes to work out the main line. |
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| Jul-05-07 | | YouRang: Got it pretty quick. I noticed that white's knight and e5 pawn make a neat barrier along the f-file, forcing the king into a corner after 27. Rxg7+ Kxg7 28. Qg3+. Also, black's pieces are poorly arranged to help defensively, so white has time to make a Q+R battery with 29. Rg1, with unstoppable mate threats. Black might be able to stop immediate mate by throwing material away: block with knight, move queen to a7 and trade it for the rook. But if that' the best you can do, you might as well resign. |
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| Jul-05-07 | | gnixon: I think the real question is whether this should have been a Wednesday or a Tuesday. I saw Nxc8 first, which should also be winning. I checked that black has no counter-threats, then Rxg7 hit me in the face like a big stinky fish. As dzechiel alluded, the general aspects of the position are so dominating that something simple should win. |
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| Jul-05-07 | | kevin86: Looks harder than it is. While black can gum up the works with an interposition at g4 to force white to black the g-file.. White's interfering pawn is soon moved to f5,as black cannot move his own pawn to avoid the "reopening sale" Avoiding the possible pseudo snag at g4,it looks like a Monday puzzle-Tuesday at latest. |
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Jul-05-07
 | | al wazir: I saw 27. Rxg7+ Kxg7 28. Qg3+ (who didn't?), but I also saw the continuation 28...Ng4 29. hxg4 Rg8 30. gxf5+ Kf8. So my solution is 27. Rxg7+ Kxg7 28. Rg1+ Kh8 29. Qg3 Ng4 30. hxg4 Rg8 31. Nf7+ Kg7 32. gxf5+ Kxf7 33. Qxg8+ Ke2 34. Rg7#. There are variations and permutations of this line, but they all use the same ideas. For example, 27. Rxg7+ Kxg7 28. Rg1+ Ng4 29. hxg4 Rg8 30. gxf5+ Kf8 (30...Kh8 31. Nf7#) 31. Rxg8+ Kxg8 33. Qg3+ Kf8 34. Qh4 Bb7 35. Qxh7 any 36. Qf7#. |
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| Jul-05-07 | | Caissanist: <I don't see any obvious mistakes for black after the eighth move--perhaps he is already lost by then.> It turns out that Crafty disagrees with me. The engine says that 14...O-O (instead of 14...f5?) leaves white with only a small edge. While that's certainly not a position that I would want to play as black, it does seem to be survivable. |
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| Jul-05-07 | | PAWNTOEFOUR: well i got the first four moves,then i let shredder show me the rest..but as far as the puzzle goes,there's nothing else to do but go Rxg7+ |
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| Jul-05-07 | | Crowaholic: Much easier than yesterday's, which I missed. I actually thought it was too easy for a Thursday and analyzed many lines including declining the sac offer where I basically found 27. Rxg7+ Kh8 28. Qg3
to be winning for mostly the same reasons that the accepted sac wins. Then I looked at the solution and saw that Geller resigned immediately after Rxg7+... oh, well. I learned something anyway. <dzechiel: 30 Qxg8+! Nxg8 31 Nf7#> Hmm, nice Q sac, although the knight sac suffices to deflect the Black knight: 30. Nf7+ Nxf7 31. Qxg8#. I know, a mate is a mate, but I'm a hopeless perfectionist... :o) More importantly, Black has a better defense than 29. ..Rg8 to which ..Ng4 (which you mentioned) is the key, e.g. 29. ..Ng4 30. hxg4 Qa7! 31. gxf5 Qxg1+ 32. Qxg1 exf5 33. Qd4! Now White is "only" a minor piece and a pawn up, and the old mate threats no longer work. On the other hand, White is threatening to promote as well as bring in his other knight and finish Black off and this won't take too long. But these moves do manage to delay the mate for a while. |
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| Jul-05-07 | | SpecialK: 27. Rxg7+ yields mate in a few moves, nothing more to say. |
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| Jul-05-07 | | MostlyAverageJoe: <Crowaholic: 29. ..Ng4 30. hxg4 Qa7! 31. gxf5 Qxg1+ 32. Qxg1 exf5 33. Qd4!> No, Qd4 is too passive.
Hiarcs recommends 33 Nd5! and mate in 9. Here's the entire line (starting from the puzzle position, to make sure I did not misunderstand the moves leading to your line above): 27. Rxg7+ Kxg7 28. Qg3+ Kh8 29. Rg1 Ng4 30. hxg4 Qa7 31. gxf5 Qxg1+ 32. Qxg1 exf5 33. Nd5 Bb7 34. Nf6 Bd5 35. Qg5 Bf7 36. Nxh7 Bg6 37. Qxg6 Rbe8 38. Nf6 Rxf6 39. Qxf6+ Kh7 40. Nxe8 a5 41. Qg7# |
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| Jul-05-07 | | patzer2: For today's puzzle solution, it's the demolition sacrifice 27. Rxg7+!! to the rescue. |
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| Jul-05-07 | | Crowaholic: <MostlyAverageJoe: No, Qd4 is too passive.> You are right, Nd5 wins more quickly than Qd4. |
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Jul-05-07
 | | fm avari viraf: White is having a dream position & all his superior forces are ready to crush. After having a glance, 27.Rxg7+ finishes off Black's feeble defence as 27...Kxg7 28.Qg3+ Kh8 [ even 28...Ng4 won't work ] 29.Rg1 & again Black is hapless. |
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