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| May-15-07 | | chk12: First on this one.. :-)
32. ... Qxf6, or 32. ... RxRe1+ & 33. ... Qxf6 does not work due to the bank rank mate. |
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| May-15-07 | | dzechiel: Boy, here it is Tuesday, and I find myself looking at all sorts of stuff. I have to believe that I'm overlooking something obvious, but until I see it, here's what I have: Candidate moves are:
- 31 Rxe8
- 31 Bxg7
- 31 f6
- 31 Bb6
- 31 Ne4
It seems like you want to move your e-rook, as allowing black to play ...Nxe1 doesn't seem to be that good. What about 31 Rxe8 Qxe8 32 Bxg7 Bxg7 33 f6 Qf8. Or, maybe the rook capture isn't necessary! How about 31 Bxg7 Rxe1+ 32 Rxe1 Bxg7 (or else 33 Bf6+) 33 f6 Qf8 34 Re8 and mate next move, does that work? I think this is the line we are looking for, a little beyond most Tuesday positions, but still pretty forced. Let's check the move made.
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May-15-07
 | | cu8sfan: Very difficult for a Tuesday. It's been a while since I was stumped this early in the week. |
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| May-15-07 | | Fourpointo: 32. ...Rxe1+ 34. Rxe1 Qf8 34. Re8 Kh8 35. Rxf8 Bxf8 buys some time I think with only a queen for a rook trade, but it's still bad position. |
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| May-15-07 | | Skylark: I spent a while looking at 31. Bf6 when I realised that back rank was the theme and that the focal point on g7 was a decoy. After I realised that, it didn't take long to see that Bxg7 was a forced win. I have to agree though, this week it seems <CG> has toned up the puzzles this week! Can't wait till Sunday ;) |
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| May-15-07 | | dzechiel: <Fourpointo: 32. ...Rxe1+ 34. Rxe1 Qf8 34. Re8 Kh8 35. Rxf8 Bxf8 buys some time I think with only a queen for a rook trade, but it's still bad position.> Can't white improve with 35 Qxg7#? |
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| May-15-07 | | ahmadov: A nice one! |
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| May-15-07 | | Tactic101: Another hard puzzle. Chessgames has us on our toes early in the week. |
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| May-15-07 | | chessmoron: What a slaughter! I saw 31.Bxg7+ Bxg7 32.f6 and Black couldn't survive this. |
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| May-15-07 | | openingspecialist: Just a point of information why didn't the puzzle start a move earlier? it seems that Rook move is forced or else loss of peice and eventual mate but Rxe1 seemed possible but Rxe1 Nxe1 dxc7 Qxc7 Qxe1 and up a peice. Am I missing something here? |
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| May-15-07 | | MostlyAverageJoe: No way this is a Tuesday-level puzzle. By now, my experiment with computer-aided evaluation of puzzle difficulties seems to have gathered sufficient data to qualify this one on Thu-Fri level (see my forum for details). For starters, the line played in the game includes a big blunder by the black player: 31 ... Bxg7? results in a forced mate in 7 (including desperate sacs to delay the mate): 32. f6 Rxe1+ 33. Rxe1 Qb6+ 34. Kh1 Nf2+ 35. Kg2 Ng4 36. Qxg4 Qg1+ 37. Kxg1 Rd8 38. Qxg7# The best resistance by black produces something like this: 31. Bxg7 f6 32. Bxf6 Rg7 33. Bxg7 Bxg7 34. f6 Qb6 35. Kg2 Qf2 36. Qxf ... Sad to say, I saw the beginning of the defensive line above, and did not analyze it deep enough, settling on 31.Rxe8 (with the same continuation as shown by <dzechiel>), which is a fairly acceptable second-best solution. It does provide a win for the white, although much slower than 31.Bxg7. After 20-ply analysis, it evaluates to +4.5 or so (this is more up-to-date evaluation than the +3.74 from my forum's post). Further computer-aided analysis shows these interesting postions: After dzechiel's 31. Rxe8 Qxe8 32. Bxg7 Bxg7 33. f6 Qf8, followed by 34. Bxd7 Bxd7, we have clear advantage for white (expect 35. Rd2, with the g7 bishop to die soon thereafter): 
click for larger viewAfter a variation of the above also clear (black must take the bishop with the rook, else f6 will cause big trouble): 31. Rxe8 Qxe8 32. Bxg7 <f6> 33. Bxf6+ Bg7 34. Be7: 
click for larger viewAside from the indicated variation, both lines are pretty much strongest for each side (the 33 ... Kf7, which might appear attracive in the second line, realy is not, but I won't further clutter the forum with details). |
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| May-15-07 | | vibes43: Took me a while and had to revisit Bxg7 several times before settling on that move. And I thought doubled pawns was a bad thing. Good Puzzle. |
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| May-15-07 | | MostlyAverageJoe: <openingspecialist: Just a point of information why didn't the puzzle start a move earlier?> 30 ... Rd7 was a blunder. Black could play: 30. ... Rxe1+ 31. Rxe1 Nxe1 32. dxc7 Qh4 and at this point, the positions evaluates to +2.82 (15-ply). White will win but slowly. In any case, 30.exd6 is kinda obvious, and the line above, with the interesting fork if 33.Qxh4 is way beyond the Tue puzzle difficulty. |
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| May-15-07 | | slowrobot: I found Bxg7 and then I loaded it up on the computer (xboard and crafty) to play it out for fun. 31. Bxg7 Rxe1+ 32. Rxe1 f6 33. Bxf6+ Rg7 34. Bxg7 Bxg7 f6 And then, something I've never seen before and never expected to ever see: the computer <resigned>. I didn't even know they did that. |
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| May-15-07 | | Confuse: thats cool. |
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| May-15-07 | | prinsallan: Found this easily. The Rook, threatening a back-rank mate cannot be stopped without black losing his queen. Of course the sequence starts by luring away and pinning the bishop to the king. |
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| May-15-07 | | vagrantlike: A complex one needs hard analysis:My conjecture moves are as follows(differed from what had been played by the last move):31.Bxg7 Bxg7 32.f6 Qxf6(still cannot get black off the hook because of white's next move) 33.Rxd7#(Timoschenko's 32...Qb6 only procrastinates the back rank mate)
BTW,I like some dynamical endgame puzzles cg used to offered with less pieces on the board which needs large amount of anaysis and can lear a lot.(My answers often difer from the correct ones.) |
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| May-15-07 | | Marco65: <MostlyAverageJoe> <with the interesting fork if 33.Qxh4> I can't see any of your posted line with that... |
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| May-15-07 | | tal lover: Can I play 32.Rxe8+ before f6? because was this line that i see, if i cant please correct me |
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| May-15-07 | | PositionalTactician: Hmm, an interesting puzzle involving the use of a weak back rank. |
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| May-15-07 | | mkrk17: I see Bxg7 Bxg7, f6 Qxf6, Rxe8 #
Can someone tell me whats wrong with this.. ? |
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| May-15-07 | | vagrantlike: Dunno how to revise my error in my last typing.:p ==>It's 33.Rxe8#(not 33.Rxd7#) mkrk :I chose the same line as you and I think the only use of the move 31.Qb6 is to procrastinate the mate threat.The order of moves is important.Not to take the e8 rook before playin'f6 cause this may leads to difficult trouble (e.g.I cannot see imediate mate.) |
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| May-15-07 | | goodevans: <tal lover: Can I play 32.Rxe8+ before f6?> After 31 Bxg7 Bxg7; 32 Rxe8+ Qxe8; 33 f6, black can stave off the immediate loss with 33 ... Qf8. This was a better puzzle than usual for a Tuesday because once you've spotted the key moves Bxg7, f6 and Rxe8+ you need to decide the right order to play them. Although I got that bit right, I must admit that I didn't even consider that black might thwart the attack with 32 ... Qb6+. Luckily that didn't lead to anything. |
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| May-15-07 | | Richerby: <slowrobot: the computer resigned. I didn't even know they did that.> Computers are typically set to resign once they're down more than, say, four pawns' worth of material. Of course, this is adjustabe in any decent program. |
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| May-15-07 | | erasmusdurer: Seems like Monday all over again. NO PROBLEMO. |
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sac: 31.Bxg7