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| Feb-05-16 | | devere: I saw 25.Rxe6 fxe6 26.Rd5 exd5 27.Bxg7+ Kxg7 28.Qg6+ Kh8 29.Bg8
click for larger viewand I was happy, but then comes the sequel
29...Ra1+ 30.Kg2 Qxf2+ 31.Kxf2 Rf8+ 32.Ke2 Ra2+ 33.Ke3 Bg5+ 34.Qxg5 Re8+ 35.Kd3
click for larger view
and on 35...R(either)e2 36.Bf7 White wins.
I didn't look at Jobava's move 26.Rg4, which seems better than the more spectacular 26.Rd5 . |
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Feb-05-16
 | | al wazir: OK, now I see. 27. Qg6 Bf8 28. Qh5.
A) 28...Be7 29. Bg6+ Kg8 30. Qh7+ Kf8 31. Qh8#.
B) 28...Re6 (with the idea of playing 29...Rh6 next move to block the discovered check) 29. Bg6+ Kg8 30. Qh7# C) 28...e4 29. Bf5+ Kg8 30. Qh7+ Kf7 31. Rxg7+ Bxg7 32. Qxg7#. This is a *much* harder puzzle than it seems to be. |
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| Feb-05-16 | | agb2002: The material is identical.
The bishop on e6 prevents Rg4, attacking g7 twice. This suggests 25.Rxe6 fxe6 26.Rg4: A) 26... Bf6 27.Bxf6 gxf6 28.Qg6
A.1) 28... Re7 29.Qxf6+ Kxh7 30.Qh4+ Qh5 31.Qxh5#.
A.2) 28... Qg5 29.Rxg5 fxg5 30.Qh6 Re7 31.Bf5+ Kg8 32.Bxe6+ Rxe6 33.Qxe6+, etc. B) 26... e5 27.Qg6
B.1) 27... Bf8 28.Qh5 g6 (due to 29.Bg6+ Kg8 30.Qh7#) 29.Bxg6+ Kg7 30.Qh7+ Kf6 31.Qf7#. B.2) 27... Bf6 28.Qh5
B.2.a) 28... Reb(c,d)8 29.Bf5+ Kg8 30.Be6+ Kf8 31.Qf7#. B.2.b) 28... Qa3 29.Bg6+ Kg8 30.Bxe8 Qc1+ 31.Kg2 Qxc3 32.Qf7+ Kh7 (32... Kh8 33.Qc8+ Kh7 34.Bg6+ Kh6 35.Qxa8 wins) 33.Qg6+ Kh8 (33... Kg8 34.Qxf6 wins) 34.Bf7 Qc1 35.Rf4 and mate in two (35... exf4 36.Qh5#). C) 26... Rg8 27.Qg6
C.1) 27... Bf6 28.Qh5
C.1.a) 28... Rge8 29.Bg6+ Kg8 30.Bxe8 wins a piece at least. C.1.b) 28... Rgb(c,d)8 29.Bf5+ Kg8 30.Be6+ Kf8 31.Qf7#. C.1.c) 28... Rgf8 29.Bg6+ Kg8 30.Qh7#.
C.1.d) 28... g6 29.Bxg6+ Kg7 30.Qh7+ Kf8 31.Qf7#.
C.2) 27... Bf8 28.Qh5 as B.1. |
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| Feb-05-16 | | devere: <LoveThatJoker: I'm surprised GM Jobava did not find 27. Rxg7!!
I can't see a way out for Black after this stunning shot.> Try 27...Ra2! White can still win, but what Jobava played is better. Chess is a hard game! |
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| Feb-05-16 | | hedgeh0g: I went with 28.Qh5, but 28.Bg6 is not only more aesthetic, but also much stronger. |
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| Feb-05-16 | | gofer: The start is simple...
<25 Rxe6 ...>
White threatens to win a piece. The only check black has loses another, so
there is nothing for black to do but except...
<25 ... fxe6>
<26 Rg4 ...>
White threatens Bxg7#
26 ... Rg8
27 Bxg8 Kxg8/Rxg8
28 Qg6 mating
26 ... Bf6
27 Bxf6 gxf6
28 Qg6 Re7 (Rg8 29 Bxg8 mating)
29 Qxf6+ Kxh7
30 Rh4+! Qh5
31 Rxh5+ Kg8
32 Rh8#
<26 ... e5>
<27 Rxg7!!! ...>
White threatens Bg8 with two pieces protecting Qh7+ and so the rook has to be
taken due to 27 .. Bf6 28 Bg8 Kxg7 29 Qh7+ Kf8 30 Rf7# <27 ... Kxg7>
<28 Qg6+ Kh8>
<29 Bg8!!! ...>
The whole point of the rook sacrifice. Our queen can mate on her own if black play Rxg8 and if black doesn't play Rxg8 then Qh7# is inevitable... 
click for larger view<29 ... Qxf2+>
<30 Kxf2 Rf8+>
<31 Kg1 mating>
~~~
Nice easy Friday POTD... |
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| Feb-05-16 | | whiteshark: I somehow stpped calculating aftr <25. Rxe6! fxe6 26. Rg4> |
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| Feb-05-16 | | gofer: < devere: <27 Rxg7??? Ra2!!!> > Doh!!! |
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| Feb-05-16 | | diagonalley: <whiteshark> ditto! ... (looked good enough to play)... though i doubt i would have spotted the fabulous 28.B-N8! |
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| Feb-05-16 | | patzer2: Having a good week so far. I'm 5 for 5 as my alternative Friday solution 25. Rxe6! fxe6 26. Rd5! exd5 27. Bxg7+! Kxg7 28. Qg6+ Kh8 29. Bg8!  also wins, as play might continue 29...Qxf2+ 30. Kxf2 Ra2+ 31. Kf3 Rf8+ 32. Ke3 Bg5+ 33. Qxg5 Rff2 34. cxd5 Rfe2+ 35. Kf3 Rf2+ 36. Kg4 Rae2 37. h4. (+16.55 @ 23 depth, Deep Fritz 15).Black's first significant error appears to have been 18...Ncxe4?  to (better is 18...h6  ), as it gave White the opportunity for a strong, precisely calculated attack after 19. Nxe4 Nxe4 20. Bxe4 Qxd4 21. Bxh7+ Kh8 22. Bc3 Qc5 23. Rd4! to (+1.52 @ 23 depth, Deep Fritz 15). According to the computers, Black's decisive error was 23...Be7?, allowing 24. Re1! (+3.78 @ 22 depth). Instead, the computer indicates Black could have held on to slim drawing chances with the exchange sacrifice 23...Ra2!? 24. Qxa2 Kxh7 25. Rh4+ (+1.51 @ 24 depth, Deep Fritz 15). However, from a human perspective, it's hard to believe the exchange sac 23...Ra2!? offered Black any real hope in this game against the strong GM playing the White pieces. In addition to replacing 18...Ncxe4? with 18...h6 (+0.52 @ 22 depth, Deep Fritz 15), I think Black might improve early in the opening. Instead of 5...Be7 =, which is a perfectly fine move,
I slightly prefer the old but infrequently played 5...exd4 = as in Lilienthal vs Nezhmetdinov, 1951 or Euwe vs Reti, 1923. Deep Fritz 15 also slightly prefers 5...exd4 = (+0.17 @ 25 depth) over the more popular moves 5....c6 = to (+0.29 @ 25 depth), 5...g6 = to (+0.36 @ 22 depth) and 5...Be7 = to (+0.34 @ 25 depth). |
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| Feb-05-16 | | patzer2: <Devere...I didn't look at Jobava's move 26.Rg4, which seems better than the more spectacular 26. Rd5.> Same here. I was just happy to find a winning continuation after the obstruction 26. Rd5! However, I made it a point to look at the winning lines after Jobova's 26. Rg4 with the computer. I find going through alternative winning lines is often helpful, as similar positions from detailed side variations might arise in my own games or in analysis of other games. P.S.: Both 26. Rd5! and 26. Rg4! are clearly decisive, even though at lower levels of search depth the computers give 26. Rg4 the edge. I first looked at 26. Rd5!, calculated it to a clear win and didn't bother to look at other alternatives. |
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| Feb-05-16 | | bobbyperez: A combinationnnnn! :).I mean,I am happy |
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| Feb-05-16 | | Yurodivy: What is wrong with 28. Rh4 Bxh4 29. Bxg7 Kxg7 30.Rxe6 fxd6 31. Qg6#? |
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| Feb-05-16 | | psmith: <Yurodivy> 30... Rxe6 is what is wrong with that. |
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Feb-05-16
 | | Jimfromprovidence: I do not believe anyone mentioned this, but in the text line 25 Rxe6 fxe6 26 Rg4 e5 27 Qg6, 27...Bf8 instead of 27...Bf6 makes no difference as 28 Qf7 forces mate.
click for larger view |
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| Feb-05-16 | | ibnyamin: <Yurodivy> Not only does 30...Rxe6 ruin the attack, but even after 30...fxe6, 31. Qe6 is not mate. Black has the following continuation: 31.... Kh8 32. Bg8 Qf5 after which the only way to avoid the queen trade is
33. Qh6+ Kxg8. |
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| Feb-05-16 | | kevin86: sorry, this one is above my pay grade. |
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| Feb-05-16 | | BOSTER: <mdz: pogo posted it already>.
I saw this line till 28.Qg6+, but didn't see Bg8.
The problem in this combo is that after 25.Rxe6 black is not obliged to play fxe6.
He'd play 25. ..Qh5 to improve the pos of the queen. |
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| Feb-05-16 | | CHESSTTCAMPS: Material is identical. White has commenced a king-side incursion at a point when none of black's pieces actually defend the king-side. White needs only to break down the pawn barrier to leave the king defenseless. 25.Rxe6!
This creates a nice entry point for the queen on g6, leaving black defenseless: A.25...fxe6 26.Rd5! cxd5 27.Bxg7+! Kxg7 28.Qg6+ Kh8 (Kf8 29.Qg8#) 29.Bg8! (not Qh6?? Bf8) Ra1+ (Rxg8 30.Qh6#) 30.Kg2 Qxf2+! (this gives black harmless counter-play unless white goes seriously wrong) 31.Kxf2 Rf8+ (Ra2+ 32.Ke1 Ra1+ 33.Ke2 Ra2+ 34.Kd1 etc runs black out of checks) 32.Ke2 Ra2+ 33.Kd3 Rf3+ 34.Ke4 and black must allow 35.Qh7# or 35.Kxf3 or resign. A..1 26... Bf6 27.Rxc5 dxc5 28.Bxf6 gxf6 29.Qg6 is winning. B.25... Qxd4 26.Bxd4 fxe6 27.Bxg7+ Kxg7 28.Qg6+ Kh8 29.Bg8 Rxg8 30.Qh6# is similar to A main line. Time for review.... |
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Feb-05-16
| | al wazir: <Jimfromprovidence: I do not believe anyone mentioned this, but in the text line 25 Rxe6 fxe6 26 Rg4 e5 27 Qg6, 27...Bf8 instead of 27...Bf6 makes no difference as 28 Qf7 forces mate.> Thanks. That's a lot simpler than the line I came up with. |
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Feb-05-16
 | | gawain: As often happens to me on Fridays, I detected several of the pieces of the solution without fitting them together into a working sequence. The final position is delightful. Black must take the g8 bishop on pain of mate, but both ways of taking the bishop lose in ways that emphasize Black's utter helplessness |
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| Feb-05-16 | | transpose: I found 25 Rxe6 followed by 26 Rg4, but I did not work through the various Black responses, including the game continuation. So I do not consider my guesses to be the solution. Frankly, 28 Bg8 would have eluded me and is a beautiful move. |
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Feb-05-16
 | | Richard Taylor: My solution, I also considered the Rg4 idea among others but didn't spend long on this as the position is clearly winning for White. The initial position after:
24. ... Be6 ...
click for larger view25. Rxe6 fxe6 26. Rd5!
click for larger viewThe rook cuts the Q off from the K-side.
26. ... cxd5 27. Bxg7+ Kxg7 28. Qg6+ Kh8 29. Bg8 Rxg8 30. Qh6# 
click for larger view
White mates 1-0
There are other moves by Black but Black loses in all variations. |
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Feb-05-16
| | Richard Taylor: I see that <devere> was interested in the same line which I consider more beautiful than what was played. The Bg8 idea has been known for a long time.
Once, thinking I had a win, I essayed a move like that (Bg8) missing that a B could get on the diagonal (in this case h2 to b8) and I nearly lost the game a piece down but won by a Q sacrifice (that was really a swindle to save my game with a forced checkmate)... But I saw the Rg4 idea etc.
Black's asset of course are his two Bishops. He exchanged too early in the centre and allowed a strong attack on his King. But such is life and chess. |
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| Feb-05-16 | | The Kings Domain: Good puzzle. The key to the solution noticeable quite early on is black's pesky bishop on e6 which guards key points in white's attack. |
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Kibitzing
sac: 25.Rxe6