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Oct-04-09
 | | al wazir: I didn't get it, but I get it now. If 24...Qxh3, then 25. Qc2, threatening mate, and 25...Rf7 (25...Bxe7 26. Qg6+ Kh8 27. Rxe7) loses to 26. Qg6+ Kh8 27. Rxf7). |
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| Oct-04-09 | | VincentL: White is materially down a bishop for two pawns.
I have been looking at this position for a few minutes. White needs to get his queen into the play. I am thinking about the line 24. Nh4 Bxh4 25. R(e7)e5 Now white is a bishop and knight down for two pawns, so black could play 25... Qxe5, and after 26. Rxe5 black would have a bishop, knight and rook for a queen and two pawns. This is materially about even, although now the black king is very exposed. There are other possible responses from back on move 24. He could play 24. Qf5 Now I don't see how to continue.
I do not think I am on the right track here. |
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| Oct-04-09 | | VincentL: As I thought.
I am way off line.
I considered Bh3, but did not see the proper continuation. Roll on Monday. |
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Oct-04-09
 | | An Englishman: Good Evening: Too easy, as was Saturday's. After two months of going 3/7 or 4/7, this week was my first 7/7 in almost a year. I'll never understand chess. |
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| Oct-04-09 | | jpcsacristan: correct me if i'm wrong, i think after 24. Bh3 Qxh3 25. Qd3 is a good move.. |
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| Oct-04-09 | | Athamas: Black has a bishop to white's 2 pawns. White has a pretty strong attack with the doubled rooks and black's exposed king. This one was a lot easier for me than yesterday... I spent probably 15 minutes yesterday, only about 5-10 today. First impulse is of course the c7 pawn, but simply Bd8 is winning for black. What else does white have? Knight moves do nothing, the queen wants to take advantage of the diaganol the black queen is on, but the rook is under attack as well. This points towards... 24. Bh3
Now if Qxh3, Qd3... and black is in big trouble. Threatening immediate mate on h7, so black would be forced to do Bxe7, Qg6+ Kh8, Rxe7 ??, Qh7#... The black queen also cannot leave the diaganol...Qh5, Qd3 Bxe7, Rxe7 Rf7, Be6 Rf8, g4 Qh3, Bxf7+ Rxf7, Qg6+ Kh8, Rxf7 ??, Qh7# 24...Qg6
This relieves the pressure on the f2 square for white, but still does not allow Qd3 and maintains Bxe7 threat. 25. R1e6
Threatening Nd5 Qg5, f4... but I don't see a good response for black. Most natural is Rae8 or Rf7, but they're both terrible responses. Qh5 just leads to the other variation. 25...Nc4 26. Nh4 Qg5 27. f4
And the party's over. There might be a better attacking variation to go for the king, but I see that easily wins. |
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| Oct-04-09 | | VincentL: <al wazir>Wbat happens if black plays 24....Qg6 ? |
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| Oct-04-09 | | Athamas: Odd, a puzzle that only lists the first move of the variation... I wonder if my analysis is correct... engines? lol |
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| Oct-04-09 | | Athamas: Looks like I messed up the end of my calculation. If 25...Nc4 simply 26. Rxc6 wins much easier. |
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| Oct-04-09 | | DarthStapler: I at least considered the first move |
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Oct-04-09
| | al wazir: <VincentL: Wbat happens if black plays 24....Qg6 ?> 24. Bh3 Qg6 25. R1e6, with the idea of playing 26. Ne5. If 24...Qh5, then 25. Qc2/Qd3 Rf7 26. Rxf7 Kxf7 (26...Qxf7? 27. Be6) 27. Qh7+ Bg7 (27... Kf8 28. Ne5 Bxe5 29. Rxe5, with several threats) 28. Ne5+ Kf8 29. Ng6+ Kf7 30. Re7+ Kf6 31. Qxg7+ Kg5 32. Re5#. As I see it, to solve the problem all we have to do is find a continuation for white that doesn't lose. Even a draw would be better than what transpired in the game. |
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| Oct-04-09 | | Anatoly21: This took me forever, but I think I finally got it. So here's my "I don't have any computer software right now" analysis: 24.Bh3
Two major replies:
24...Qxh3 25.Qb1 Bg7 (what else?) 26.Qg6 and Black can go grab a beer 24...Qg6 25.Rxc7 and Black has seemingly only good way to stop the deadly b4 (don't hear that everyday). 25...Be8 26.Ne5 Bxe5 27.dxe5 and the dual threat of e5 and Qxd5 is simply too much. Corrections on my analysis is appreciated. |
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| Oct-04-09 | | dzechiel: White to move (24?). White has two pawns for a bishop. "Insane." With white down in material, it's clear that he's not just trying to get back to parity, but that white will be aiming for the almost naked black king. The only thing that seems to stand in the way is the black queen. Many of the black pieces (the rook on a1, the knight on a5 and the bishop on c6) will not be of use in defending the king, so it's OK to throw another piece into the fire to get the black queen out of the way. I think
24 Bh3
is in order. Black doesn't have time to take the rook on e7 with the bishop as after 24...Bxe7 25 Bxf5 Rxfr 26 Rxe7 black would be in a real world of hurt. But I don't think black can even take the offered bishop, eg: 24...Qxh3 25 Qd3
threatening mate with 26 Qh7#.
25...Bxe7 26 Qg6+ Kh8 27 Rxe7
and there's no stopping the mate. Other moves such as 25...Rf7 26 Qg6+ Rg7 27 Qxf6 aren't much better. Nope, back on move 24 I think black better play 24...Qg6
Other squares lose the queen or allow the white queen unnecessary access (24...Qh5 25 Qd3). I think this is where it gets interesting. White has several interesting moves here. I would consider - 25 R1e6
- 25 Be6+
- 25 Ne5
- 25 Nh4
- 25 Rxc7
The rook move would pin the bishop against the queen and prevent it from taking our rook on e7. The bishop check would force 25...Kh8, but I'm not sure what's going on after that. The knight moves attack the queen, and if black doesn't want to move the queen again, he has to get rid of one of his key defensive pieces. Finally, the rook capture on c7 saves the rook and maintains the seventh rank, but it's not very forcing otherwise. OK, I'm going out on a limb here, but I like
25 Ne5
Trying to chase the queen off of the b1-h7 diagonal. Black pretty much has to capture the knight with 25...Bxe5
as after a queen move like 25...Qg5 26 h4 traps the queen in the middle of the board. Now... 26 R1xe5
and once white gets in 27 Rfe6 black will have to abandon the long diagonal allowing the queen access. The above may be a complete fantasy, but that's the best I got. Time to check and see how this really went down.
P.S. The Dodgers *finally* clinched tonight, one day too late for me. |
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| Oct-04-09 | | Eduardo Leon: I don't blame white for not finding <24. Bh3> over the board. Definitely insane. |
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| Oct-04-09 | | lost in space: It took me a while to find
24. Bh3! Qxh3 25. Qc2(d3,b1) Bxe7 26. Qg6+ (not 26. Rxe7 Qf5 and not mate) 26...Kh8 27. Rxe7 and mate to follow Alternatives for Black:
24...Qg6 25. R1e6 Be8 (25...Rae8 26. Nh4 Qg5 27. f4 Qxh4 28. gxh4 Rxe7 29. Rxe7 Bxe7 30. Qg4+ Kh7 31. Qe6 Bf6 32. b4! Be8 33. bxa5 clearly enough to win for white) 26. Nh4 Qh5 27. Qd3 Bxe7 28. Rxe7 Rf7 29. Re5 Rf6 30. Rxh5 Bxh5 31. g4 Bf7; White is up 2 pawns) 24...Qh5 26. Qb1 Bxe7 26. Rxe7 Rf5 27. Bxf5 Kf8 g4; Black is lost 24...Qxf3 25. Be6+ Kh8 26. Qxf3 Bxe7 27. Qh5 Rf6 28. Bf7 Bf8 29. Re6 Rxe6 30. Bxe6 Bg7 31. b4 Nb7 32. Bxd5; enough to win for white. |
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| Oct-04-09 | | ongyj: WOW to everyone who managed to solve this. Not sure if it's worth a mention, but a 'straightforward move' like 24.Rxc7 seems to fail to 24...Bd8. (Not checked with Engine, just feeling, could be wrong on that) |
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| Oct-04-09 | | alshatranji: I thought of 24.g4 with the same idea, removing the queen from the b1-h7 diagonal. But now I can see that Qg6 saves Black. |
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| Oct-04-09 | | lost in space: Best line according to Rybka (no sliding):
24. Bh3 Qg6 25. R1e6 Rae8 26. Nh4 Qg5 27. Rxc7 Bd8 28. Rcxc6 Nxc6 29. Rg6+ Qxg6 30. Nxg6 Rf7 31. Bg2;
+6,9
This is much better than my 27. f4 |
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| Oct-04-09 | | Philistine: I got this one. I think I've only solved a Sunday puzzle one other time. The concept on this one was clear and the calculations were pretty straight forward once you saw it. This seemed more like a Friday level puzzle to me. Anyone else feel the same way? |
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| Oct-04-09 | | goodevans: Not even close today. I guess if you recognise h7 as the weak square then it's not too hard, but that was where I failed. Nice game. I wonder if it will ever make GOTD. If so the punsters will have a field day! |
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| Oct-04-09 | | whiteshark: No success today.
<24.Nh4?> didn't work due to 24...Bxh4 25.gxh4 Rae8. Otherwise... <24.Rxc7> was finally my choice, but after 24...Bd8 25.Re5 Qf6 26.Rxc6 Nxc6 27.Rxd5 I couldn't find anything that looks like a win. |
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| Oct-04-09 | | johnlspouge: Sunday (Insane):
E Limp vs A Rodriguez, 2001 (24.?) White to play and win.
Material: Down B for 2P. The Black Kg8 has 1 legal move, h8, so a mate probably requires a heavy piece to cover h8. White has a battery Re1 and Re7. The Black Qf5 protects the weak light squares around Kg8, suggesting deflection of Qf5. The Black Bf3 attacks Re7, so any aggressive candidate threatens at least a R. The Black Q-side is essentially out of play, giving White the local superiority on the K-side necessary for a sacrificial mating attack. White must activate Bg2 and Nf3, and also particularly Qd1, if a mating attack is to succeed. The White Kg1 is secured from check. Candidates (24.): Bh3
24.Bh3
(1) Black cannot accept Bh3:
24…Qxh3 25.<Qd3> (threatening 26.Qh7#) <[Toga calls mate-in-8 after 25.<Qc2>. Just to show how bad things are for Black, 25.Qd3 permits 25…Qf1+ 26.Bb5 Qxb5 as a delaying tactic.]> 25…Rf7 [Bxe7 26.Qg6+ Kh8 27.Rxe7 and mate soon] [Bg7 26.Qg6 and mate soon] 26.Qg6+ Rg7 [else, 27.Qxf7]
27.Rxg7+ Bxg7 [else, mate next move]
28.Re7 (threatening 29.Qxg7#)
Black has no defense against the mate.
Black cannot accept Bh3, so 24.Bh3 activating the White pieces must be best. (In my opinion, the refusal of Bh3 is now worth exploring only as a part of a puzzle.) The Black Qf5 must flee to g6 or h5, but its lack of flight squares is now a major embarrassment to Black. (2) 24…Qh5
Candidates (25.): Qd3, Be6+
25.<Be6+>
<[Toga prefers 25.<Qd3> by about +2.5 P, but confirms the variation below as winning at better than +2 P.]> 25…Kh8 26.g5 Qh3 [Qg6 27.Bh5 wins Qg6]
27.g5 (threatening 28.Bxh3 or 28.gxf6)
27…Qh5 28.gxf6 Qg6+ 29.Kh1 (threatening 30.Ne5)
After Black captures Pf6, White is up a P with an aggressive position because of the threat Nf3-e5-g6+. (3) 24…Qg6 25.R1e6 (threatening 26.Nh5 Qg5 27.f4, trapping Qg6) 25…<h5>
<[Toga prefers 25.<Rae8> Ne5 as best defense and response, but values 25...h5 at about +3.7 P anyway.]> 26.Nh5 Qh6 27.Nf5 Qg5 [Qg6 28.Rg7+] 38.f4 Qg6 39.Rg7+ White has won material against an open Black Kg8.
I managed to stay awake today, after a very bad week. |
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| Oct-04-09 | | johnlspouge: < <Philistine> wrote: [snip] This seemed more like a Friday level puzzle to me. Anyone else feel the same way? > If the importance of Qf5 and its defense of the light squares around Kg8 caught your eye, the puzzle probably seemed easy. (See <dzechiel>'s excellent preliminary assessment.) Some chess maturity is required to observe the burden Qf5 bears and then, as a reflex, overload it. I can easily imagine myself 2 years ago, however, trying everything else before 24.Bh3. |
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| Oct-04-09 | | johnlspouge: < <Athamas> wrote: [snip] I wonder if my analysis is correct... engines? lol > The engine analysis is on me :)
I figure I owe it to you after yesterday's debacle :>P |
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| Oct-04-09 | | BOSTER: In this case open and weakend black King is decisive factor for combo.
The most attractive spot for white queen is the square h7. It means white has to conque the diagonal b7-h7.
So 1. 24.Bh3-deflection
Qxh3
25.Qd3 Bxe7
26.Qg6+ Kh8
27.Rxe7 and mate in couple moves.
2. 24.Bh3 Qg6
25.R1e6 the threat b4 and Rxc6 Bb5
26.Nh4 Qg5
27.f4 and Queen is trapped Bxe7
28.fxg5 Bxg5
29.Qh5 and white wins because Ra8 and Na5 too far from battle.
3. 24 Bh3 Qh5
25.Qd3 Be7
26.Rxe7 Rf7
27.Be6 Be8
28.Ne5 and white is better. |
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