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Jan-25-09
 | | whiteshark: <21...g6> looks like the only playable move here. After <22.Qxb2 gxf5 23.Rxf5 Rc2 24.Qb4 Rfc8> the outcome of the game is ∞. 
click for larger view |
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| Jan-25-09 | | DarthStapler: I at least considered the first move |
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Jan-25-09
 | | Jimfromprovidence: <<whitexhark> <21...g6> looks like the only playable move here. After <22.Qxb2 gxf5 23.Rxf5 Rc2 24.Qb4 Rfc8>> I really liked the move 23...Rc2 in this continuation. 
click for larger viewNow if 24 Qxc2?, then 24...Qxd4+ evens the match.
Black forces white has to play 24 Qb4 to protect his d pawn. |
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| Jan-25-09 | | Patriot: White to play: "Insane"
I gave myself a 20-minute think on this and decided that 20.Rxf6 had very good prospects--it's probably the only move that gives white winning chances. For example, 20...gxf6 21.Nh5 (threatening 22.Nxf6+ and 23.Nxd7) 21...Kh8 22.Nxf6 Qe7 23.e5 maintaining a grip and threatening 23.Qh5. (Not 23.d5 Nxb2 24.Qxb2 with discovered checks possible but is likely about even.) Or if 20...Nxb2 21.Nf5! threatening 22.Qg4 g6 23.Nh6+ winning the queen--a very common theme. (21...gxf6 22.Qg4+ and mate next) There are so many variations to consider here and I certainly couldn't analyze everything in 20 minutes but just had to try the Rxf6 line because it seemed to lead in a positive direction for white. I'm sure <dzechiel>, <johnlspouge>, and others on this site are much better at balancing time with analysis than I am but hopefully one day I will get there. |
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| Jan-25-09 | | TheChessGuy: Interesting puzzle. 20.Rxf6! is the move I looked at right away, being more of an attacking player. When I realized that it gave White solid winning chances, I smiled like the Cheshire Cat. The late, great Tigran Petrosian would have happily parted with the exchange here. |
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| Jan-25-09 | | njchess: I got this sequence, although it took me a minute to find Rf1. I think the hard part was not being distracted by Nxb2. Rf1 nicely anticipates g6 as the reply to Qg4. From there, White's attack is overpowering. |
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Jan-25-09
 | | agb2002: I think I would try 20.Rxf6:
A) 20... gxf6 21.Nh5
A.1) 21... Qe7 22.Qg4+ Kh8 23.Qg7#.
A.2) 21... Qe6 22.d5 Rc2 23.Qxc2 winning.
A.3) 21... Kh8 22.d5 Nxb2 23.Qxb2 Qe7 24.Nxf6 Rc4 25.Rf1 (25.Nd7+, recovering the exchange, is probably not so strong) with a winning attack because the dark squares are too weak. A.4) 21... Rc6 22.d5 Rd6 23.Bxf6 again with a winning attack. B) 20... Nxb2 21.Nf5
B.1) 21... Na4 22.Qg4 g6 23.Nh6+ and 24.Qxd7 winning. B.2) 21... Kh8 22.Rd6 Qe8 23.Qxb2 with a knight ahead. B.3) 21... g6 22.Qxb2 gxf5 23.Rxf5 with a pawn up and a considerable advantage. B.4) 21... Qd8 22.Rd6 as B.2).
Let's check.
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| Jan-25-09 | | spreadsanity: Black's move 21 looks weak to me, I think 21... Qa4 is a lot more promising, a lot of white's advantage is negated. |
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| Jan-25-09 | | Nullifidian: <spreadsanity:> <Black's move 21 looks weak to me, I think 21... Qa4 is a lot more promising, a lot of white's advantage is negated.> I don't think this would have saved the game for Black. After 21. ... ♕a4 22. ♕g4 ♙g6 23. ♙e5 ♖c7 24. ♙e6 fxe6 25. ♘h6+ ♔g7 26. ♖xf8 ♔xf8 27. ♕f4+ picks up the other rook and White is winning. |
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| Jan-25-09 | | Woody Wood Pusher: Wow I got the first move! Soon Sunday's will be a walk in the park! |
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| Jan-25-09 | | soberknight: Yeah I got the first move too, but it was more like "well this must work because otherwise they wouldn't ask us" and I didn't see the continuation. |
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| Jan-25-09 | | WhiteRook48: why are a lot of Sunday puzzles "insane?" |
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Jan-25-09
 | | An Englishman: Good Evening: <WhiteRook48>, Sunday puzzles are usually insane because we'd be nuts to try and solve them. I've been a member for several years, and this is the first time I've gotten two consecutive Sundays correct--and I thought I was wrong this week! |
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| Jan-25-09 | | FizzyY: sac sac mate |
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| Jan-26-09 | | MostlyAverageJoe: < spreadsanity: Black's move 21 looks weak to me, I think 21... Qa4 is a lot more promising> Black should've played 21...g6 and there would be plenty of game left. 21...Qe8 was pretty much useless and started a quick descent into an abyss.. |
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Jan-26-09
 | | patzer2: White solves the Sunday, Jan 25, 2009 puzzle with an attack on Black's weakened castled position via 20. Rxf6! |
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Jun-20-21
| | agb2002: Level 3.5: 24.?
Capablanca vs Blackburne, 1914
click for larger view |
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| Jun-20-21 | | Brenin: Playing 20 Rxf6 is hard to resist, and whether Black takes the R or the B on b2, the resulting K-side pressure is going to be overwhelming. OTB I'd play it without spending much time analysing Black's responses. |
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| Jun-20-21 | | Walter Glattke: 12:46 CET getting connection.
The "positional quality sacrifice" of course 20.Rxf6 Nxb2 21.Nf5 g6 22.Qxb2 gxf5 23.Rxf5 Looks ugly for black
Plan B: 20.-gxf6 21.Nf5 Kh8 22.d5 (Qg4? Rg8) Qd8 23.Bd4 Nc5 now what?
Ah, not Nf5, agb plays C) 20.Rxf6 gxf6 21.Nh5!!---21.-Qe6 22.d5++- 21.-f5 22.Nf6+ Kg7 23.Nxd7 ++-
20.-Nxb2 21.Qxb2? (Nh5? Qxd4+) gxf6
My first example and B3 of agb seems to be the best |
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Jun-20-21
 | | chrisowen: Lunchtime i keys luft Rxf6 garrulous abridged it log i keys link a huffle ruffle feathers i keys loquacious i varsity trusted its deep keys u bluff faking its wankel engine keys quagmire o keys moggy joy yum its virgins height dents baffle fly its zoom i keys its whip pack keys totadd idled its duff i keys blubbers buy awooga job cite afford be keys rooks keys i jaffa its linz its cop keys kestrel its hems its daybreak u Rxf6 eddy; |
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| Jun-20-21 | | mel gibson: I saw that but it looked risky.
Stockfish 13 says.
20.Rxf6
(20. Rxf6 (♖f1xf6 ♘a4xb2 ♘g3-f5 g7-g6 ♕e2xb2 g6xf5 ♖f6xf5 f7-f6
♕b2-b3+ ♔g8-h8 ♖a1-d1 ♖c8-e8 ♕b3-f3 ♕d7-e7 ♖d1-e1 ♕e7-d6 ♕f3-f2 b6-b5 h2-h3
a7-a6 ♔g1-h1 ♖e8-d8 d4-d5 ♖d8-e8 ♕f2-d4 ♔h8-g8 ♖e1-f1 ♖e8-e5 ♖f5-f3 ♖e5-e7
♕d4-d3 ♕d6-e5 ♖f3-f4 ♔g8-h8 ♕d3-d2 ♕e5-d6 ♕d2-f2 ♔h8-g7 ♕f2-b2 ♖e7-e5
♕b2-d2 ♔g7-h8 ♕d2-f2 a6-a5 ♕f2-a7 b5-b4 ♕a7xa5 b4xa3 ♖f1-f3 ♕d6-e7 ♕a5xa3
♕e7xa3 ♖f3xa3 f6-f5 ♖a3-f3) +3.42/45 662)
score for White +3.42 depth 45 |
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| Jun-20-21 | | Hercdon: When will the analysis engine be back? |
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Jun-20-21
| | An Englishman: Good Morning: Thought this one looked familiar. Oh, well, nothing wrong with a 5/5 with 2 known week. |
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Jun-20-21
| | Jimfromprovidence: <whiteshark> <21...g6> <looks like the only playable move here. After> <22.Qxb2 gxf5 23.Rxf5 Rc2 24.Qb4 Rfc8>
click for larger view I liked this line in '09 and I still like it in '21. There are a lot of attacking-counter-attacking moves I missed back then. For example, 24 Qb4 in this sequence besides preventing 24...Qxd4+ also threatens Rg5+ with mate next move. Plus after 24...Rfc8 white must play 25 d5 to now prevent 25....Qxd5+. |
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Jun-20-21
| | Jimfromprovidence: Oops. I meant 25...Qxd4+ in my previous post. |
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