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Sep-14-10
 | | OhioChessFan: <VincentL: In the game line, can black play 43.... Rbc8 ? > This is an interesting try. I only have a few minutes but right now I have 43..Rbc8 44. Rxc8 Kxc8 45. Rf2 e4 46. Bh3+ Kb7 47. Rc2 and I think the Pawn decides.
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Sep-14-10
 | | agb2002: The material is even.
The bishop on g4 is defenseless. This suggests 41.c5 and after 41... B<any> 42.cxb6 leaves White with two passed pawns supported with both rooks and the bishop. |
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| Sep-14-10 | | TheaN: Tuesday 14 September 2010
<41.?>
Target: 1:25;000
Taken: 1:15;623
Material: =
Candidates: not that many certain ones before <c5>. -ML-
It took me long enough to see that:
<41.c5> uncorks both an attack on the Bishop on g4 and both pawns on the b- and d-file. Black would be in a hurry to save his Bishop by means of among others: <41....Bd7 42.cxd6†  > and such a strong passed pawn should decide, especially with the White Bishop now free to roam with the Black Bishop stuck to defense. All hail Larsen I'd say, RIP to this controversial GM. |
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| Sep-14-10 | | johnlspouge: < <agb2002> wrote: [snip] 42.cxb6 leaves White with two passed pawns supported with both rooks and the bishop. > Hola, <Antonio>. For what it's worth, I would have played 42.cxb6 as well, for the same reasons. Toga supports 42.cxd6+, however (about 2.5 P vs. 1.5 P), probably because the threats against the Black K become thick and quite immediate after White plays Bg2-h3. |
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| Sep-14-10 | | TheaN: 2/2
Although I have to concur that 42.cxb6 might give White two passers, these aren't so easy to convert. On the other hand, I doubt Black's decision of 41....Bf3?! leaving the h3-c8 diagonal. Seems to me that if Black really wants to continue as he did, 42.cxd6† Kd7? 43.Bh3†! Kd8 (Kc6 44.d7 Kc5 (otherwise Rc4†  ) 45.Rb1 seems to win easily after 46.Rc1† and Rc8) 44.Rc4 with the same threats as after 43....Kc6, the f3 Bishop being void completely at this point. Perhaps 43.Rc4 works but it's a bit more farfetched. |
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| Sep-14-10 | | Patriot: 41.c5 is the only move that came to mind after noticing the loose bishop on g4. I looked carefully for counterplay but saw nothing dangerous and so decided this must be it. White will either win the b-pawn or d-pawn. I considered 41...bxc5? 42.Rxg4 Rb1+ 43.Kh2 but white seems to be safe with a winning game. The game move (41...Bf3) surprised me a little but it's nothing dangerous, which is why I didn't consider it. The finish is an interesting one, since I expected 42.cxb6 at some point (getting connected passers) but the move certainly cannot be played after 41...Bf3. Unless of course, 42.Bxf3 Rxf3 43.cxb6 Rxe3 or perhaps 43...Rxg3. But this does not look as strong as the game line. |
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| Sep-14-10 | | xmachine: 41.c5 was seen easily enough...
and @ Once... I'm sure you get this all the time, but your stories are awesome! :) |
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| Sep-14-10 | | Patriot: My previous post was in error. I stated "... but the move certainly cannot be played after 41...Bf3." For some strange reason I was thinking the bishop on g2 was already captured! So 42.cxb6 is entirely possible there. My apology. |
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| Sep-14-10 | | wordfunph: 41.c5! and Bent gobbles up the d-pawn, easy Tuesday. |
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| Sep-14-10 | | CHESSTTCAMPS: <TheaN: Although I have to concur that 42.cxb6 might give White two passers, these aren't so easy to convert...> I was planning to contest this statement, but in fact, you appear to be right. I entered the position into Chessmaster 10 (with the top level defending black) and the my first attempt continued 41...Rb7! (The *only* chance) 42.a4 Bxg2 43.Kxg2 Ra8 44.Ra2 Ra5 and the game ended in a draw, although I may have missed an improvement somewhere. |
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| Sep-14-10 | | Stormbringer: I got the first two moves. I don't understand why Rc4 is so devastating though, I've been playing around with it and can't figure out how to convert the pawn deep in enemy territory to a game winning advantage. Does it involve driving the king to the back rank and then taking advantage of the black rooks being on opposite sides of the King? |
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Sep-14-10
 | | kevin86: I saw the first few moves-white wins a pawn then the game... |
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| Sep-14-10 | | David2009: Larsen vs B Ostenstad, 1985 White 41? Level material, White is more active. White can win a Pawn with 41 Rdb2 expecting 41...Be6 42 Bd5 Bh3 43 Rxb6. If now 41...Rf1+ 44 Kh2 Rcf8? 45 Kxh3 and Black's 'attack' is all bluff.
If Black exchanges R on b6 White remains a P ahead. Time to
check:
====
Missed it! <Patriot: 41.c5 is the only move that came to mind after noticing the loose bishop on g4.> Exactly. I hadn't noticed the Bg4 was loose. 41 Rdb2 can be met by 41...Bf3 42.Rxb6 Rxb6 43.Rxb6 Bxg2 44.Kxg2 h5 
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This position is drawn although both sides need to play accurately to avoid losing. White's Pawns are weak and Black draws by counter-attacking them. Crafty End Game Trainer link: http://www.chessvideos.tv/endgame-t... Returning to the puzzle position, 
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the win after 41 c5! Be6! 42 cxb6 is there, but is not easy against good defence. Crafty EFT link: http://www.chessvideos.tv/endgame-t... The winning strategy is clear: advance the Pawns and steer for a won K&P ending with the outside passed Pawn. But there are a number of tactical pitfalls on the way. Crafty EGT is very forgiving and unlike a human opponent lets you start all over again. I finally found the win by trial and error. I leave it to the interested kibitzer to find a win with 42 cxd6+ (if there is one). Going for the united passed Pawns seems more thematic, except that they are too far separated to support each other. I think I spent about five minutes analysing the original position (expecting an easy Tuesday win), a further five minutes pasting my "solution" into Notepad - and about three hours (on and off) trying first to win the ending after 41 Rdd2? (no success); then to draw it (achieved with great difficulty and computer help in finding the right way to mobilise White's a Pawn) and finally returning to the puzzle position. |
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| Sep-14-10 | | CHESSTTCAMPS: Just to clarify my earlier comment, I don't doubt that 42.cb ought to win:
click for larger viewHowever, it's not simply a quick march down the board by the a-pawn. I found an improvement in my first unsuccessful attempt against Chessmaster: 42..Rb7 43.a4 Bxg2 44.Kxg2 Ra8 45.Ra2 Ra5 46.Kf3 Kd7 47.Kg4 Kc6 48.Rc2+ Rc5 49.Rcb2 Ra5 50.Rc4+ Kd5 51.Rbb4 Rc5 52.e4+ Kc6 53.a5 Rb8 54.Kg5 (in my earlier attempt, I backed off with 54.Kf3?) Kb7 55.Kh6 Ka6 56.Kxh7 Kxa5 57.Kxg6 Rxb6 58.Rxb6 Rxc4 59.Rxd6 Rxe4 60.Kf5 
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....and the rest is easy for white.
This probably does not represent best play for both sides, but the general plan of invading the black kingside with the king while all the black pieces are tied up defending the passed pawns is a theme in many rook and pawn endings. |
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Sep-14-10
 | | chrisowen: Aha leseesel? Bad dab 8b arc crab part trap brace-car 41.c5 dats nets o Ostenstad. It was saw tie rook ko or g4 grow work kin. I civic loops spool rotor engine enig. near rate e6 draw ward? 14.Ne3 ver. sees 5 snug guns stuck in. Nick cuts cd4 re-6 vent sym. red der myst ere b8 us sub tenet. |
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| Sep-14-10 | | watwinc: All that stuff about lions reminded me that females do most of the hunting ... http://en.wikibooks.org/wiki/Wikiju... |
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Sep-14-10
 | | Domdaniel: <chrisowen> Exquis. A Dansk-inflected bucket of semi-palindromes and emordnilaps, just skewed enough to offset the symmetry. Reminds me of certain artists in the Duchamp line. And the graffiti in Vesterbrogade. |
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Sep-14-10
 | | ajk68: I believe the e, g or h pawn will fall from the final position. 44...Ke8 45. Re7+ (forking e and h pawns)
44...Kd8 45. Kxg2
if 46...Rh8 then 46. Re7
if 46...h4(h4) 46. Rg7 - black cannot move the rook off the back rank to protect the pawns because of Rg8+ (skewer) 44...Ke6 45. Re7+ Kf5 46. Kxg2
if black protects the h-pawn then the e-pawn falls since both rooks can attack it |
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| Sep-14-10 | | wals: Two up.
Black made the first major error.
(+0.83):31...Kg7.
Better,
Analysis by Rybka 4 x64: depth 18: 7 min:
1. = (0.04): 31...d5 32.Rd1 dxc4 33.Rd7 Qb6 34.Rf6 Qc5 35.Bf5 e4 36.Qh6 Re7 37.Rxf7 Rexf7 38.Be6[] Qb6 39.Rxf7 Rxf7 40.Bxc4 Qf6 41.Qf4 Qxf4 42.exf4 Kg7 43.Bxf7 Kxf7 44.Kf2 Ke6 45.Ke3 Kd5 46.h3 b5 2.  (0.34): 31...a4 32.Qh6 axb3 33.axb3 Qe7 34.e4 Qc7 35.Qd2 Qb6 36.Kg2 Qxb3 37.Rxf7 Rxf7 38.Qd5 Qb2+ 39.Kh1 Ref8 40.Be6 Kg7 41.Bxf7 Qe2 42.Kg1 Qb2 43.Rf2 Qd4 44.Kg2 b6 45.h3 More from Black:
(+0.81)38...axb4.
Better,
depth 22: time 6 min:
1. = (0.25): 38...Rd7 39.bxa5 bxa5 40.Rd5 Rc8 41.Rxa5 Be6 42.Ra4 Ke7 43.Bf1 Rdc7 44.e4 Bd7 45.Ra3 Bg4 46.Rc2 h5 47.Ra6 Be6 48.Ra4 Rb8 49.Kg2 Rb1 50.Ra8 Rd1 51.Be2 Rd4 2. (0.29): 38...Ke7 39.bxa5 bxa5 40.Rd5 Bf3 41.e4 a4 42.a3 Ke6 43.Rb1 Bxg2 44.Kxg2 Rb8 45.Rdb5 Rbc8 46.R1b4 Ra8 47.Rb7 h5 48.c5 Rac8 49.Rg7 Rxc5 50.Rxg6+ Rf6 Black blunder:
(+1.79):40...Rb8
Better,
depth 20: 10min:
1. (0.79): 40...Be6 41.Rxb6 Bxc4 42.a4 d5 43.Rb4 h5 44.e4 Rb8 45.Rdb2 Rxb4 46.Rxb4 Kd6 47.exd5 Kc5 48.Rb7 Rd8 49.a5 Bxd5 50.Bxd5 Rxd5 51.a6 Rd6 52.a7 Ra6 53.Kf2 Ra3 54.Rg7 Kd5 55.Ke2 e4 2. (0.98): 40...Rd7 41.Rxb6 Rc8 42.Bc6 Rdc7 43.Bb5 Rd8 44.a4 Be6 45.a5 Bxc4 46.Bxc4 Rxc4 47.Ra2 Kd7 48.a6 e4 49.Kg2 Rc6 50.Rb7+ Rc7 51.Rb4 d5 52.Rb6 Ra8 53.Rf2 Ke7 54.Rd2 Rc3 55.Rxd5 Rxe3 (+2.68):41...Bf3. another bad move from Black who resigned move 44. |
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| Sep-14-10 | | Brandon plays: This puzzle was pretty easy for the most part. I kept on seeing tempting moves by white until I finally hit upon b4 which seems pretty good for white. He gets this nice pawn on the six rank and everything;) |
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| Sep-14-10 | | zooter: 41.c5 attacks the loose bishop on g4 and after black either moves it or protects it, 42.cxb6 should be winning for white due to the connected outside passers Time to check |
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| Sep-14-10 | | ZUGZWANG67: Material is equal in this endgame. White has has a tactic, namely a discovery when the c-pawn advances. Here's what I get: 41.c5 Be6 42.cxb6;
I think this is better than 42.cxd6: my suggestion obviously creates 2 connected passers on the Q-side, while the b7 is not available for blockading, nor is a8 for attacking the a-pawn. It is my opinion that 43.a4 should follow. Strangely, I feel like I'm missing something. Time to check... -----
Hm. 42.cxd6. Interesting, though I don't have time for investigation. |
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| Sep-14-10 | | turbo231: How does c5 harm the bishop at g4? |
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| Sep-15-10 | | turbo231: Duh, I see now a discovered check on the bishop. I must be blind. |
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Sep-21-10
| | chrisowen: <Domdaniel> Late as usual la u sus a eta lame. Emale c5 in ad caned de nac <dani> celt, am moct rook over rev ok? O or id made lion no i led am dim metal late ogre ergo in nik of time. Emit fo g4 gerkin re nile pawn flow. Wolf n wap else estate eta two own grab bargain niagara gob bog maj. jam. A rag name skool looks dim mid emancipation no it d6 da pic now worm mr B.Os sob. |
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Kibitzing
sac: 43.Rc4