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| Sep-05-09 | | Aristarchos: Could someone please tell me why Djurhuus resigned? |
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Sep-05-09
 | | johnlspouge: Saturday (Very Difficult)
Serper vs R Djurhuus, 1991 (18.?) White to play and win.
Material: Up a N. The Black Kc7 has 5 legal moves. Black threatens 18…gxh4, to capture Bh4 (which has no flight square), and 18…Bxf6, to capture Rf6. The precarious position of Bh4 and Rf6 suggest desperado or double-defense tactics, perhaps 18.Nh5, to provide Bh4 with a flight square, while counter-attacking. The centralized Black Ne5 is a key defensive piece, preventing 18.Rxf7, forking Kc7 and Bg7. The Black Bg7 indirectly supports Ne5. The White Kg1 is vulnerable only to 18…Nf3+. Candidates (18.): Nh5
18.Nh5 (counter-attacking Bg7 and giving Bh4 a flight square) 18…Bxf6 [gxh4 19.Nxg7] 19.Bg6 (threatening 20.Nxf6 or 20.Bxe5) Black cannot protect Bf6 (Bg6 now pins Ne5, preventing the double defense 19…Nd7). To avoid capture, Bf6 must therefore abandon Ne5 (which can be captured with check). After capturing either Bf6 or Ne5, White has 2 minor pieces for a R. |
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Sep-05-09
| | johnlspouge: < <NBZ> wrote: That was quite simple for a Saturday. [snip] > Indeed. Where was the puzzle?
< <TheBish> wrote: [snip] Maybe I'm missing something, time to check. > I know how you feel. I spent most of my time ensuring that I had not made some egregious oversight. |
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| Sep-05-09 | | LIFE Master AJ: 31.Nb6 was not a very good move ... |
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| Sep-05-09 | | LIFE Master AJ: <<Sep-05-09 <Aristarchos:> Could someone please tell me why Djurhuus resigned?>> Good question ... I see no decisive win ... maybe he lost on time? |
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| Sep-05-09 | | vonKrolock: Yes, the game remained unfinished... Some idea to suggest a continuation !? 
click for larger view 32.♘c4 ♔a8 (nothing better than trying to repeat positions...) 33.d6 and white is winning (well, it seems that ♗d6 instead wins too, but this is a <computer move>, with a lack of a certain pattern - it blocks, for a start, the passed ♙ |
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| Sep-05-09 | | remolino: He resigned becaused the "c" pawn will be lost as well, e.g., 32. Nc4 Ka8 33.Bd6 |
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| Sep-05-09 | | David2009: Saturday's puzzle Serper vs R Djurhuus, 1991 White to play 18? Very difficult A lot has happened in the first 17 moves!
White is temporarily a piece ahead and can try to win two pieces for a R by playing
18 Nh5 Bxf6 19 Bg3. Black cannot save the attacked B.
It is not worth analysing all possible Black replies. This is what I would play over the board.
Time to check.
=====
So far so good, time to read comments from other solvers. |
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| Sep-05-09 | | Summerfruit: White is a knight up.
White has both Rf6 and Bh4 en prise, so it seems that black can regain the piece. 18.Nh5! Bxf6 (gxh4 19.Nxg7) 19.Bg3!
Black is now an exhange up, but has the bishop threatened and the knight pinned.
Obviously the bishop can't move so black can try e.g.: 19...Kd6/Re8/Ra5 20.Nxf6
White has B+N for a rook. |
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Sep-05-09
 | | kevin86: Without the king's bishop,black's game went down the drain. |
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Sep-05-09
 | | playground player: My candidate moves: 1) Resign 2) "Accidentally" upset the chessboard 3) Jump onto table and scream, "Why must I lose to this idiot???" 4) Suggest a friendly game of Monopoly --Way out of my league! |
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| Sep-05-09 | | Athamas: Interesting. I had considered moving the king to the center of the board for black, but moving out into the open just seems so.... bad. But moving to Ke6 is better than Kb7 and an active rook? That is hard for me to completely understand. What does the computer give the game score after Kb7? |
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| Sep-05-09 | | LIFE Master AJ: White was already a piece ahead, however, I NEVER saw anything like a clear win. After about 5-10 minutes, (and trying just about everything else); I did find 18.Nh5 and 19.Bg3. (White remains with two pieces for a Rook.) And while this means that White is definitely better, a KNOCK-OUT blow was impossible to see over the board. |
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| Sep-05-09 | | LIFE Master AJ: The line that I saw (only looking at the board - my eyes are not as good as they used to be, I often transfer the diagram to a chess board) ... For the record, my line was: 18.Nh5, BxN/f6; 19.Bg3, Kb7!?; 20.Nxf6, Nd7; 21.Nxd7, Bxd7; 22.Bc4, "  " Of course, in reality, White is winning here ... at least according to Fritz, that is true. Of course, my analysis is inferior to the machine's here. However, I am content to find reasonably good moves and and that I did a decent job of appraising the position. |
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Sep-05-09
 | | agb2002: White is a knight up but Black threatens 18... Bxf6 and 18... gxh4. The defenseless bishop on g7, the possibility of pinning the black knight with Bg3 and forking the black king and the rook on h8 if White's DSB takes on e5 suggest 18.Nh5: A) 18... Bxf6 19.Bg3
A.1) 19... Kd6 20.Nxf6 Ke6 21.Ng4 [B+N vs R].
A.2) 19... Be7 20.Bxe5+ and 21.Bxh8 + - [2N up].
A.3) 19... Re8 20.Nxf6 [B+N vs R].
B) 18... gxh4 19.Nxg7 Rg8 20.Nf5 + - [N up].
C) 18... Bf8 19.Bg3 Bd6 20.Rxd6 Kxd6 21.Ne3 Re8 (21... Ba6 22.Bxa6) 22.Nc4+ + - [B+2N vs R]. D) 18... Rg8 19.Nxg7 Rxg7 (19... gxh4 20.Nf5, line B) 20.Bg3 + - [2N up]. E) 18... Nd7 19.Rxf7 Bd4+ 20.Bf2 + - [N+P up].
F) 18... Ng4 19.Rxf7+ and 20.Rxg7 + -.
Not very satisfying but I can't spend much time on this puzzle today. |
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Sep-05-09
| | johnlspouge: < <LIFE Master AJ> wrote: The line that I saw (only looking at the board - my eyes are not as good as they used to be, I often transfer the diagram to a chess board) [snip] > Hi, <LIFE Master AJ>. One of the strongest kibitzers I have encountered on this site was a psychology student, <UdayanOwen>. (Alas, he apparently found greener pastures.) <UdayanOwen> claimed [ A Filipenko vs F Lipinsky, 2000 ] that if you set up pieces on a board (without moving them), you improve more than if you use the CG diagram. Personally, I am too lazy to set up pieces, but in any case, you have no reason to be apologetic (and I am very sympathetic about your eyes :) |
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| Sep-05-09 | | wals: [Event "Gausdal"]
[Site "Gausdal"]
[Date "1991.??.??"]
[Round "8"]
[White "Grigory Serper"]
[Black "Rune Djurhuus"]
[Result "1-0"]
[ECO "E70"]
[WhiteElo "2522"]
[BlackElo "2456"]
[Annotator "Rybka 3 1-cpu (30m)"]
[PlyCount "62"
{E70: King's Indian: Miscellaneous lines
1. c4 Nf6 2. Nc3 g6 3. e4 d6 4. d4 Bg7 5. Nge2 c6 6. Ng3 a6 7. Be2
b5 8. O-O (8. e5 dxe5 ) 8... e5 (8... h5 9. f3 ) 9. dxe5 dxe5 10.
Qxd8+ Kxd8 11. f4 White threatens to win material: f4xe5 (11. Rd1+ Ke7 )
11... Nbd7 12. fxe5 (12. Bd2 Kc7 ) 12... Nxe5 A comfortable square for
the black knight 13. cxb5 axb5 14. Bg5 b4 (14... Ke7 is worthy of
consideration 15. Bxb5 Decoy: b5 cxb5 16. Nd5+ Kf8 17. Nxf6 Be6 ) 15.
Rxf6 Kc7 16. Nd1 (16. Nb5+ cxb5 17. Rc1+ Kb7 18. Rc5 ) 16... h6
♗lack threatens to win material: h6xg5} 17. ♗h4 g5 ?<dubious> (17... ♖h7 and
♗lack can hope to survive) 18. Nh5 Bxf6 19. Bg3 Ra5 (19... Kd7 20.
Nxf6+ Ke6 ) 20. Nxf6 Kb7 21. Be1 c5 (21... Be6 22. a3 c5 23. Ne3) 22.
Ne3 Be6 (22... Ng6 23. Bg3 Be6 24. Nc4 ) 23. Bg3 Nc6 (23... Ng6 24. Nc4 Raa8
25. Nd5 ) 24. Nc4 Ra7 (24... Raa8 25. Nd6+ Kb6 26. Nd5+ Bxd5 27. exd5 $18)
25. Nd6+ Kb6 (25... Ka8 cannot undo what has already been done 26. Nd5 )
26. Nd5+ Bxd5 27. exd5 Nd4 28. Nc4+ Kb7 (28... Kb5 a fruitless try to alter
the course of the game 29. Bd3 Rd8 30. a4+ bxa3 31. Nxa3+ Kb6 32. Nc4+ Kb7 33.
Re1 ) 29. Bd3 Rd8 (29... Rha8 does not win a prize 30. Re1 ) 30. Re1
Ka8 (30... Ka6 cannot change what is in store for ? 31. Bd6 Nb5 32. Bxc5 )
31. Nb6+ (31. Bd6 and the rest is a matter of technique Nb5 32. Bxc5
) 31... Kb7 1-0
The above may be of interest to those seeking help. |
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Sep-05-09
 | | fm avari viraf: Though, the puzzle is very difficult, but after a cursory glance, my ratiocination suggests that White Knight leaps to h5 attacking Bg7 and vacating g3 for the stranded B on h4. Hence, 18.Nh5 Bxf6 19.Bg3 Kd6 20.Nxf6 Ke6 21.Ng4 Nxg4 22.Bxg4+ Kf6 and White has no quick win. Therefore, if Black plays 19...Kb7 20.Nxf6 Nd7 21.Nxd7 Bxd7 22.Bc4 with advantage. |
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| Sep-05-09 | | njchess: Black resigns for three reasons 1) he is already a piece down, 2) White's passed pawn is worth at least one one of Black's minor pieces and 3) Black's king is no position to help his position. Black is condemned to fight a defensive battle with little or no counterattacking chances. He faces a slow painful demise, or maybe a mating net. Time to resign. |
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| Sep-05-09 | | 5hrsolver: I got this one. Actually I found yesterdays puzzle more difficult. |
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| Sep-05-09 | | WhiteRook48: i could not get this one
doesn't serper love the nge2 variation? |
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| Sep-05-09 | | CHESSTTCAMPS: Whtie is a knight up, but the Rf6 and the Bh4 are under attack, so at first glance it looks as if white must give a piece back. However, it quickly becomes apparent that there is a trick to maintain a material advantage: 18.Nh5
Now if
A) 18... gxh4 19.Nxg7 simply leaves white a piece ahead again. Attempts to exploit the semi-open g-file don't seem to go anywhere, e.g. 19... Rg8 20.Nh5 Bh3 21.Nf4 B) 18...Nxf6 19.Bg3!
The point: the Bf6 must fall, giving white an advantage of two minor pieces for a rook, an advantage of about 1.5 pawns. It is tempting to terminate analysis and declare it won for white, but I'll look at one line to get a feel for the endgame. B.1) 19... Kd6 20.Nxf6 Ke6 21.Ng4 (21.Nh5 Ba6 trades bishops with white having less activity) Nxg4 22.Bxg4+ Ke7 23.Ne3 Bxg4 24.Nxg4 Hmmm - still looks like a tough endgame. I'll check it out and see what happened. |
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| Sep-05-09 | | CHESSTTCAMPS: The game line allowed white to keep the bishop pair, avoid exchanges, and get more activity than the 19... Kd6 line, the best possible scenario for white. |
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Sep-06-09
 | | Once: <JLS> I remember reading some wise advice that training should be made as close as possible to a real game. So instead of trying to solve puzzles from the screen, it is (theoretically at least) better to set the pieces up on a real board. And, again ideally, your "home set" should be as close as possible in design and size as the sets that you play with in competition. Then again, wasn't it Capablanca who claimed not to own a chess set of his own? And there are several modern grandmasters who like to study a game position on the exhibition screen, because it is closer to the books and computers that they study at home... I suppose the ideal for me would be not to have an eight year old kicking me off the computer so he can play Sim City or Civilization! :-) |
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| Sep-07-09 | | LIFE Master AJ: <<johnlspouge> "Personally, I am too lazy to set up pieces, but in any case, you have no reason to be apologetic <(and I am very sympathetic about your eyes :)">> Thanks! I still see far-away stuff fine, its that close up stuff that I often have trouble with. |
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Kibitzing
sac: 18.Nh5