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Feb-27-10
 | | SuperPatzer77: <agb2002> <...A.1.a) 53.Kb7 g2 54.a6 g1=Q 55.a7 Qg2+ 56.Kb8 (56.Kb6 Qa8 or Qf2+ with the same idea as that of the main line) Qg3+ 57.Kb7 Qf3+ 58.Kb8 Qf4+ 59.Kb7 Qb4+ 60.Ka8 (60.Kc6(7,8) Qxc3+) Qxc3 - +....> <gofer> and <agb2002> My question is what's Black's best move after 59...Qb4+, 60. Ka6!? (instead of 60. Ka8 and Kc7 (6 or 8))??? I mean 60. Ka6!? - now what's Black's best move? The queen check by White sure annoys Black big time. 60. Ka6 b1=Q, 61. Nxb1 Qxb1, 62. a8=Q+ - No way Black can win. So, my winning line is 55...b1=Q+! instead of 55...Qg2+. It sure gives Black simplification and Black will eventually mate. SuperPatzer77 |
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Feb-27-10
 | | johnlspouge: Saturday (Very Difficult)
Glek vs Hector, 1995 (44...?) Black to play and win.
Material: Up R+P for N. White has an advanced Pd6 squeezing the Black Ke8, which has 1 legal move. White threatens 45.d7+ Kf8 46.d8=Q+. Black’s immediate object is to avoid sacrificing Rd1 for Pd6. Candidates (44...): Rc1+
I went for 44…Rc1+, missing the White defense 45.Nc6. |
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| Feb-27-10 | | BOSTER: The most attractive move is f6,creating the "queening" pawn on the King's side.
After 44...f6 45.Nxg6 fxg5 or 45...gxf6
black have two pawns to advance fighting against white Knight.
Certainly white Knight even with great imagination can not jump from b file to g (or f) in one move. |
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Feb-27-10
 | | al wazir: <OCF>: Thanks. I can't fault myself too severely for not finding that line. The analysis is nontrivial, even in the position you show after 50. Nd3. |
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Feb-27-10
 | | Jimfromprovidence: What a difference one tempo makes.
In the winning version 44…b4 45.d7+ Rxd7+ 46.Nxd7 b3 47.Nf6+ Kf8 48.Ne4 b2 49.Nc3 f5 we get the diagram below.
click for larger viewBut if we try 49...f6 instead, it's a draw!
click for larger viewWhite gains the tempo he needs to play 50 Kb6 (not the losing 50 gxf6). Now he can capture white’s a pawn and promote his own a pawn, just after black promotes his g pawn. |
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Feb-27-10
 | | David2009: Saturday 27/02/2010 endgame Glek vs Hector, 1995 Black 44? We push the Pawn: 44...b4 45 e7+ Rxe7+ 46 Nxe7 f5! 47 gxf6 Kf7! and one of the two passed Pawns queens.
Check how the game went and set it up on Crafty colours
reversed:
======
I got the first move but not the continuation: 46...f5 turns out to be a bad mistake. Glek suggests 44...b4! 45.d7+ Rxd7+! 46.Nxd7 b3 47.Nf6+ and now A) 47...Ke7? 48.Ne4! b2 49.Nc3 f5 50.gxf6+ Kxf6 51. Kb6 g5 52. Kxa6 g4 53. Kb5 g3 54.a6= B) 47...Kf8!! 48.Ne4 b2 49.Nd2 f5! 50.gxf6 (not with check this time!) ...g5! and wins. I now think my line is at best a draw, Crafty lets me off with a QN v QP ending but might have stronger. I had missed the speed of White's counter-attack.
http://www.chessvideos.tv/endgame-t...
(Crafty on-line link colours reversed). Enjoy winning the game using Glek's solution and try out mine. |
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Feb-27-10
 | | agb2002: <SuperPatzer77: <agb2002> <...A.1.a) 53.Kb7 g2 54.a6 g1=Q 55.a7 Qg2+ 56.Kb8 (56.Kb6 Qa8 or Qf2+ with the same idea as that of the main line) Qg3+ 57.Kb7 Qf3+ 58.Kb8 Qf4+ 59.Kb7 Qb4+ 60.Ka8 (60.Kc6(7,8) Qxc3+) Qxc3 - +....> <gofer> and <agb2002> My question is what's Black's best move after 59...Qb4+, 60. Ka6!? (instead of 60. Ka8 and Kc7 (6 or 8))??? I mean 60. Ka6!? - now what's Black's best move? The queen check by White sure annoys Black big time. 60. Ka6 b1=Q, 61. Nxb1 Qxb1, 62. a8=Q+ - No way Black can win.> I missed 60.Ka6 but I think that 60... Qc4+ 61.Kb7 (61.Kb6 Qc8) Qf7+ 62.Ka(b)6 (62.Kb8 Qb3+ followed by 63... Qxc3) Qxf6+ 63.Kb7 (else 63... Qf3) Qf7+ 64.Ka(b)6 Qf3 followed by Qa8 wins. <So, my winning line is 55...b1=Q+! instead of 55...Qg2+. It sure gives Black simplification and Black will eventually mate.> 55... b1=Q+ 56.Nxb1 Qxb1+ 57.Kc8 and draws because the black king is far from a8. Compare with (White to move) 
click for larger viewfrom Averbakh's "Chess Endings. Essential knowledge", page 25. |
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Feb-27-10
 | | Marmot PFL: Went with 44...b4 45 d7+ Rxd7 46 Nxd7 b3 47 Nf6+ Kf8 (not wanting to allow knight checks) 48 Ne4 b2 49 Nd2 f5 50 gf g5 and it seems black will queen before white can take and queen the a pawn. at any rate alternatives don't look so clear, 44 ...f5 45 gf and white has 2 passed pawns or 44...Rc1+ 45 Nc6 Rxc6+ 46 Kxc6 Kd8 47 Kd5 or Kc5 and I am not sure about this pawn ending. |
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Feb-27-10
| | agb2002: <SuperPatzer77> Sorry, I forgot the white pawn on f6 in your line 55... b1=Q+. That makes a big difference! |
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Feb-27-10
| | SuperPatzer77: <agb2002> <That makes a big difference> Hee Hee Hee. You're absolutely right, <agb2002>. My winning line sure gives Black simplification. Well, simplification is much better than difficulty. I assume that almost every grandmaster really prefers simplification over difficulty. Thanks, <agb2002>! Have a good weekend, dude! SuperPatzer77 |
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| Feb-27-10 | | WhiteRook48: i considered b4, but tried rxd6 instead |
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| Feb-27-10 | | wals: 44. Ne5 b4 45.
d7+ 45. Nc4 Rd4 39} 46.  b2 b3 47.  b7  xd6 48. a4
f6 49. c7 d4 50. b2 d2 51. gxf6 xb2 52. b7
c2 53. Kb8 b2 54. f7+ Kxf7 55. Ka7 b1=Q 56.
Ka8 Rc8+ 57. Ka7 Qb8+ 58. Kxa6 Rc6#
Courtesy of Rybka 3 1-cpu: 3071mb hash: depth 15: time 30min: |
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Feb-27-10
 | | chrisowen: I've got a hunch Igor will draw this. To my horror Hector might have it won. Omen is, best peck off pawns after pushing. Why not b4! it
was no con dominating worthy gamble in the middle. Ages the great king will take over a6 to seize her. Paganus play frees white, looks
circumspect now yet a half point's poetic justice for the promotion ill he had. |
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Feb-27-10
 | | scormus: couldn't resist another look using the hotel room's WiFi. I might have guessed the simple b-pawn dash wouldn't work on it's own. looks like <gopher> got it with the 47 .... Kf8 line and f49 .. f5. I think B wins whether W takes e.p. or not. With W's p on a7, B queens then gains tempi by +ing WK. B wins if he can get Qb4 either with + or with BK on a8. But aesthetically I prefer gopher's position with 3Q on the board. The fight fans love that sort of thing too. |
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Feb-27-10
| | David2009: <OhioChessFan: <aw: What's wrong with 44...f5 ? I don't see how white can stop both passed pawns>
44...f5 45. gxf6 b4 46. d7+ Rxd7 47. Nxd7 b3 48. Kd6 Kf7 49. Ne5+ Kxf6 50. Nd3>
click for larger view
This is an interesting variation. Both sides now have to play accurately to draw:
50...g5 51.Kd5 g4 (Black has nothing better: attempting to shut the White K out with 51...Kf5? rebounds since the WK then rounds up the b Pawn) 52.Kd4! g3 53.Ke3 Kg5 54.Kf3 Kh4 55.Kg2 Kg4 56.Nb2 Kf4 57.Nc4
click for larger view
and Black cannot approach the b Pawn so the game is drawn. |
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Feb-27-10
| | David2009: <nuwanda: [snip] its a useful thing to have in your repertoire that the queen alone wins against a rim-pawn on the seventh rank assisted by his king (here a7, Kb7) provided that the side with the pawn has at least one move left anywhere else (here f7)> You are absolutely right! I rever realised this until now. This is why there's no stalemate to spoil <SuperPatzer77>'s winning line. |
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Feb-27-10
| | SuperPatzer77: <David2009> <...You are absolutely right! I rever realised this until now. This is why there's no stalemate to spoil <SuperPatzer77>'s winning line> Right on, <David2009>!!! Have a nice weekend, dude!!
My name is Dave or David, by the way. :-)
SuperPatzer77 |
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| Feb-27-10 | | reti: I believe there is a study similar to this position. |
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Feb-27-10
 | | OhioChessFan: <reti: I believe there is a study similar to this position. > Yes, I almost referenced your namesake's famous endgame study in regards to the 44...f5 line. <David2009> went ahead and showed the rest of that line where each Pawn move down the f file is echoed by the King to the same rank. d4 is the magic square in all that, whence the King can move down the d4/g1 diagonal. |
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| Feb-27-10 | | dufferps: Hmm, I thought 44 ... Rc1+ was a winning move for black, but, after white's Nc6, everything I tried for black ended in a draw. I truly think only a blunder could give either side a win after that point in the game. Black has an extra pawn, but they are too far back to promote, especially since the King must prevent white's advance pawns from promoting first. After exchanging pawns at b4 and c3, black needs 7 moves to promote at f1 or g1 on a straight run; white needs only 6 moves to promote at a8, so black must defend and evenually draw. Alternative skirmishes are possible: (e.g, Black pawn runs for g1 - White king has just enough time to be at f2 to capture him - then has enough moves to prevent an a1 promotion - with no pawns left, White can force a stalemate or take black's remaining pawn). In the end, the basic positions force black to play carefully for the draw. |
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| Feb-27-10 | | zooter: 44...b4 wins? Later just sac the rook for the pawn if it reaches d7...and the knight is too far away to catch the b pawn time to check |
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| Feb-27-10 | | zooter: well, my idea was correct, but off course there is a deep line that needs to be found before claiming the point for this |
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Feb-28-10
 | | patzer2: For the Saturday Feb 27, 2010 puzle solution, Black initiates a winning passed pawn combination with 44... b4!! (a move missed in the acgtual game) 45. d7+ Rxd7+ 46. Nxd7 b3 47. Nf6+ Kf8! 48. Ne4 b2 49. Nd2 f5 50. Kb6 f4! when Black's pair of passers win the promotion race after 51. Kxa6 f3 52. Kb6 f2 53. Kc5 b1=Q 54. Nxb1 f1=Q  .P.S. At lower search levels my Fritz 10 program shows 44...Rc1+?= to be decisive, but as it approaches 18 ply it indicates 44...b4! is the winning move. |
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| Sep-04-10 | | LIFE Master AJ: 44...b4!! was a TOUGH move to find all the way to the end. Not even the might Fritz sees it right away. |
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| Sep-04-10 | | LIFE Master AJ: should have been "the mighty Fritz" ... ... ... |
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