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May-17-12
 | | M.Hassan: "Medium" White to play 48.?
48.g6 hxg6
49.hxg6 Kf6
50.g7 Kxg7
51.Kxe5
Now, white king is closer to a file and can capture Black pawn and promote his own a4 pawn <if48.g6 Kf6 49.gxh7 Kg7 50.h8=Q+ Kxh8
51.Kxe5
Black King will have heavier job to do.Capturing h pawn and get close to a file. Obviously can not do it.> Time to check |
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May-17-12
 | | Infohunter: <Phony Benoni: I see the question today is not so much whether 48.h6 is the right move, but whether it actually wins or not. I haven't the time to investigate it at the moment, but don't take the win for granted.> The win is as follows: After 48.h6 Black must play 48...Kf7 (48...Kd6 49.g6 hxg6 50.h7). After 49.Kxe5 Kg6 50.Kf4 Kf7 (50...Kh5? 51.Kf5 Kh4 52.g6 etc.) 51.Kf5 Kg8 52.Ke6 Kf8 53.Kd5 Kf7 54.Kc5 Kg6 55.Kb5 Kxg5 56.Kxa5 Kxh6 57.Kb6 Kg5 58.a5 and wins. White must make Black spend his time mopping up his Kingside Pawns without being able (A) to make it to the Queenside for a Rook Pawn draw or (B) queen his own Pawn first. Hence White must not attempt to take Black's h-Pawn, lest the win slip. |
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May-17-12
 | | whiteshark: <48. h6> and that's it. (Zugzwang. 48...Kf7 49.Kxe5 Kg6 50.Kf4 and there is no opposition.) |
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May-17-12
 | | Tiggler: 48.h6 wins. Zugswang. 48... Kf7, otherwise the h-pawn will queen.
49.Kxe5 Kg6
50.Kf4 Kf7
51.Kf5 Kg8
52.Kf6 Kf8
53.Ke6! Ke8
54.Kf6 and the white king reaches the a-file in time to capture the a5 pawn and get to b7 before the black king can reach b8 or c7, because the black king cannot follow before capturing the g-pawn. It's not even close. If white plays g6 any time, black may draw. |
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| May-17-12 | | newzild: Wow, so much analysis by so many people. I went with 48. h6 instantly, as it is clear at a glance that 48. g6 does not win and that any moves by White's king allow Black's king to infiltrate. |
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May-17-12
 | | goldfarbdj: <M. Hassan>: In your first line, white can win the pawn on a5, but not the game. There are two different ways for black to draw, even: put his own king on a8, where it can't be driven away because it's on the edge of the board, it can only be stalemated; and (cuter) put his king on c5, where it traps the white king so that he can't get out of the way of his pawn. |
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May-17-12
| | Tiggler: <al wazir> and <M.Hassan> and <whiteshark>
Black can draw after all the lines you give if 48.g6 or 49.g6 or anytime g6, because that helps black to capture the king's-side pawns in time to reach a8 or get to c7 with white king stuck on the a-file. |
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May-17-12
 | | Abdel Irada: Counter that intuition: The "obvious" 48. g6 leads only to a draw at best, so white must prefer 48. h6, when black must either give up the e-pawn or permit white's h-pawn to queen. After the forced 48. ... f7; 49. xe5, g6; 50. f4, black has no alternative to 50. ...f7, and white wins with a modicum of caution as follows: 51. f5, g8; 52. e6, f8; 53. d6, f7 (not 53. ...e8?; 54. g6, hxg6; 55. h7  ); 54. c6, g6; 55. b6, xg5; 56. xa5, xh6; 57. b6, g5; 58. a5, h5; 59. a6, h4; 60. a7, h3; 61. a8= , g4; 62. h1 . |
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| May-17-12 | | dumbgai: Not hard for a Thursday. I thought 48. h6 was pretty obvious, especially since the alternative g6 is a pretty clear draw. |
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| May-17-12 | | VincentL: "Medium".
For a few seconds I thought 48. g6 might win, but after K side pawn captures
the black king can get over to the Q side to stop the a pawn queening. So 48. h6!
Now black must move his king back, allowing 49. Kxe5. 48.....Kf7 offers most resistance. Then 49. Kxe5 Kg6. 50. Kf4.
Now if 50.....Kh6 51. Kf5 Kh4 52. g6 and white queens one of the K side
pawns.
If 50.....Kf7 51. Kf5 Ke7 52. g6 hxg6 53. Kxg6 Kf8 54. h7 and the pawn
queens.
Finally if 48.....Ke7/Kd7 49. Kxe5 followed by Kf5. Now white´s king
can move over to the queen side and capture black´s pawn on a5. If
black moves his king over to stop white´s a pawn queening, white
simply plays g6 at an appropriate moment, and either his g or h pawn
will queen.
Let´s check. |
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May-17-12
 | | agb2002: The material is equal.
White can win the pawn on e5 with 48.h6:
A) 48... Kd6(d7,e7) 49.g6 hxg6 (if the king moves then 50.gxh7 wins) 50.h7 wins. B) 48... Kf7 49.Kxe5
B.1) 49... Kg6 50.Kf4 Kf7 (50... Kh5 51.Kf5 Kh4 52.g6 wins) 51.Kf5 B.1.a) 51... Ke7(8) 52.g6 hxg6+ 53.Kxg6 Kf8 54.h7, etc. B.1.b) 51... Kf8 52.Kf6 Kg8 (52... Ke8 53.g6) 53.Ke7 Kh8 54.Kd6 and promotes the a-pawn. B.1.c) 51... Kg8 52.Ke6 Kf8 53.Kf6 transposes to B.1.b. B.2) 49... Ke7(8) 50.g6 hxg6 51.h7, etc.
B.3) 49... Kf8(g8) 50.Kf6(e6) transposes to B.1.b. |
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| May-17-12 | | UnsoundHero: White seems to have plenty of tempi to spare. Take this position: White Ke4; Pa2,g5,h5. Black: Ke6; Pa3,e5,h7.
The line would go 1 h6 Kf7 2 Kxe5 Kg6 3 Kf4 Kf7 4 Kf5 Kg8 5 Ke6! Kf8 6 Kf6 Kg8 7 Ke7 Kh8 8 Kd6 Kg8 9 Kc5 Kf7 10 Kb4 Kg6 11 Kxa3 Kxg5 12 Kb4 Kxh6 13 a4 Kg5 14 a5 h5 15 a6 h4 16 a7 h3 17 a8(Q). |
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| May-17-12 | | fetonzio: i don´t like this as a problem because white´s move is almost forced. |
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| May-17-12 | | thegoldenband: This problem is a very good exercise in winning tempi, even though it doesn't really affect the final outcome. If your analysis ends up in a position where White wins the pawn race by only one move, you haven't maximized your opportunities! |
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May-17-12
 | | sevenseaman: What serendipity! What a coincidence!
Half an hour before today's <CG> home page arrived I was leisurely doing this problem. 
click for larger viewWhite to play and win.
First time around I did it in 10-12 moves (may be more), even promoting a P. It occurred to me perhaps it could be done faster. Second time around I did it in 6 moves.
Imposed 5 forcing moves on the Black K and mated him on the 6th. I couldn't improve upon that. See if you can do it in 6 (or less). Guaranteed enjoyment, unless you dig up Nalimov help. |
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| May-17-12 | | LIFE Master AJ: Looks too simple, 48.h6, and Black is lost. (Am I missing something here?) |
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| May-17-12 | | SimonWebbsTiger: @<sevenseaman>
not just you then because I've been reviewing Dvoretsky's Endgame Manual (the chapter on pawn endgames) this week. Needless to say, today's problem was just too easy after a bit of Dvoretsky! |
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| May-17-12 | | LIFE Master AJ:
click for larger viewWhite to move.
1.Bd8!! Kxe4; 2.Kd6+! Kf5; 3.Rg8 Ke4; 4.Rg3 Kf5; 5.Rg5+ Ke4; 6.Re5#. 1-0 Long time on this one, I eventually had to set it up on a real board. (I cheated, I also moved the pieces.) |
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May-17-12
| | sevenseaman: <LMAJ> You are on the money. Doing it on the board lends more clarity, I do not think it should be termed 'cheating'. Its only because we are all the time trying to recreate OTB ambiance that we usually shy away from using the board. If you need the prop it will not be a realistic training. <SimonWebbsTiger> Totally agree. It puts one in the mood, or call it in a frame of greater awareness. The moment I looked at today's POTD <48. h6> was like a pot shot. No doubts whatsoever. |
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| May-17-12 | | gambler: this is rather easy. you don't want the opponent king to get near your pawns. simple endgame logic. h6 and zugzwang will do. any other move will probably lose. Once the black king moves to d6, you move to f5 and promotion is inevitable due to the position of the white king and superior pawn structure on the king side. If black chooses to play any other move, white will capture the pawn and be up in material. |
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| May-17-12 | | dragon player: The most logical move doesn't work:
48.g6 hxg6
49.hxg6 Kf6
50.Kd5 Kxg6
51.Kxe5 Kg5
and black will be in time.
But this works:
48.h6 Kd6
If 48...Kf7 49.Kxe5 Kg6 50.Kf4 and white has an extra
pawn.
49.g6! hxg6 (What else?)
50.h7
and white gets a queen.
If I remember well, there was a Capablanca-game with
the same pattern. Lets find it.
I found it, but it's not on chessgames.com, but it is here:
http://www.365chess.com/game.php?gi...
Time to check.
------------
Right indeed.
4/4 |
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| May-17-12 | | SimonWebbsTiger: apropos Dvoretsky's Endgame Manual, he (re)formulated a very helpful rule about positions with rook pawns and an extra passed pawn on the other side of the board in pawn endgames. Worth learning. |
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May-17-12
 | | OhioChessFan: Intuitively easy, and you can just count if that doesn't work. |
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May-17-12
 | | Memethecat: Not as easy as it first looked.
Intuitively I went for 48h6, but after doing the sums I realised in a straight dash black queens in 10 moves, but white needs 11. So it must be 48g6, but nope, the black K is 1 square behind & can easily reach the party pooper/stalemate squares a8 & b8. Back to my intuitive 48h6, but how to squeeze out a tempi or 2?, easy now we know they're needed. 48h6 Kf7 49Kxe5 Kg6 50Kf4 Kf7 51Kf5 If black goes to 8th rank there's enough time to run across the board. If 51...Ke7 52g6 queens K side. I wouldn't fancy this in time trouble, but I did learn in a position like this you can count your moves separately, instead of W moves there, B moves there etc. I could just count how many W moves it would take from h6 to a8=Q (11), then do the same for B (10), quite useful/fast when the 'box' doesn't apply. Does everybody else already know this little trick?. |
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May-17-12
 | | awfulhangover: I thought 48.h6 was so obvious that I was looking for why it was wrong :-) |
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