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Topic: White to Play and Win (II) (Read 535 times) |
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ThudnBlunder
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White to Play and Win (II)
« on: May 6th, 2003, 9:28pm » |
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WHITE:
King at c8
Bishop at d8
Pawn at b7
BLACK:
King at c6
Bishop at h2
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wowbagger
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Re: White to Play and Win (II)
« Reply #1 on: May 7th, 2003, 1:44am » |
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This is theoretically won, as the shorter diagonal from the promotion square is three squares or less. At least, that's what I think the limit is.
You have to prevent Black's bishop from controlling b8, of course. I'll have to seriously think this over sometime. 
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wowbagger
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Re: White to Play and Win (II)
« Reply #2 on: May 7th, 2003, 4:07am » |
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Ok, how about this:
1. Ba5 Bg3
2. Be1! Bh2
3. Bf2 Bf4
4. Ba7 Bh2
5. Bb8 Bg1
6. Bg3 Ba7
7. Bf2!
If Black moves his bishop to f4 or e5 instead of to g3 on his first move, White will move correspondingly (d2, c3).
Note that moving the Black bishop to c7 doesn't help.
The only remaining possibility for Black is therefore
1. ... Bd6
which is met by
2. Bb4 Bh2 (2. ... Bc7, 3. Bc5)
3. Ba5!
In the position at the beginning, it is vital to keep the Black King away from the square a6. From there he would control a7 and thus prevent the manoeuvre allowing White to gain control of b8.
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| « Last Edit: May 7th, 2003, 4:13am by wowbagger » |
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ThudnBlunder
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Re: White to Play and Win (II)
« Reply #3 on: May 7th, 2003, 9:57am » |
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Quote:| In the position at the beginning, it is vital to keep the Black King away from the square a6. |
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The winning method does not involve this idea. In fact, White cannot prevent Kc6 - b5 - a6.
But Black must defend against TWO threatened manouevres which allow White to promote.
Yeah, it's true that 2. Be1 wins quickly.
However, Black needn't present his Bishop as an easy target on g3, after which White can control the
important g1-a7 diagonal.
Instead, 1....Bd6 denies White an entry point to the diagonal.
By the way, it's a pity there's no way of inserting a proper board.
Another puzzle site that I know of allows the display of positions using the syntax [Chess] FEN position [/Chess].
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| « Last Edit: May 7th, 2003, 8:06pm by ThudnBlunder » |
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wowbagger
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Re: White to Play and Win (II)
« Reply #4 on: May 8th, 2003, 2:40am » |
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on May 7th, 2003, 9:57am, THUDandBLUNDER wrote:
Yeah, it's true that 2. Be1 wins quickly.
However, Black needn't present his Bishop as an easy target on g3, after which White can control the
important g1-a7 diagonal.
Instead, 1....Bd6 denies White an entry point to the diagonal. |
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I had this possibility in mind, as you can read in my previous post.
However, it doesn't work as it's only leading to the point of departure. 
Looks like this one requires even more thinking...
Quote:| By the way, it's a pity there's no way of inserting a proper board. |
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Quite right.
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