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Topic: Claustrophobic King (Chess) (Read 1285 times) |
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ThudnBlunder
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In the diagram below, if the knight cannot move how many legal moves does Black require to capture it with his king?
EDIT: Oh, the pawns can't move either.
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| « Last Edit: Jan 23rd, 2011, 9:57am by ThudnBlunder » |
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rmsgrey
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Re: Claustrophobic King (Chess)
« Reply #1 on: Jan 22nd, 2011, 10:18pm » |
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Assuming there's a white king moving between g8 and h8 (or otherwise staying out of the way), I'd say 5 black moves:
| hidden: | | promote f pawn, move bishop g1-e3, king goes h2-g1-f2xe1 |
I'm uncomfortable with the idea of evaluating legal moves when one side has no king and makes no moves - is it legal for black to take a second move before white takes a move? If the knight can't move, is it still illegal to move the black king to g2?
Simpler to assume the white king meanders idly without getting involved...
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ThudnBlunder
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Re: Claustrophobic King (Chess)
« Reply #2 on: Jan 22nd, 2011, 10:34pm » |
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Duh, sorry the Black pawns cannot move either.  Thanks, now corrected.
Black merely shuffles his pieces in order for his king to escape the corner.
There is no White king.
I should be more careful not to sacrifice clarity for brevity. 
It is possible I have posted this previously. 
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| « Last Edit: Jan 23rd, 2011, 9:57am by ThudnBlunder » |
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Three Hands
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Re: Claustrophobic King (Chess)
« Reply #4 on: Jan 23rd, 2011, 6:04am » |
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As the black king cannot legally move to g2 due to the threat of the knight, I make it 28 moves...
EDIT: Before I forget the sequence:
Bg2-f1, Rg3-g2, Kh2-g3, Bg1-h2, Rg2-g1, Bf1-g2, Rg1-f1, Bh2-f1, Rh1-h2, Bg2-h1, Rh2-g2, Kg3-h2, Rg2-g3, Bh1-g2, Kh2-h1, Bg1-h2, Rf1-g1, Bg2-f1, Rg3-g2, Bh2-g3, Rg2-h2, Rg1-g2, Kh1-g1, Rh2-h1, Rg2-h2, Bf1-g2, Kg1-f1, Kf1xe1
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| « Last Edit: Jan 23rd, 2011, 6:14am by Three Hands » |
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towr
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Re: Claustrophobic King (Chess)
« Reply #5 on: Jan 23rd, 2011, 6:48am » |
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Ah, yes, I forgot about that. But then, despite my father's protestations to the contrary, I'm terrible at chess.
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Wikipedia, Google, Mathworld, Integer sequence DB
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