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   Author  Topic: How Many White Moves Before K-f4? (Chess)  (Read 1668 times)
ThudnBlunder
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How Many White Moves Before K-f4? (Chess)   How_Many_White_Moves_Till_Kf4.jpg
« on: Dec 31st, 2007, 3:13pm »		 Quote Quote Modify Modify
In the diagram below only the White king makes moves. Black does nothing.
The game ends when White plays K-f4. (At the moment K-f4 is illegal because of the Black pawn on g5.)  
How long is the shortest possible game?
« Last Edit: Dec 31st, 2007, 5:42pm by ThudnBlunder » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #1 on: Dec 31st, 2007, 7:18pm »		 Quote Quote Modify Modify
That is a long walk.

c1, a1, h8, a8, h1, h7, g5 (I hope...)
« Last Edit: Dec 31st, 2007, 10:25pm by Aryabhatta » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #2 on: Dec 31st, 2007, 7:55pm »		 Quote Quote Modify Modify
on Dec 31st, 2007, 7:18pm, Aryabhatta wrote:
That is a long walk.

c3, a1, h8, a8, h1, h7, g5 (I hope...)

That wasn't a long walk; as c3 is doubly defended, that was an illegal short-cut.
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #3 on: Dec 31st, 2007, 8:01pm »		 Quote Quote Modify Modify Remove Remove
I found 38 moves.
 
a2, a1, b2, c1, d1, e1, f2, g3, g4, f5, g6, g7, h8, g8, f8, e8, d8, c8, b8, a8, b7, c6, d5, e5, f5, g4, g3, g2,  h1, h2, h3, g4, h5, h6, h7, g6, g5, f4.
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ThudnBlunder
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #4 on: Dec 31st, 2007, 8:41pm »		 Quote Quote Modify Modify
on Dec 31st, 2007, 8:01pm, cool_joh wrote:
I found 38 moves.
 
a2, a1, b2, c1, d1, e1, f2, g3, g4, f5, g6, g7, h8, g8, f8, e8, d8, c8, b8, a8, b7, c6, d5, e5, f5, g4, g3, g2,  h1, h2, h3, g4, h5, h6, h7, g6, g5, f4.

Hmm.......a2 doesn't look very friendly either.
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #5 on: Dec 31st, 2007, 10:24pm »		 Quote Quote Modify Modify
on Dec 31st, 2007, 7:55pm, ThudanBlunder wrote:

That wasn't a long walk; as c3 is doubly defended, that was an illegal short-cut.

 
Yeah.. I mean c1. Sorry. Edited the post.
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mikedagr8
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #6 on: Jan 1st, 2008, 3:39am »		 Quote Quote Modify Modify
I get 56 moves. Undecided
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #7 on: Jan 1st, 2008, 3:41am »		 Quote Quote Modify Modify
Hmm, I am on 70.
(4.a7,17.c1,34.a1,45.h8,52.a8,61.h1,67.h7,69.g5,70.f4)
 
I like especialy Dec. 30. one, but all are nice Wink
http://www.chessbase.com/puzzle/christmas2007/index.htm
« Last Edit: Jan 1st, 2008, 3:49am by Hippo » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #8 on: Jan 1st, 2008, 11:43pm »		 Quote Quote Modify Modify
I now get 70 aswell.
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ThudnBlunder
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Re: How Many White Moves Before K-f4? (Chess)   MateInSix.jpg
« Reply #9 on: Jan 6th, 2008, 10:39pm »		 Quote Quote Modify Modify
on Jan 1st, 2008, 3:41am, Hippo wrote:
Hmm, I am on 70.
(4.a7,17.c1,34.a1,45.h8,52.a8,61.h1,67.h7,69.g5,70.f4)
I like especialy Dec. 30. one, but all are nice ;)
http://www.chessbase.com/puzzle/christmas2007/index.htm

Hmm...moving only the king, the best I can do is mate in 8:
1) Kf7+  d4
2) Kf6  dxc3
3) Ke6  Kg8 (...Kg7 is mate in 6)
4) Kd7+  Kh8 (...Kg7 is mate in 7)
5) Ke8  Kg7
6) Ke7  Kh8  
7) Kf6  c2
8) Kf7 mate.    
« Last Edit: Jan 6th, 2008, 11:05pm by ThudnBlunder » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #10 on: Jan 6th, 2008, 10:58pm »		 Quote Quote Modify Modify
FOR JANUARY 1ST
 
a) Shortest discovered mate:
1) f3  e5
2) Kf2  h5
3) Kg3  h4+
4) Kg4  d6 mate
 
b) Shortest perpetual check:
1) f4  e5  
2) Kf2  Qf6
3) Kg3 etc.
 
c) Shortest reflected mate:
1) d4  d5  
2) Qd3  Qd6
3) Qh3  Qh6
4) Qxc8  mate
OR
1) c4  c5
2) Qa4  Qa5
3) Qc6  Qc3
4) Qxc8 mate
 
« Last Edit: Jan 6th, 2008, 10:59pm by ThudnBlunder » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #11 on: Jan 6th, 2008, 11:04pm »		 Quote Quote Modify Modify
on Jan 6th, 2008, 10:39pm, ThudanBlunder wrote:

Hmm...moving only the king, the best I can do is mate in 8:
1) Kf7+  d4
2) Kf6  dxc3
3) Ke6  Kg8 (...Kg7 is mate in 6)
4) Kd7+  Kh8 (...Kg7 is mate in 7)
5) Ke8 Kg7
6) Ke7 Kh8  
7) Kf6     c2
Cool Kf7 mate.    

 
I am not sure with your 7 moves solution. (4) ... KF8. The original one is on the opposition motive. Wink
May be if you change Kd7 Ke8 order Wink
 
On the other way, I didn't solve the 1.1.2008's (I can look on link provided by you to find solution to first, ..., but I actually didn't solved it)
« Last Edit: Jan 6th, 2008, 11:10pm by Hippo » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #12 on: Jan 6th, 2008, 11:14pm »		 Quote Quote Modify Modify
on Jan 6th, 2008, 11:04pm, Hippo wrote:

 
I am not sure with your 7 moves solution. (4) ... KF8. The original one is on the opposition motive. Wink
May be if you change Kd7 Ke8 order Wink
 
On the other way, I didn't solve the 1.1.2008's (I can look on link provided by you to find solution to first, ..., but I actually didn't solved it)

Yeah, 4...Kf8 and once the Black king gets there, there is no mate.
 
I can't see one. I have been racking my brains wondering how you got it, but I see you have not found it either.
 
A few observations:
The Black king must move at least twice. (Why?)
Black cannot be allowed to play Kf8 or Kf6.
Therefore Black cannot be allowed to play Kg7 with the opposition.
 
« Last Edit: Jan 7th, 2008, 7:28am by ThudnBlunder » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #13 on: Jan 7th, 2008, 12:31am »		 Quote Quote Modify Modify
I have solved it! Smiley
Kf7 Kf8 Ke8 Ke7 Kf6 Kf7/e7/f5
 
Yes your observations are just one step to solution Wink
« Last Edit: Jan 7th, 2008, 3:20am by Hippo » IP Logged
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Re: How Many White Moves Before K-f4? (Chess)  
« Reply #14 on: Jan 14th, 2008, 2:53pm »		 Quote Quote Modify Modify
on Jan 7th, 2008, 12:31am, Hippo wrote:
I have solved it! Smiley

Dammit, I never considered the opposition-stealing Ke8.   Embarassed  Well done.
I haven't tried the others - no time at the moment.
« Last Edit: Jan 14th, 2008, 3:09pm by ThudnBlunder » IP Logged
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