wu :: forums
        (http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi)
      

        riddles >> medium >> King to f1 (Chess)
        
(Message started by: ThudanBlunder on Mar 15th, 2007, 4:52am)
Title: King to f1 (Chess)
Post by ThudanBlunder on Mar 15th, 2007, 4:52am
If the three White pawns and the Black knight are immobile, can you get the White king to the empty f1 square by making only consecutive White moves within the 3x3 square?  
Title: Re: King to f1 (Chess)
Post by Archae on Mar 15th, 2007, 5:04am
Queen takes the knight; bishop on g2 to the now empty h3; king to the open g2, then to f1 is how I would propose
Title: Re: King to f1 (Chess)
Post by ThudanBlunder on Mar 15th, 2007, 5:23am

on 03/15/07 at 05:04:54, Archae wrote:
Queen takes the knight; bishop on g2 to the now empty h3; king to the open g2, then to f1 is how I would propose

Sorry, no piece leaves the 3x3 square. I will amend the wording. Thanks.
Title: Re: King to f1 (Chess)
Post by BNC on Mar 15th, 2007, 7:18am

on 03/15/07 at 04:52:48, ThudanBlunder wrote:
If the three White pawns and the Black knight are immobile, can you get the White king to the empty f1 square by making only consecutive White moves within the 3x3 square?  


Yes, I can. I pick the white king, and place it on f1.

(You didn't say legal moves  :P )
Title: Re: King to f1 (Chess)
Post by BNC on Mar 15th, 2007, 7:24am
Seriusly now, it seems kind of simple... unless I messed up:

Bishop to f1
king to g2
bishop to h2
king to g1
bishop to g2
king to f1
Title: Re: King to f1 (Chess)
Post by SMQ on Mar 15th, 2007, 7:38am

on 03/15/07 at 07:24:39, BNC wrote:
king to g2

Not with that black knight there, you don't ;)

--SMQ
Title: Re: King to f1 (Chess)
Post by ThudanBlunder on Mar 15th, 2007, 7:39am

on 03/15/07 at 07:24:39, BNC wrote:
Seriusly now, it seems kind of simple... unless I messed up:

king to g2

But that is a seriously illegal move.
Title: Re: King to f1 (Chess)
Post by SMQ on Mar 15th, 2007, 8:08am

on 03/15/07 at 04:52:48, ThudanBlunder wrote:
can you get the White king to the empty f1 square

Yes, but it takes me 33 moves.

1. B g2-f1
2. Q h3-g2
3. K h2-h3
4. B g1-h2
5. Q g2-g1
6. B f1-g2
7. Q g1-f1
8. B h2-g1
9. R h1-h2
10. B g2-h1
11. R h2-g2
12. B g1-h2
13. R g2-g1
14. Q f1-g2
15. R g1-f1
16. B h2-g1
17. K h3-h2
18. Q g2-h3
19. B h1-g2
20. K h2-h1
21. B g1-h2
22. R f1-g1
23. B g2-f1
24. R g1-g2
25. B h2-g1
26. R g2-h2
27. Q h3-g2
28. R h2-h3
29. B g1-h2
30. K h1-g1
31. Q g2-h1
32. B f1-g2
33. K g1-f1

--SMQ
Title: Re: King to f1 (Chess)
Post by ThudanBlunder on Mar 15th, 2007, 8:21am
Well done, SMQ! (The solution I have is only 26 moves long. It first differs from yours on the 5th move.)
Title: Re: King to f1 (Chess)
Post by BNC on Mar 15th, 2007, 8:30am

on 03/15/07 at 07:38:21, SMQ wrote:
Not with that black knight there, you don't ;)

--SMQ


:-[
Title: Re: King to f1 (Chess)
Post by Ulkesh on Mar 15th, 2007, 9:15am
1. BF1
2. QG2
3. KH3
4. BH2
5. RG1
6. QH1
7. BG2
8. RF1
9. BG1
10. KH2
11. BH3
12. QG2
13. KH1
14. BH2
15. RG1
16. QF1
17. RF2
18. BF1
19. RH2
20. BG2
21. RH3
22. BH2
23. KG1
24. BH1
25. QG2
26. KF1

I'm fairly sure this is optimal, as it is necessary at some point to have certain pieces in certain positions.

(Hope there are no typos.)

Edit: I found one.
Title: Re: King to f1 (Chess)
Post by Aryabhatta on Mar 15th, 2007, 9:29am
Holy Crud!

So many moves for such a seemingly simple problem!

btw, T&B where do you get these problems from?
Title: Re: King to f1 (Chess)
Post by ThudanBlunder on Mar 15th, 2007, 9:30am

on 03/15/07 at 09:15:21, Ulkesh wrote:
15. RG1
16. QF1
17. RF2
18. BF1
19. RH2

Well done, Ulkesh! (Have I found more?)


on 03/15/07 at 09:29:57, Aryabhatta wrote:
btw, T&B where do you get these problems from?

If you mean chess problems I just come across them while surfing.
Title: Re: King to f1 (Chess)
Post by Icarus on Mar 15th, 2007, 5:20pm

on 03/15/07 at 07:39:50, ThudanBlunder wrote:
But that is a seriously illegal move.


Now, now - if the knight is immobile, it can't take the king and so the king will not be in check! ;D
Title: Re: King to f1 (Chess)
Post by rmsgrey on Mar 15th, 2007, 5:31pm
Isn't it stalemate for black since they can't move?
Title: Re: King to f1 (Chess)
Post by ThudanBlunder on Mar 15th, 2007, 5:52pm

on 03/15/07 at 17:31:38, rmsgrey wrote:
Isn't it stalemate for black since they can't move?

Bf1 is a move. In this puzzle there is no stalemate as Black doesn't move. Black merely has a knight whose sole purpose is to prevent Kg2.


on 03/15/07 at 17:20:07, Icarus wrote:
Now, now - if the knight is immobile, it can't take the king and so the king will not be in check! ;D

The threat is stronger than the execution.   :)
Emmanual Lasker
Title: Re: King to f1 (Chess)
Post by rmsgrey on Mar 16th, 2007, 12:47pm

on 03/15/07 at 17:52:49, ThudanBlunder wrote:
Bf1 is a move. In this puzzle there is no stalemate as Black doesn't move. Black merely has a knight whose sole purpose is to prevent Kg2.

I guess when I'm being tongue-in-cheek it might pay to get my tongue out of my cheek to indicate the fact :P


Powered by YaBB 1 Gold - SP 1.4!
Forum software copyright © 2000-2004 Yet another Bulletin Board