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        Arimaa >> General Discussion >> Endgame Puzzle 1
        
(Message started by: jdb on Mar 28^th, 2011, 9:19am)

Title: Endgame Puzzle 1
Post by jdb on Mar 28^th, 2011, 9:19am

Black to play and win.

1w Rc1 Cf1
1b rf7 rg8
2w pass

Cut and paste the position into the planning application:
http://arimaa.com/arimaa/games/planGame.cgi

Added to arimaa puzzle collection:
http://arimaa.com/arimaa/puzzles/show.cgi?p=p59

Title: Re: Endgame Puzzle 1
Post by rbarreira on Mar 28^th, 2011, 9:45am

Wow...

(sent you a PM)

Title: Re: Endgame Puzzle 1
Post by mistre on Mar 28^th, 2011, 10:55am

I got it - are we posting the solution here?

Title: Re: Endgame Puzzle 1
Post by rbarreira on Mar 28^th, 2011, 11:01am

I think it would be better to post any solutions offsite (for example at pastebin) and link to them here.

Here is what I think is the solution (briareus's analysis):

http://pastebin.com/hXe4Pd2K

Title: Re: Endgame Puzzle 1
Post by Fritzlein on Mar 28^th, 2011, 11:02am

I thought I got it, but then I found a defense. Please don't post the solution here. May I recommend posting it as a puzzle using the puzzle tool that Omar created? That allows the answer to be hidden from those who don't want to know, but available to those who want to verify their solution.

Title: Re: Endgame Puzzle 1
Post by lightvector on Mar 28^th, 2011, 12:36pm

Sharp agrees with briareus.

http://pastebin.com/9w4GD6zN

Title: Re: Endgame Puzzle 1
Post by chessandgo on Mar 29^th, 2011, 11:05am

nice :) [having read sharp's solution obv ^^] I like the thread title, we're going to get more cute endgame problems it seems.

Title: Re: Endgame Puzzle 1
Post by mistre on Mar 29^th, 2011, 1:32pm

Hmmm... that's not what I got. Isn't reversing Silver's first two moves a faster way to win? Or am I missing something obvious?

Title: Re: Endgame Puzzle 1
Post by jdb on Mar 29^th, 2011, 3:30pm

on 03/29/11 at 13:32:29, mistre wrote:

Hmmm... that's not what I got. Isn't reversing Silver's first two moves a faster way to win? Or am I missing something obvious?

All of these puzzles will have only one winning move.

Title: Re: Endgame Puzzle 1
Post by lightvector on Mar 29^th, 2011, 5:13pm

Spoiler for mistre:

http://pastebin.com/cSNgfjr0

Title: Re: Endgame Puzzle 1
Post by mistre on Mar 29^th, 2011, 10:27pm

on 03/29/11 at 17:13:33, lightvector wrote:

Spoiler for mistre:

http://pastebin.com/cSNgfjr0

Ok, I get it now. I didn't see that 3g. The other 3g I was looking at was a goal for Silver in 4.

Title: Re: Endgame Puzzle 1
Post by Eltripas on Mar 30^th, 2011, 12:22am

on 03/29/11 at 13:32:29, mistre wrote:

Hmmm... that's not what I got. Isn't reversing Silver's first two moves a faster way to win? Or am I missing something obvious?

What do you mean by "reversing"?

Title: Re: Endgame Puzzle 1
Post by mistre on Mar 30^th, 2011, 7:17am

on 03/30/11 at 00:22:14, Eltripas wrote:

What do you mean by "reversing"?

What I meant was that if silver played its first two moves in reverse order (the same two moves), then it would have a quicker goal. But I had the wrong 3g response from Gold for that to work.

Title: Re: Endgame Puzzle 1
Post by Fritzlein on Mar 30^th, 2011, 2:38pm

Thanks, jdb, for a nice puzzle. I finally got around to solving it. Thanks all for holding off on posting the solution. It is trickier than it appears; the solution is critically affected by the presence of the traps squares. It is easy for me to forget that trap ownership is irrelevant; indeed it is Gold's home trap that prevents him from properly defending the winning move.

To clarify for anyone who might be confused by mistre's posts: at first I also thought his move would win, but it loses (as opposed to winning more slowly than the true solution, as one might infer from his posts.)

Title: Re: Endgame Puzzle 1
Post by Fritzlein on Mar 31^st, 2011, 9:38am

Wow, 4s is like a second key move. I totally didn't see that further trickeration would be necessary to bring home the win. Thanks, jdb, for adding the puzzle to the collection, along with the entire solution!