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Topic: Endgame Puzzle 2 (Read 846 times) |
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jdb
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Endgame Puzzle 2
« on: Jul 27th, 2008, 5:11pm » |
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Not too tough, but proper technique required.
1w Ra1 Dg4
1b ce2 rf8
2w pass
Link to planning window:
http://arimaa.com/arimaa/games/planGame.cgi
edit: It is silver to move.
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| « Last Edit: Jul 28th, 2008, 4:44am by jdb » |
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omar
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Re: Endgame Puzzle 2
« Reply #1 on: Jul 27th, 2008, 8:33pm » |
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If it is gold to move then just advancing the rabbit 4 steps is a win right?
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clauchau
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Re: Endgame Puzzle 2
« Reply #2 on: Jul 28th, 2008, 3:56am » |
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Excellent. Gold also threatens to remove Silver's last rabbit. Combining those threats with the need for Silver to get closer to winning, I can see at least two winning moves for Silver. One seems faster than the other but I'm not sure.
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RonWeasley
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Re: Endgame Puzzle 2
« Reply #3 on: Jul 28th, 2008, 4:51am » |
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I love these. Thanx! jdb. I found only one winning line for silver.
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omar
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Re: Endgame Puzzle 2
« Reply #4 on: Jul 28th, 2008, 10:09am » |
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Thanks for the update JDB. I should have figured it was silvers move; otherwise it's too easy 
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clauchau
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Re: Endgame Puzzle 2
« Reply #5 on: Jul 30th, 2008, 3:57am » |
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The following move doesn't look optimal but does look winning to me : 2b ce2w cd2w rf8w
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Fritzlein
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Re: Endgame Puzzle 2
« Reply #6 on: Aug 5th, 2008, 2:33pm » |
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on Jul 30th, 2008, 3:57am, clauchau wrote:| The following move doesn't look optimal but does look winning to me : 2b ce2w cd2w rf8w |
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No, I don't think that works. After 3g Dg4n Dg5n Dg6n Dg7w, Silver's options are very constrained. Using one or two steps on the rabbit will allow Gold to set up a capture in one more move. Moving the rabbit three steps west and using the fourth step on the cat still allows Gold to freeze the rabbit with capture in two, while Silver will need three moves to capture the gold rabbit. Therefore 3s re8w rd8w rc8w rb8w seems forced.
Then 4g Ra1n Ra2n Ra3n Ra4n forces Silver to play the cat to either a4 or b5, which Gold answers with D->d5. Silver's rabbit is too badly placed to race, so the best hope seems putting the gold rabbit back to a3, with the silver cat on a2 or a4. If a2, then D->b3 seems to win. If a4, then D->b4 leaves Silver with only her rabbit mobile. The silver rabbit can't get too near the gold dog without risking an immobilization loss, so maybe r->e1 looks called for. But then 7g Db4e ca4e Dc4e cb4e brings the end near.
Endgames confuse me so much that I have surely overlooked something. Please point out the hole(s) in my analysis.
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jdb
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Re: Endgame Puzzle 2
« Reply #7 on: Aug 5th, 2008, 3:58pm » |
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on Jul 30th, 2008, 3:57am, clauchau wrote:| The following move doesn't look optimal but does look winning to me : 2b ce2w cd2w rf8w |
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This move does not win, but it does take the most moves to lose. Fritz's move is the only defense to this move.
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clauchau
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Re: Endgame Puzzle 2
« Reply #8 on: Aug 6th, 2008, 3:55am » |
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Wow, thanks Fritzlein and jdb. I agree now. That's tough and interesting.
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jdb
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Re: Endgame Puzzle 2
« Reply #9 on: Aug 19th, 2008, 12:41pm » |
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THE SOLUTION IS BELOW
1w Ra1 Dg4
1b ce2 rf8
2w
2b rf8w ce2w cd2w cc2w
3w Dg4n Dg5n Dg6n Dg7w
3b re8w rd8w rc8w cb2s
4w Df7w De7s De6s De5s
4b rb8w cb1n ra8e cb2w
5w De4s
5b rb8s rb7e ca2n Ra1n
6w De3s De2w Dd2n Dd3n
6b rc7e rd7e re7e rf7e
7w Dd4e De4e Df4e
7b rg7s rg6e ca3e Ra2n
8w Dg4w Df4w De4s De3w
8b rh6s
9w Dd3s
9b rh5s rh4s rh3s rh2s
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