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Topic: Endgame Puzzle 7 (Read 2857 times) |
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jdb
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Endgame Puzzle 7
« on: Apr 5th, 2011, 8:45am » |
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Silver to play and win
1w Db1 Ra2 Ca5
1b da1 ra3
2w pass
http://arimaa.com/arimaa/games/planGame.cgi
Hint: There are only two choices for the first move, one works the other does not.
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Fritzlein
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Re: Endgame Puzzle 7
« Reply #1 on: Apr 5th, 2011, 11:23am » |
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My first thought is that I have no idea. I tried a few lines and find it much less obvious than Puzzle 6. On the other hand, it is so much fun to hide text with the background color, I simply can't resist! It makes me feel all special, like I have a big secret to whisper. But maybe nobody will fall for this trap. 
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| « Last Edit: Apr 5th, 2011, 11:24am by Fritzlein » |
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chessandgo
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Re: Endgame Puzzle 7
« Reply #2 on: Apr 5th, 2011, 1:40pm » |
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Haha! I've fallen for it.
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| « Last Edit: Apr 5th, 2011, 1:40pm by chessandgo » |
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chessandgo
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Re: Endgame Puzzle 7
« Reply #3 on: Apr 5th, 2011, 1:43pm » |
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Great, post count +1. So I've got:
2s Ra2ee da1ne 3g Db1w Ca5ess 3s Rc2e db2e, and I think silver wins by pushing Gold's Rabbit to e3 on the next move. When I started to look at the position I went "wow, no way!". Rabbit advancement, rabbit advancement
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mistre
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Re: Endgame Puzzle 7
« Reply #4 on: Apr 5th, 2011, 3:03pm » |
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I think I might have it! See below for my guess.
2s Ra2e da1n Rb2e da2e
3g Ca5s Ca4e Cb4s Db1w
3s Rc2e db2e
4g Da1n Cb3n Cb4e
4s Rd2n dc2e Rd3e dd2n
5g ra3e Da2n rb3n Da3e
5s Re3e Rf3x dd3e
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| « Last Edit: Apr 5th, 2011, 3:05pm by mistre » |
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jdb
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Re: Endgame Puzzle 7
« Reply #5 on: Apr 5th, 2011, 3:52pm » |
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This puzzle is much more difficult than I intended.
Both attempts so far need to address the subtle
4g Da1e Db1n !!!
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robinz
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Re: Endgame Puzzle 7
« Reply #6 on: Apr 5th, 2011, 4:05pm » |
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I had a different move for 3s - I flip the cat to B1 instead. Is this any good? (I haven't found a refutation yet, but I wouldn't swear there isn't one - as you say, this is a tougher position than it looks!)
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| « Last Edit: Apr 5th, 2011, 4:06pm by robinz » |
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Eltripas
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Re: Endgame Puzzle 7
« Reply #7 on: Apr 5th, 2011, 9:00pm » |
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on Apr 5th, 2011, 4:05pm, robinz wrote:| I had a different move for 3s - I flip the cat to B1 instead. Is this any good? (I haven't found a refutation yet, but I wouldn't swear there isn't one - as you say, this is a tougher position than it looks!) |
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What's whit the people putting their answers in that color?
Edit: mmm the problem seems to be that you put a space after color= (color= #AFC6DB), that causes some browsers to put that text in a very visible green color, if you don't put the space it works fine (color=#AFC6DB).
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| « Last Edit: Apr 6th, 2011, 7:45am by Eltripas » |
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Hippo
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Re: Endgame Puzzle 7
« Reply #8 on: Apr 6th, 2011, 3:52am » |
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on Apr 5th, 2011, 9:00pm, Eltripas wrote:
What's whit the people putting their answers in that color?
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It's almost invisible in some browsers, but clearly visible in others ... please use exact colors mentioned in separete thread.
BTW: I have not found a way to unhide on experia, yet ... expect start quotting ...
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ginrunner
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Re: Endgame Puzzle 7
« Reply #9 on: Apr 6th, 2011, 1:43pm » |
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easily the hardest one yet ... I just now finally got it
moves?Ra2e da1n Rb2n Da2e
Db1w Ca5e Cb5e Cc5s
Rb3n db2n Rb4n db3n
Da1n
Rb5n db4n Rb6e Rc6x db5n
edit: if the cat moves differently then there is a completely different line that I just found where gold is again forced to make certain moves but puzzles like this can go in a few different direction.
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| « Last Edit: Apr 6th, 2011, 1:57pm by ginrunner » |
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mistre
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Re: Endgame Puzzle 7
« Reply #10 on: Apr 6th, 2011, 3:59pm » |
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Ginrunner,
Doesn't 3g Ca5s Ca4e ra3n Rb3w kill your plan?
Don't get me wrong - you still might have the right 2s. This one is so complicated!
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ginrunner
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Re: Endgame Puzzle 7
« Reply #11 on: Apr 6th, 2011, 4:57pm » |
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that was the different line I said in my edit. i still think it wins ... let me refind the line in that case.
edit: yes every line I have so far leads to a win due to two things but there are so many different paths from there that I could be wrong (I don't think I am). more:That cat move eventually leads to Ra3 Db3 ra4 dc5. Then the advanced rabbit has a major advantage from the 2 decent moves gold can do after that. Gold can not make a threat without opening up a threat but again this line is fuzzier.
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| « Last Edit: Apr 6th, 2011, 5:07pm by ginrunner » |
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mistre
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Re: Endgame Puzzle 7
« Reply #12 on: Apr 6th, 2011, 7:30pm » |
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But if there is only one solution - doesn't it require there to be only one winning line?
JDB, can you please verify?
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jdb
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Re: Endgame Puzzle 7
« Reply #13 on: Apr 6th, 2011, 8:11pm » |
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on Apr 6th, 2011, 7:30pm, mistre wrote:But if there is only one solution - doesn't it require there to be only one winning line?
JDB, can you please verify? |
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Since this puzzle is difficult, I'll give some clarification.
If gold plays the longest defence, silver wins on 9b.
On silver's first and second turn, there is only one winning move.
On gold's first turn, there is only one move that is a strong defense.
After that there are more possibilities.
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mistre
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Re: Endgame Puzzle 7
« Reply #14 on: Apr 6th, 2011, 9:39pm » |
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So in order to solve - we need to find the line that silver wins on 9b?
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