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Topic: another puzzle
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haijinx

Posts: 64
Registered: Jan 20, 2019
From: Salem Oregon
Age: 48
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another puzzle
Posted: Mar 4, 2019, 1:32 PM

I have a game-based puzzle that watsu skimmed through last night...it's black to move with a forced win in 7. The first 3 moves should be enough to show the idea.






Message was edited by: haijinx at Mar 4, 2019 6:22 PM


Message was edited by: haijinx at Mar 4, 2019 6:35 PM




pente_gon

Posts: 46
Registered: Dec 26, 2017
Re: another puzzle
Posted: Mar 4, 2019, 1:48 PM

I see 2 solution in 7 moves
1. M10 (follow by J7 and M7)
2. J7 and than M7

haijinx

Posts: 64
Registered: Jan 20, 2019
From: Salem Oregon
Age: 48
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Re: another puzzle
Posted: Mar 4, 2019, 2:04 PM

Yes, thanks pente_gon. J7 is the key shortcut.

If my db detective work is right, the core of this position has been reached 29 times in the database.

Of those 29, 12 made the unnecessary extension at L6, myself included.

Only one person found J7 (me this time), most of the others used the methodical K8.

Only one person lost the initial position.

watsu

Posts: 1,099
Registered: Dec 16, 2001
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Re: another puzzle
Posted: Mar 4, 2019, 2:11 PM

If J7 without M10 first, does white prolong by forcing black to make a 4 before capturing by making a tria? ETA never mind,I see


Message was edited by: watsu at Mar 4, 2019 2:17 PM


I don't want to play non tournament rules games. If you take one of my unrated invites, play tourney
haijinx

Posts: 64
Registered: Jan 20, 2019
From: Salem Oregon
Age: 48
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Re: another puzzle
Posted: Mar 4, 2019, 2:25 PM

I think that if you go straight to J7, then if white doesn't occupy M7, you play M7 and it's done. If white plays M7, you take the pair creating the double threat that way.

Message was edited by: haijinx at Mar 4, 2019 2:34 PM


Message was edited by: haijinx at Mar 4, 2019 3:40 PM


watsu

Posts: 1,099
Registered: Dec 16, 2001
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Re: another puzzle
Posted: Mar 4, 2019, 4:51 PM

Maybe I'm blind, but so far I'm not seeing how J7 won't win in 6 moves here.
ETA: Pente_gon enlightened me - M10 + extend it out


Message was edited by: watsu at Mar 4, 2019 5:18 PM


I don't want to play non tournament rules games. If you take one of my unrated invites, play tourney
haijinx

Posts: 64
Registered: Jan 20, 2019
From: Salem Oregon
Age: 48
Home page
Re: another puzzle
Posted: Mar 4, 2019, 6:22 PM

..


Message was edited by: haijinx at Mar 4, 2019 6:35 PM


watsu

Posts: 1,099
Registered: Dec 16, 2001
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Re: another puzzle
Posted: Mar 4, 2019, 6:32 PM

No, it's still 7, but white needs to play at M10 and then extend to N10 or O10 to make it 7 moves. That's why ideal puzzles are so challenging to make, there are often different approaches which end up with the same number of moves, but only if the other side is playing to prolong the puzzle, which doesn't always happen in an actual game scenario. Good catch by pente_gon on the second line!

I don't want to play non tournament rules games. If you take one of my unrated invites, play tourney
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