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| How do you find XY-Chains? http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=10&t=856 |
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| Author: | leo [ Thu Dec 23, 2010 11:46 am ] |
| Post subject: | How do you find XY-Chains? |
Is there any trick to easily find XY-chains? To me, it seems like guessing and trying. With some effort, I can find XY-wings (which are the shortest possible XY-chains) without problems but I hardly find longer chains. Thanks for your help in advance, leo |
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| Author: | Ed [ Thu Dec 23, 2010 8:29 pm ] |
| Post subject: | Re: How do you find XY-Chains? |
Welcome leo! I was sure we already had a "leo" here, but guess not. Perhaps I've been lurking on you somewhere else.  leo wrote: Is there any trick to easily find XY-chains? Børge has what looks like a really nice post about that here. I like the way he starts by asking the pragmatic, "gee, it would be good to get rid of that candidate x from that spot, hmm, lets see..." I mainly do killers so miss out on getting much practice at his suggestions. Cheers Ed |
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