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 Post subject: ERs in a jigsaw
PostPosted: Sun Aug 18, 2013 11:14 pm 
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Grand Master
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Joined: Thu Apr 24, 2008 4:27 pm
Posts: 778
I'm still trying to get a handle on ERs in vanilla 9x9, so I'm really clueless with one in a jigsaw. This is Grid 2 of a Samurai jigsaw. I'm almost finished with the puzzle (Grids 1, 4, and 5 complete, and Grid 3 almost complete), so I really hate to quit now, especially since ER is my next technique to learn. Can someone please help me understand the logic here?

SudokuSolver shows as the next step:

Quote:
Empty Rectangle on candidate 3 at n2(r1>c6) - r7c6=r7c7


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 Post subject: Re: ERs in a jigsaw
PostPosted: Tue Sep 03, 2013 9:19 am 
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Grand Master
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Joined: Wed Apr 30, 2008 9:45 pm
Posts: 549
Consider LOL on C789 r5678c6 == r4789c7
R7: 3 in c67 hence 3 in the LOL so 3 locked in r78c6
so r6c6&r7c7=33 or r6c7&r7c6 =33

However the empty rectangle approach confuses me!


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