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| ERs in a jigsaw http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=10&t=1179 |
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| Author: | enxio27 [ Sun Aug 18, 2013 11:14 pm ] |
| Post subject: | ERs in a jigsaw |
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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| Author: | HATMAN [ Tue Sep 03, 2013 9:19 am ] |
| Post subject: | Re: ERs in a jigsaw |
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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