The New Sudoku Players' Forum

by **urhegyi** » Sat Jan 30, 2021 9:26 pm

Can someone explain why I find lots of solving patterns a second time?

Code: Select all: ......16...192......5..7..33....2.5.5..8...........3.6.3..7...26.....9...2..8.7..

Code: Select all: .------------------------.----------------------.---------------------. | 24789 4789 234789 | 345 345 3458 | 1 6 45789 | | 478 4678 1 | 9 2 34568 | 458 478 4578 | | 2489 4689 5 | 146 146 7 | 248 2489 3 | :------------------------+----------------------+---------------------: | 3 146789 46789 | 1467 1469 2 | 48 5 14789 | | 5 14679 24679 | 8 13469 13469 | 24 12479 1479 | | 124789 14789 24789 | 1457 1459 1459 | 3 124789 6 | :------------------------+----------------------+---------------------: | 1489 3 489 | 1456 7 14569 | 4568 148 2 | | 6 14578 478 | 12345 1345 1345 | 9 1348 1458 | | 149 2 49 | 13456 8 134569 | 7 134 145 | '------------------------'----------------------'---------------------'

by **pjb** » Sat Jan 30, 2021 11:14 pm

This is the grid after basics, your grid is the result of naked singles only.

Code: Select all: 2 79 3 | 4 5 8 | 1 6 79 478 6 1 | 9 2 3 | 5 78 47 489 489 5 | 16 16 7 | 248 289 3 ------------------------+----------------------+--------------------- 3 14789 489 | 167 1469 2 | 48 5 1479 5 1479 6 | 8 3 14 | 24 279 1479 4789 14789 2 | 17 149 5 | 3 789 6 ------------------------+----------------------+--------------------- 148 3 48 | 5 7 9 | 6 14 2 6 5 7 | 2 14 14 | 9 3 8 149 2 49 | 3 8 6 | 7 14 5

This can be solved with a single complex chain or repeated simple chains.

Phil

sudoku with lot of patterns found 2 times