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A General Logic for Sudoku Golden Nugget |
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Elimination 39 Elimination 39 has the following set logic interpretation. A, the logic is rank 1 with 6 sets and 7 linksets, which would need 2 overlap linksets for elimination. B, the linkset triplet at 4r2c7 raises the rank in the upper (digit 2) level to 0. C, the set triplet at 2r2c7 then lowers the rank back to 1 except along its minor branch, row set 2r2, which is still rank 0 (black highlight) and eliminates candidate 2r2c5 (orange).
Set Logic and Grid E39a
15 Nodes, Rank 1: 6 Sets = {2c378 4c3 2n7 4b6} 7 Links = {2r126 4r25 4c7 4n8} --> (2r2) => r2c5<>2
+--------------------------------------------------------------------+ | 257
145 157(2) | 68 2467
678 | 14(2) 3
9 | | 89
89 7(24) | 3
247 1 | (24)
6 5
| | 26
146 3 | 29
5 49 | 8
147 147 |
+--------------------------------------------------------------------+ | 235
345 8 | 15
9 357 | 1357(4 17(24) 6 | | 359
7 6(4) | 1568
136 2 | 359(4) 189(4) 138(4) | | 1
3569 56(2) | 4
367 35678 | 3579
789(2) 378 |
+--------------------------------------------------------------------+ | 367
136 9 | 126
8 346 | 1347
5 24
| | 3578
2 157 | 159
134 3459 | 6
14789 13478 | | 4
368 156 | 7
1236 3569 | 139
189 1238 |
+--------------------------------------------------------------------+ Logic Diagram |
