David P Bird wrote:denis_berthier wrote:Hi David,
I can't see why the Q and R pairs should be in different blocks/boxes. Indeed, my proof works without this assumption.
I think the right condition is:
The two Object Cell Pairs (Q and R) occur in the same band as the Base Cell Pair (B) (the JE band) but not in the same block/box.
Wow! I've been working with a pair of blinkers on! I've been considering that the Braid Analysis constraints always had an important part to play in the pattern (although expressing them in Braiding terms has never been needed).
With the targets in the same box, these constraints go and are replaced by the more restrictive box ones, so I guess these cases will occur far less frequently.
Just as I was beginning to think I could see light at the end of the tunnel!
As long as this has come up, I should mention that there's no reason to restrict the target cells to the base cell band.
Here's an alternate proposal for the (core of the) pattern definition:
- Code: Select all
*-------*-------*-------*
| B B . | . . . | . . . | B = base cells
| . . . | S . . | S . . | S = fish column cells
| . . . | S . . | S . . |
*-------*-------*-------*
| . . S | S . . | S . . | T : two S cells are designated as target cells
| . . S | S . . | S . . |
| . . S | S . . | S . . |
*-------*-------*-------*
| . . S | S . . | S . . | Requirement: for each base digit, the candidates
| . . S | S . . | S . . | in the S cells are restricted to two rows and the
| . . S | S . . | S . . | target cells
*-------*-------*-------*
Here's an example from champagne's "potential hardest" list.
- Code: Select all
#9004 GP;H2447
98.7.......7.6.9....6.5....4......3..9...2..1...6..5..1.......4.3.....2...98..7..
+---------------------+-----------------------+--------------------+
| 9 8 12345 | 7 1234(B) 134(B) | 12346 1456 2356 |
| 235 1245 7 | 1234 6 1348 | 9 1458 2358 |
| 23 124 6 | 12349 5 13489 | 1234-8 1478 2378 |
+---------------------+-----------------------+--------------------+
| 4 12567 1258 | 159 1789 1579 | 268 3 26789 |
| 35678 9 358 | 345 3478 2 | 468 4678 1 |
| 2378 127 123-8 | 6 134789 13479 | 5 4789 2789 |
+---------------------+-----------------------+--------------------+
| 1 2567 258 | 2359 2379 35679 | 368 5689 4 |
| 5678 3 458 | 1459 1479 145679 | 168 2 5689 |
| 256 2456 9 | 8 1234 13456 | 7 156 356 |
+---------------------+-----------------------+--------------------+
S S S
Base cells: r1c56
S columns: c347
Target cells: r3c7, r6c3
XSudo output:
14 Truths = {1234C3 1234C4 1234C7 1N56}
18 Links = {1234r1 12r4 34r5 23r7 14r8 6n3 3n7 1234b2}
2 Eliminations --> r3c7<>8, r6c3<>8
Regards,
Blue.