Posted: Sun Dec 30, 2007 8:35 pm
rep'nA's puzzle continued...
Highlight [99] and [09] and we can apply a variant of the hidden pairs technique. On the left side, you will find that [99] straddles across the two [09]s, so the left side can have either [99] or [09], but not both. This means that on the right hand side, we have either [99] or [09]. So we can add two borders on the right hand side.
Continue with [09] highlighted, focus on the r7c1 cell. The r7c1 cell can only be either [09] or [01]. If it is [01], we have a border between r8c1 and r9c1. If it is [09], then the [09] at r8c23 is blocked, and then to avoid the non-unique square at r89c12, we will need a border between r8c1 and r9c1. Hence we can add that border across [13].
What's next?
Code: Select all
6712318075115xnj1744948euqc05@23495wr3@86574382qq9c8376684r1me9803k937392uj95190402eae173110156p86#5082m788zpj
.-------------------------------------------.
| 6 7 1 2 3 1 8 0 7 5 1 |
| + +---+---+ + + + + + + |
| 1 5 | 3 3 | 9 1 7 4 4 9 4 |
| + +---+---+ + + +---+ + + |
| 8 | 4 | 0 6 | 2 0 5 | 6 2 3 4 |
| + +---+---+ +---+ + + + + |
| 9 5 | 2 7 3 | 6 8 6 5 7 4 |
| + + +---+---+ + + + + + |
| 3 8 2 6 6 9 | 2 8 3 7 6 |
| + + +---+ +---+ + + + + |
| 6 8 4 7 1 2 | 4 9 8 0 3 |
|---+ + + + + + +---+ + + |
| 0 9 3 7 3 9 2 | 0 | 9 9 5 |
| + + + + + + + + + + |
| 1 9 0 4 0 2 | 4 | 0 | 4 1 7 |
| + + + + + + +---+ + +---|
| 3 1 1 0 1 5 6 5 8 6 | 7 |
| + + + +---+ + + +---+---+ |
| 5 0 8 2 2 7 8 8 | 5 5 | 9 |
'-------------------------------------------'
Code: Select all
6712318075115xnj1744948euqc05@23495wr3@86574382qq9c8376684r1me9803k937392uj9f190402eael73110156p86#5082m788zpj
.-------------------------------------------.
| 6 7 1 2 3 1 8 0 7 5 1 |
| + +---+---+ + + + + + + |
| 1 5 | 3 3 | 9 1 7 4 4 9 4 |
| + +---+---+ + + +---+ + + |
| 8 | 4 | 0 6 | 2 0 5 | 6 2 3 4 |
| + +---+---+ +---+ + + + + |
| 9 5 | 2 7 3 | 6 8 6 5 7 4 |
| + + +---+---+ + + + + + |
| 3 8 2 6 6 9 | 2 8 3 7 6 |
| + + +---+ +---+ + + + + |
| 6 8 4 7 1 2 | 4 9 8 0 3 |
|---+ + + + + + +---+ + + |
| 0 9 3 7 3 9 2 | 0 | 9 9 | 5 |
| + + + + + + + + +---+ |
| 1 9 0 4 0 2 | 4 | 0 | 4 1 7 |
| + + + + + + +---+ + +---|
| 3 1 1 0 1 5 6 5 8 6 | 7 |
| + + + +---+ + + +---+---+ |
| 5 0 8 2 2 7 8 8 | 5 5 | 9 |
'-------------------------------------------'
Code: Select all
6712318075115xnj1744948euqc05@23495wr3@86574382qq9c8376684r1me9803k937392uj9f190402eael7n110156p86#5082m788zpj
.-------------------------------------------.
| 6 7 1 2 3 1 8 0 7 5 1 |
| + +---+---+ + + + + + + |
| 1 5 | 3 3 | 9 1 7 4 4 9 4 |
| + +---+---+ + + +---+ + + |
| 8 | 4 | 0 6 | 2 0 5 | 6 2 3 4 |
| + +---+---+ +---+ + + + + |
| 9 5 | 2 7 3 | 6 8 6 5 7 4 |
| + + +---+---+ + + + + + |
| 3 8 2 6 6 9 | 2 8 3 7 6 |
| + + +---+ +---+ + + + + |
| 6 8 4 7 1 2 | 4 9 8 0 3 |
|---+ + + + + + +---+ + + |
| 0 9 3 7 3 9 2 | 0 | 9 9 | 5 |
| + + + + + + + + +---+ |
| 1 9 0 4 0 2 | 4 | 0 | 4 1 7 |
|---+ + + + + + +---+ + +---|
| 3 1 1 0 1 5 6 5 8 6 | 7 |
| + + + +---+ + + +---+---+ |
| 5 0 8 2 2 7 8 8 | 5 5 | 9 |
'-------------------------------------------'