.5....6..61.....4.2.75.4......9.6.....8..5.....2...1.998......1.....1.5....82....
.-----------------------------------------------------------.
| 8 5 4 | 1 37 9 | 6 237 237 |
| 6 1 9 | 37 8 2 | 357 4 357 |
| 2 3 7 | 5 6 4 | 9 1 8 |
|-------------------+-------------------+-------------------|
| 347 47 1 | 9 37 6 | 25 8 25 |
| 37 9 8 | 2 1 5 | 347 6 347 |
| 5 6 2 | 37 4 8 | 1 37 9 |
|-------------------+-------------------+-------------------|
| 9 8 36 | 46 5 37 | 2347 237 1 |
| 47 2 36 | 46 9 1 | 8 5 347 |
| 1 47 5 | 8 2 37 | 347 9 6 |
'-----------------------------------------------------------'
Hajime wrote:Grouped skyscraper in box89 on digit 7. r8c9<>7. r8c1=7
*----------------------------------------*
| 8 5 4 | 1 37 9 | 6 2-37 237 |
| 6 1 9 |c37 8 2 |d357 4 d357 |
| 2 3 7 | 5 6 4 | 9 1 8 |
|-----------+----------+-----------------|
| 347 47 1 | 9 37 6 | 25 8 25 |
| 37 9 8 | 2 1 5 | 347 6 347 |
| 5 6 2 |b37 4 8 | 1 a37 9 |
|-----------+----------+-----------------|
| 9 8 36 | 46 5 37 | 2347 237 1 |
| 47 2 36 | 46 9 1 | 8 5 347 |
| 1 47 5 | 8 2 37 | 347 9 6 |
*----------------------------------------*
*------------------------------------*
| 8 5 4 | 1 37 9 | 6 2 37 |
| 6 1 9 |c37 8 2 |d37 4 5 |
| 2 3 7 | 5 6 4 | 9 1 8 |
|----------+----------+--------------|
| 347 47 1 | 9 37 6 | 5 8 2 |
| 37 9 8 | 2 1 5 | 4-37 6 347 |
| 5 6 2 |b37 4 8 | 1 a37 9 |
|----------+----------+--------------|
| 9 8 6 | 4 5 37 | 2 37 1 |
| 47 2 3 | 6 9 1 | 8 5 47 |
| 1 47 5 | 8 2 37 | 347 9 6 |
*------------------------------------*
jco wrote:Hajime wrote:Grouped skyscraper in box89 on digit 7. r8c9<>7. r8c1=7
I do not see a Grouped skyscraper for this puzzle.
(I see two remote pairs in sequence solving the puzzle)
Notice (7)r9c2. It spoils the Grouped skyscraper.
If (7)r9c7 is false, then we can have (7)r9c6 or (7)r9c2.