The New Sudoku Players' Forum

[m_b_metcalf]

Code: Select all

 . . 1 2 3 4 . . .
 . . 5 . . . 6 . .
 . . 7 . . . 2 . .
 . . 2 . . . 5 . .
 . . 4 8 5 9 . . .
 . . 8 7 . . . . .
 . . 9 6 . . . . .
 . . 6 1 . . . . .
 . . 3 4 . . . . .   moderate

 . . 1 2 3 4 . . .
 . . 5 . . . 6 . .
 . . 7 . . . 2 . .
 . . 2 . . . 5 . .
 . . 4 3 5 8 . . .
 . . 3 1 . . . . .
 . . 8 7 . . . . .
 . . 9 6 . . . . .   harder

[Leren]

Hi Mike,

There appears to be a row missing from the 2nd puzzle. It could be

Code: Select all

 . . 1 2 3 4 . . .
 . . 5 . . . 6 . .
 . . 7 . . . 2 . .
 . . 2 . . . 5 . .
 . . 4 3 5 8 . . .
 . . 3 1 . . . . .
 . . 8 7 . . . . .
 . . 9 6 . . . . .
 . . 6 4 . . . . .

Leren

[m_b_metcalf]

There appears to be a row missing from the 2nd puzzle. It could be

Code: Select all

 . . 1 2 3 4 . . .
 . . 5 . . . 6 . .
 . . 7 . . . 2 . .
 . . 2 . . . 5 . .
 . . 4 3 5 8 . . .
 . . 3 1 . . . . .
 . . 8 7 . . . . .
 . . 9 6 . . . . .
 . . 6 4 . . . . .

Leren,
Thanks. Sorry, you're right.

Nike

[Hajime]

Without givens in row 9 a minimal puzzle is possible:

Code: Select all

. . 6 5 3 4 . . .
. . 5 . . . 6 . .
. . 7 . . . 2 . .
. . 2 . . . 8 . .
. . 4 3 5 8 . . .
. . 3 4 . . . . .
. . 8 7 . . . . .
. . 9 6 . . . . .
. . . . . . . . .

..6534.....5...6....7...2....2...8....4358.....34.......87.......96..............   ED=8.8/1.0/1.0
..1824.....5...1....7...2....2...5....4358.....31.......87.......94..............   ED=9.0/1.0/1.0
..1238.....5...4....7...2....2...5....4357.....31.......87.......95..............   ED=9.4/1.0/1.0


Only 3 minimals found in a {-4,+4} vicinity search

[Hajime]

Mike's puzzle ..1234.....5...6....7...2....2...5....4358.....31.......87.......96.......64..... needs
2 X-chains of length 4 cells (Turbot Crane, Skyscraper), 2 X-chains of length 6 and 3 XY chains (I think)

Easy and difficult alternatives:

Code: Select all

..1594.....5...6....7...2....2...5....4368.....31.......87.......96.......64..... easy
naked/hidden singles only
..1834.....5...3....7...2....2...5....4368.....31.......87.......96.......64..... difficult
last without forcing chains/nets, but needs an AIC chain