The New Sudoku Players' Forum

[200e200w]

Code: Select all

. . 6|. . .|1 . 8
. 3 .|9 . .|. . .
9 . .|. . 6|4 3 .
-----+-----+-----
. 2 9|. . .|3 . .
8 . 5|2 . 3|7 . 9
. . 3|. . .|5 4 .
-----+-----+-----
. 6 8|4 . .|. . 3
. . .|. . 9|. 2 .
7 . 2|. . .|8 . .


200e200w

[SpAce]

My p&p steps:

1. Skyscraper: (1)r5c2 = r8c2 - r8c9 = (1)r4c9 => -1 r4c6
2. Kite: (4)r5c5 = r5c2 - r4c1 = (4)r2c2 => -4 r2c5
3. AIC: (4)r5c5 = r5c2 - (4=6)r4c1 - r6c1 = r6c4 - (6=3)r9c4 - r1c4 = (3)r1c5 => -4 r1c5
4. W-Wing: (5=1)r9c6 - r9c8 = r7c8 - (1=5)r7c1 => -5 r7c5
5. AIC (Grouped): (7)r4c6 = (7-4)r1c6 = (4-5)r1c2 = r8c2 - r8c45 = (5)r9c6 => -5 r4c6
6. Empty Rectangle: (5)r9c6 = r8c45 - r8c2 = (5)r1c2 => -5 r1c6
7. Skyscraper: (1)r2c1 = r6c1 - r6c4 = (1)r3c3 => -1 r3c3, r2c56; stte