The New Sudoku Players' Forum

by **P.O.** » Tue Mar 05, 2024 6:38 pm

Code: Select all: 8 . . . . . . . 2 . 2 . . . 5 . 9 . . . 7 . 3 . 4 . . . 3 . 4 . . . 8 . 7 . . . . . . . 1 . . . . . 2 . . . . . 9 . 6 . 3 . . . 5 . 1 . . . 4 . 1 . . . . . . . 6 8.......2.2...5.9...7.3.4...3.4...8.7.......1.....2.....9.6.3...5.1...4.1.......6 after singles: 8 6 3 79 479 479 1 5 2 4 2 1 6 8 5 7 9 3 5 9 7 2 3 1 4 6 8 69 3 25 4 1 679 2569 8 579 7 48 2458 3589 59 3689 2569 23 1 69 1 58 35789 579 2 569 37 4 2 478 9 578 6 478 3 1 57 3 5 6 1 279 789 289 4 79 1 478 48 35789 24579 34789 2589 27 6

by **Cenoman** » Tue Mar 05, 2024 9:34 pm

Code: Select all: +--------------------+--------------------------+--------------------+ | 8 6 3 | 79 a479 479 | 1 5 2 | | 4 2 1 | 6 8 5 | 7 9 3 | | 5 9 7 | 2 3 1 | 4 6 8 | +--------------------+--------------------------+--------------------+ | 69 3 25 | 4 1 679 | 2569 8 579 | | 7 48 2458 | 3589 59 3689 | 2569 23 1 | | 69 1 c58 | d35789 579* 2 | 569 d37* 4 | +--------------------+--------------------------+--------------------+ | 2 478 9 | 578 6 478 | 3 1 57 | | 3 5 6 | 1 A279 789 | A289 4 79 | | 1 48-7 b48 | 35789 a24579* 34789 | 2589 Be27* 6 | +--------------------+--------------------------+--------------------+

Almost-almost X-Wing
(74)r19c5 - (4=8)r9c3 - r6c3 = (83-7)r6c48 = (7)r9c8
(72)r8c57 - (2=7)r9c8
XW(7)c58\r69
=> -7 r9c2; ste

by **P.O.** » Fri Mar 08, 2024 6:23 pm

Code: Select all: 7r9c2 => r9c5 <> 2,4,5,7,9 r9c2=7 - r9c8{n7 n2} r9c2=7 - c8n7{r9 r6} - r6n3{c8 c4} - r6n8{c4 c3} - r9c3{n8 n4} r9c2=7 - c8n7{r9 r6} - 59r56c5 => r9c2 <> 7 ste.

Puzzle 171