The New Sudoku Players' Forum

by **Hajime** » Tue Sep 19, 2023 3:15 pm

Code: Select all: 2 8 . . . 9 . . . . . . 4 . . 7 . . 5 4 9 . . . 2 . . 4 9 8 . 1 . . . . . 1 . . 5 2 8 7 . . . . . . . . . . 8 6 . 2 . . 4 . . . . . . 3 4 . 6 . . . . . . 1 3 . .

by **Cenoman** » Tue Sep 19, 2023 7:28 pm

Code: Select all: +------------------+--------------------+----------------------+ | 2 8 7 | 135 6 9 | 15 4 135 | | 6 3 1 | 4 2 a58 | 7 589 589 | | 5 4 9 | 1378 7-8 378 | 2 138 6 | +------------------+--------------------+----------------------+ | 4 9 8 | 37 1 367 | 56 235 235 | | 3 1 6 | 9 5 2 | 8 7 4 | | 7 25* 25* | 38 4 368 | 169 139 139 | +------------------+--------------------+----------------------+ | 8 6 3 | 2 9 b57 | 4 15 157 | | 1 25+7* 25* | 578 3 4 | 59 6 25789 | | 9 257 4 | 6 c78 1 | 3 258 2578 | +------------------+--------------------+----------------------+

1. Y-Wing: (8=5)r2c6 - (5=7)r7c6 - (7=8)r9c5 => -8 r3c5; 4 placements
2. UR(25)r68c23 using single internal => +7 r8c2; 15 placements

Code: Select all: +-----------------+-------------------+------------------+ | 2 8 7 | a13 6 9 | 5-1 4 b135 | | 6 3 1 | 4 2 5 | 7 8 9 | | 5 4 9 | 138 7 38 | 2 13 6 | +-----------------+-------------------+------------------+ | 4 9 8 | 7 1 36 | 56 35 2 | | 3 1 6 | 9 5 2 | 8 7 4 | | 7 2 5 | 38 4 368 | d16 9 c13 | +-----------------+-------------------+------------------+ | 8 6 3 | 2 9 7 | 4 15 15 | | 1 7 2 | 5 3 4 | 9 6 8 | | 9 5 4 | 6 8 1 | 3 2 7 | +-----------------+-------------------+------------------+

3. M2-Wing: (1=3)r1c4 - r1c9 = (3-1)r6c9 = (1)r6c7 => -1 r1c7; ste

Noforce 19sept2023