The New Sudoku Players' Forum

by **200e200w** » Mon Feb 12, 2018 9:59 am

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

Enjoy solving!

200e200w

by **Leren** » Mon Feb 12, 2018 10:44 am

Code: Select all: *--------------------------------------------------* |b28 c278 78 | 1 4 3 | 5 6 9 | | 36 4 356 | 569 2 569 | 1 7 8 | | 1 c56 9 | 8 56 7 | 3 4 2 | |-------------------+---------------+--------------| | 7 3 156 | 24569 56 1569 | 246 8 456 | |a68 168-5 2 |a3456 7 1568 |a46 9 a3456 | | 4 9 568 | 2356 38 568 | 267 1 3567 | |-------------------+---------------+--------------| | 5 c68 4 | 7 9 2 | 68 3 1 | | 9 c678 3678 | 356 1 568 | 4678 2 467 | | 2368 12678 13678 | 36 38 4 | 9 5 67 | *--------------------------------------------------*

ALS XY Wing: (5=8) r5c1479 - (8=2) r1c1 - (2=5) r1378c2 => - 5 r5c2; stte

Leren

by **Cenoman** » Mon Feb 12, 2018 1:54 pm

Code: Select all: +-------------------------+----------------------+---------------------+ | c28 278 78 | 1 4 3 | 5 6 9 | | 36 4 356 | 569 2 569 | 1 7 8 | | 1 56 9 | 8 56 7 | 3 4 2 | +-------------------------+----------------------+---------------------+ | 7 3 156 | 24569 56 1569 | 246 8 456 | | b68 af18-56 2 | 3456 7 a1568 | 46 9 3456 | | 4 9 568 | 2356 38 568 | 267 1 3567 | +-------------------------+----------------------+---------------------+ | 5 68 4 | 7 9 2 | 68 3 1 | | 9 678 3678 | 356 1 568 | 4678 2 467 | | d2368 e12678 13678 | 36 38 4 | 9 5 67 | +-------------------------+----------------------+---------------------+

Almost hidden pair (18)r5c26:
(18)r5c26 = (8)r5c1 - (8=2)r1c1 - r9c1 = (2-1)r9c2 = (1)r5c2 => -56 r5c2; stte

by **SteveG48** » Mon Feb 12, 2018 10:39 pm

Code: Select all: *---------------------------------------------------------------------* | 28 278 78 | 1 4 3 | 5 6 9 | | 36 4 356 | 569 2 569 | 1 7 8 | | 1 f56 9 | 8 e56 7 | 3 4 2 | *----------------------+-----------------------+----------------------| | 7 3 ab16-5 | 24569 bd56 b1569 | 246 8 b456 | |c68 g568-1 2 | 3456 7 c1568 |c46 9 3456 | | 4 9 568 | 2356 38 568 | 267 1 3567 | *----------------------+-----------------------+----------------------| | 5 68 4 | 7 9 2 | 68 3 1 | | 9 678 3678 | 356 1 568 | 4678 2 467 | | 2368 12678 13678 | 36 38 4 | 9 5 67 | *---------------------------------------------------------------------*

1r4c3 = (1456)r4c3569 - (1|4=568)r5c167 - 5r4c5 = r3c5 - r3c2 = 5r5c2 => -1 r5c2, -5 r4c3 ; stte

by **morl** » Tue Feb 13, 2018 12:12 am

Dual Forcing Chain starting in r4c5

5r4c5->46r4c9,46r5c7->2r4c7
6r4c5->5r3c5->6r3c2->8r7c2->6r7c7->4r5c7->2r4c7

-46r4c7

200e200w's Nightmare #17