The New Sudoku Players' Forum

by **tarek** » Sat Feb 15, 2020 12:44 pm

Code: Select all: +-------+-------+-------+ | 7 3 . | . 5 . | . 1 6 | | . . . | . . . | . . . | | 4 . . | 3 . 2 | . . 8 | +-------+-------+-------+ | . . . | . . . | . . . | | . 9 . | 1 . 3 | . 5 . | | . . . | 8 9 7 | . . . | +-------+-------+-------+ | 5 8 . | . . . | . 3 7 | | 6 . 3 | . . . | 4 . 2 | | . . 2 | . . . | 5 . . | +-------+-------+-------+ 73..5..16.........4..3.2..8..........9.1.3.5....897...58.....376.3...4.2..2...5..

by **tarek** » Sat Feb 15, 2020 12:44 pm

I've sneaked in this tougher one

by **pjb** » Sun Feb 16, 2020 3:17 am

Couldn't find a single step, so here's two :

Code: Select all: 7 3 89 | 49 5 489 | 2 1 6 1289 126 1689 | 679 78 1689 | 3 4 5 4 156 156 | 3 16 2 | 79 79 8 ------------------------+----------------------+--------------------- 1238 126 1678 | 2456 246 456 | 1789 279 139 28 9 678 | 1 26 3 | 78 5 4 123 45 45 | 8 9 7 | 16 26 13 ------------------------+----------------------+--------------------- 5 8 149 | 2469 1246 1469 | 169 3 7 6 b17 3 | 579 b78 1589 | 4 b89 2 a19 47 2 | 467 3 468 | 5 68 1-9

(9=1)r9c1 - (1=9)r8c258 => -9 r9c9

Code: Select all: 7 3 89 | 49 5 489 | 2 1 6 e128 126 1689 | 679 d78 1689 | 3 4 5 4 156 156 | 3 16 2 | 9-7 a79 8 ------------------------+----------------------+--------------------- 3 126 1678 | 2456 246 456 | 178 2-7 9 f28 9 678 | 1 26 3 |g78 5 4 12 45 45 | 8 9 7 | 16 26 3 ------------------------+----------------------+--------------------- 5 8 14 | 2469 1246 1469 | 69 3 7 6 17 3 | 579 c78 1589 | 4 b89 2 9 47 2 | 467 3 468 | 5 68 1

(7=9)r3c8 - (9=8)r8c8 - (8=7)r8c5 - (7=8)r2c5 - r2c1 = r5c1 - (8=7)r5c7 => -7 r3c7, r4c8; stte

Phil

by **Mauriès Robert** » Sun Feb 16, 2020 7:53 am

Hi all,
Here's my one-step TDP resolution.
P'(8r8c5) : -8r8c5-> --- ->8r9c8 (see diagram and puzzle) => -8r8c8, stte

Code: Select all: ------------------------>(1r6c7and3r6c9)->2r6c1->6r6c8->8r9c8 / | ->7r9c2->4r7c3->9r9c1>1r9c9->3r6c9->12r6c1 | / \ \ | -8r8c5->7r8c5->8r2c5---------->12r2c1------------->8r5c4->8r4c7

puzzle: Show

by **Cenoman** » Sun Feb 16, 2020 10:12 pm

Code: Select all: +----------------------+-----------------------+---------------------+ | 7 3 89 | 49 5 489 | 2 1 6 | | 1289 126 1689 | 679 78 1689 | 3 4 5 | | 4 156 156 | 3 16 2 | 79 79 8 | +----------------------+-----------------------+---------------------+ | 1238 126 1678 | 2456 246 456 | 1789 279 139 | | 28 9 678 | 1 26 3 | 78 5 4 | | 123 45 45 | 8 9 7 | 16 26 13 | +----------------------+-----------------------+---------------------+ | 5 8 149 | 2469 1246 1469 | 169 3 7 | | 6 17 3 | 579 78 1589 | 4 9-8 2 | | 19 47 2 | 467 3 468 | 5 68 19 | +----------------------+-----------------------+---------------------+

Double kraken cell (169)r7c7 & row (8)r4c137, as a net:

Code: Select all: (6)r7c7 - r6c7 = r6c8 - (6=8)r9c8 * || (1)r7c7 - - - - - - - - - - - - - - - - (1)r9c9 = r9c1 - (1=78)r8c25 * || / || (8-39)r4c19 = (9)r9c9 || || (9)r7c7 - (9=78)r35c7 - (8)r4c7 || (8)r4c3 - r1c3 = r1c6 - r2c5 = (8)r8c5 * --------------- => -8 r8c8; ste

February 15, 2020