The New Sudoku Players' Forum

by **tarek** » Thu Jul 30, 2020 9:24 pm

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

by **rjamil** » Fri Jul 31, 2020 10:06 am

An attempt to solve in two baby steps:

Code: Select all: .....5..98.9...7..3......4.297.8...3...2.3....8..5.....1...6.5...21.7........439. +-----------------+-----------------+-----------------+ | 1467 2467 16 | 6(3-7) 1467 5 | 8 1(23) 9 | | 8 456 9 | 36 146 2 | 7 13 56 | | 3 2567 156 | 9 167 8 | 16 4 256 | +-----------------+-----------------+-----------------+ | 2 9 7 | 4 8 1 | 5 6 3 | | 146 456 156 | 2 67 3 | 9 17 8 | | 16 8 3 | (7)-6 5 9 | 14 1(2-7) 24 | +-----------------+-----------------+-----------------+ | 9 1 4 | 8 3 6 | 2 5 7 | | 5 3 2 | 1 9 7 | 46 8 46 | | 67 67 8 | 5 2 4 | 3 9 1 | +-----------------+-----------------+-----------------+

1) Strong Wing: SL 3 @ r1c48 2 @ r16c8 7 @ r16c4 r6c48 => -6 @ r6c4 => -7 @ r1c4 r6c8; and after basics

Code: Select all: +-------------+--------------+-----------------+ | 14 27 16 | 36 147 5 | 8 123 9 | | 8 45 9 | (36) 14 2 | 7 (13) 5-6 | | 3 27 156 | 9 17 8 | (16) 4 256 | +-------------+--------------+-----------------+ | 2 9 7 | 4 8 1 | 5 6 3 | | 14 45 15 | 2 6 3 | 9 7 8 | | 6 8 3 | 7 5 9 | 14 12 24 | +-------------+--------------+-----------------+ | 9 1 4 | 8 3 6 | 2 5 7 | | 5 3 2 | 1 9 7 | 46 8 46 | | 7 6 8 | 5 2 4 | 3 9 1 | +-------------+--------------+-----------------+

2) XY-Wing: 136 @ r2c48 r3c7 => -6 @ r2c9; stte

R. Jamil

by **SpAce** » Sat Aug 01, 2020 12:05 am

Code: Select all: .-----------------.---------------.----------------. | 1467 2467 16 | 367 1467 5 | 8 123 9 | | 8 456 9 | c36 146 2 | 7 d13 5-6 | | 3 2567 156 | 9 167 8 | d16 4 256 | :-----------------+---------------+----------------: | 2 9 7 | 4 8 1 | 5 6 3 | | 146 456 156 | 2 a67 3 | 9 a7-1 8 | | 16 8 3 | b67 5 9 | 14 127 24 | :-----------------+---------------+----------------: | 9 1 4 | 8 3 6 | 2 5 7 | | 5 3 2 | 1 9 7 | 46 8 46 | | 67 67 8 | 5 2 4 | 3 9 1 | '-----------------'---------------'----------------'

(76)r5c85 = r6c4 - @(6=3)r2c4 - (3=16)b3p57 => -1 r5c8, -6 r2c9; stte

by **Cenoman** » Sat Aug 01, 2020 9:45 pm

Code: Select all: +----------------------+--------------------+-------------------+ | 1467 2467 16 | 367 1467 5 | 8 123 9 | | 8 456* 9 | 36* 146* 2 | 7 13 56* | | 3 2567 156 | 9 167 8 | 16 4 256 | +----------------------+--------------------+-------------------+ | 2 9 7 | 4 8 1 | 5 6 3 | | 146 456 156 | 2 67 3 | 9 17 8 | | 16 8 3 | 67 5 9 | 14 127 24 | +----------------------+--------------------+-------------------+ | 9 1 4 | 8 3 6 | 2 5 7 | | 5 3 2 | 1 9 7 | 46 8 46 | | 67 67 8 | 5 2 4 | 3 9 1 | +----------------------+--------------------+-------------------+

Kraken row (6)r2c2459

Code: Select all: (6)r2c4 || (6)r2c2 - r13c3 = r5c3 || \ || (6=71)r5c58 - (1=3)r2c8 || / (6)r2c5 - - - - - - - || (6)r3c9 - (6=13)b3p57 ------------------------ => -6 r2c4; ste

...better presented as a 6x6 TM

Code: Select all: 3r2c8 1r2c8 1r5c8 7r5c8 7r5c5 6r5c5 6r5c3 6r13c3 1r3c7 6r3c7 6r2c4 6r2c5 6r2c2 6r2c9 ----------------------- => -6 r2c4; ste

July 30, 2020