The New Sudoku Players' Forum

by **tarek** » Sun Aug 09, 2020 5:23 pm

Code: Select all: +-------+-------+-------+ | . 9 . | 5 . . | . . 6 | | 8 . . | . 2 1 | . . . | | . . . | 7 . . | 9 . . | +-------+-------+-------+ | 3 . 7 | . . . | . . . | | . 1 . | . . . | . 4 . | | . 2 . | . . . | 8 7 . | +-------+-------+-------+ | . . 1 | . . 6 | . . . | | . . . | . 9 4 | . . 7 | | 2 . . | . . . | . 8 1 | +-------+-------+-------+ .9.5....68...21......7..9..3.7.......1.....4..2....87...1..6.......94..72......81

by **Ajò Dimonios** » Sun Aug 09, 2020 6:51 pm

Code: Select all: +---------------+--------+--------------+ | 17 9 23 | 5 4 8 | 1237 123 6 | | 8 3567 356 | 9 2 1 | 347 35 45 | | 145 45 245 | 7 6 3 | 9 125 8 | +---------------+--------+--------------+ | 3 48 7 | 48 5 2 | 16 16 9 | | 9 1 68 | 68 3 7 | 5 4 2 | | 456 2 456 | 46 1 9 | 8 7 3 | +---------------+--------+--------------+ | 457 3457 1 | 2 8 6 | 34 9 45 | | 56 3568 3568 | 1 9 4 | 236 2356 7 | | 2 46 9 | 3 7 5 | 46 8 1 | +---------------+--------+--------------+

7r1c1=(7-6)r2c2=6r2c3-(6=8)r5c3-(8=4)r4c2-4r79c2=(4-7)r7c1=7r1c1=>+7r1c1=>Stte

r1c1=7;r2c3=6;r5c3=8;r4c2=4;r7c1=4 are backdoors.

Paolo

by **eleven** » Sun Aug 09, 2020 8:19 pm

Code: Select all: *-----------------------------------------------------------* | 17 9 d23 | 5 4 8 | 1237 123 6 | | 8 367-5 d356 | 9 2 1 | 347 35 45 | | 1-45 da45 da245 | 7 6 3 | 9 125 8 | |-----------------------+-------------+---------------------| | 3 c48 7 | 48 5 2 | 16 16 9 | | 9 1 c68 | 68 3 7 | 5 4 2 | | 456 2 b456 | 46 1 9 | 8 7 3 | |-----------------------+-------------+---------------------| | 457 3457 1 | 2 8 6 | 34 9 45 | | 56 3568 3568 | 1 9 4 | 236 2356 7 | | 2 46 9 | 3 7 5 | 46 8 1 | *-----------------------------------------------------------*

(45=2)r3c23 - 4r3c3 = r6c3 - (4=86)b4p26 - (6=2345)b1p3689 => -45r3c1,-5r2c2; stte

@Paolo: you also can stop with ... =4r7c1 => -7r7c1, stte

by **Ajò Dimonios** » Sun Aug 09, 2020 9:01 pm

Hi Eleven

Yes certainly thank you.

Paolo

by **Cenoman** » Sun Aug 09, 2020 9:52 pm

Code: Select all: +----------------------+-----------------+---------------------+ | 17 9 23 | 5 4 8 | 1237 123 6 | | 8 d3567 c356 | 9 2 1 | 347 35 45 | | 145 45 245 | 7 6 3 | 9 125 8 | +----------------------+-----------------+---------------------+ | 3 48 7 | 48 5 2 | 16 16 9 | | 9 1 b68 | 68 3 7 | 5 4 2 | | a46-5 2 b456 | 46 1 9 | 8 7 3 | +----------------------+-----------------+---------------------+ | f457 e3457 1 | 2 8 6 | 34 9 45 | | f56 3568 3568 | 1 9 4 | 236 2356 7 | | 2 f46 9 | 3 7 5 | 46 8 1 | +----------------------+-----------------+---------------------+

(6)r6c1 = r56c3 - r2c3 = (6-7)r2c2 = r7c2 - (7=465)b7p148 => -5 r6c1; ste

by **SteveG48** » Sun Aug 09, 2020 11:17 pm

Code: Select all: *-----------------------------------------------------------* | 17 9 d23 | 5 4 8 | 1237 123 6 | | 8 3567 d356 | 9 2 1 | 347 35 45 | | 145 c45 d245 | 7 6 3 | 9 125 8 | *-------------------+-------------------+-------------------| | 3 c48 7 | 48 5 2 | 16 16 9 | | 9 1 d68 | 68 3 7 | 5 4 2 | |a456 2 56-4 |a46 1 9 | 8 7 3 | *-------------------+-------------------+-------------------| | 457 3457 1 | 2 8 6 | 34 9 45 | |b56 3568 3568 | 1 9 4 | 236 2356 7 | | 2 c46 9 | 3 7 5 | 46 8 1 | *-----------------------------------------------------------*

(4=65)r6c14 - (5=6)r8c1 - (6=458)r349c2 - (5|8=2364)r1235c3 => -4 r6c3 ; stte

by **Ngisa** » Mon Aug 10, 2020 8:03 pm

Code: Select all: +----------------------+--------------+----------------------+ | 17 9 c23 | 5 4 8 |d1237 d123 6 | | 8 3567 c356 | 9 2 1 | 347 35 45 | | 145 b4+5 245 | 7 6 3 | 9 e125 8 | +----------------------+--------------+----------------------+ | 3 b48 7 | 48 5 2 |g16 f16 9 | | 9 1 b+68 | 68 3 7 | 5 4 2 | | 456 2 456 | 46 1 9 | 8 7 3 | +----------------------+--------------+----------------------+ | 457 3457 1 | 2 8 6 | 34 9 45 | | 56 3568 3568 | 1 9 4 | 236 2356 7 | | 2 ia6-4 9 | 3 7 5 |h46 8 1 | +----------------------+--------------+----------------------+

4r9c2 - (4=865)b4p26,r3c2 - (65=32)r21c3 - (2)r1c78 = (2-1)r3c8 = (1-6)r4c8 = r4c7 - r9c7 = (6)r9c2 => - 4r9c2; stte

Clement

August 9, 2020