The New Sudoku Players' Forum

by **P.O.** » Sun Jan 08, 2023 9:29 am

Code: Select all: 9 5 7 . . . . . 3 4 3 1 9 . . 2 . 8 2 8 6 . 4 . . 9 5 8 2 5 . . . . 3 4 6 9 3 8 . 4 . . 1 7 1 4 . 3 . . . 9 5 6 9 4 . . . . 2 1 7 8 . . 2 . . 6 3 4 2 . 1 . . . 7 957.....34319..2.8286.4..95825....346938.4..1714.3...95694....2178..2..6342.1...7 9 5 7 126 268 168 146 146 3 4 3 1 9 567 567 2 67 8 2 8 6 137 4 137 17 9 5 8 2 5 167 679 1679 67 3 4 6 9 3 8 257 4 57 257 1 7 1 4 256 3 56 568 2568 9 5 6 9 4 78 378 138 18 2 1 7 8 35 59 2 3459 45 6 3 4 2 56 1 5689 589 58 7

by **SteveG48** » Sun Jan 08, 2023 2:01 pm

Code: Select all: *------------------------------------------------------------* | 9 5 7 | h126 268 168 | 146 d146 3 | | 4 3 1 | 9 567 567 | 2 d67 8 | | 2 8 6 | f137 4 137 |e17 9 5 | *-------------------+--------------------+-------------------| | 8 2 5 | g167 bj679 ak679-1 | 67 3 4 | | 6 9 3 | 8 257 4 | 57 257 1 | | 7 1 4 | h256 3 56 | 568 2568 9 | *-------------------+--------------------+-------------------| | 5 6 9 | 4 c78 c378 | 138 d18 2 | | 1 7 8 |ch35 bi59 2 | 3459 c45 6 | | 3 4 2 | 56 1 5689 | 589 58 7 | *------------------------------------------------------------*

[9r4c6 = (95)r48c5 - (5=3784)b8p234,r8c8 - (8|4=167)r128c8 - (7=1)r3c7 - r3c4 = 1r4c4] = (125)r168c4 - (5=9)r8c5 - r4c5 = 9r4c6 => -1 r4c6 ; stte

by **jco** » Sun Jan 08, 2023 3:40 pm

Two steps.

Code: Select all: .-----------------------------------------------------------. | 9 5 7 |a2-16 268 168 | 146 146 3 | | 4 3 1 | 9 g567 g567 | 2 67 8 | | 2 8 6 |f137 4 137 | 17 9 5 | |-------------------+-------------------+-------------------| | 8 2 5 |e167 d679 e1679 | 67 3 4 | | 6 9 3 | 8 257 4 | 57 257 1 | | 7 1 4 |b256 3 56 | 568 2568 9 | |-------------------+-------------------+-------------------| | 5 6 9 | 4 78 378 | 138 18 2 | | 1 7 8 | 35 c59 2 | 3459 45 6 | | 3 4 2 |b56 1 5689 | 589 58 7 | '-----------------------------------------------------------'

1. (2)r1c4 = (25)r69c4 - (5=9)r8c5 - (9)r4c5 = (91*-7)r4c46 = (7)r3c4 - (7=56)r2c56

=> -1*6 r1c4 [10 placements and basics]
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Code: Select all: .--------------------------------------------------. | 9 5 7 | 2 68 *18 | 14 46 3 | | 4 3 1 | 9 567 5-7 | 2 67 8 | | 2 8 6 |*17 4 3 | 17 9 5 | |----------------+----------------+----------------| | 8 2 5 | 17 79 179 | 6 3 4 | | 6 9 3 | 8 2 4 | 57 57 1 | | 7 1 4 | 56 3 56 | 8 2 9 | |----------------+----------------+----------------| | 5 6 9 | 4 78 *78 | 3 1 2 | | 1 7 8 | 3 59 2 | 459 45 6 | | 3 4 2 | 56 1 569 | 59 8 7 | '--------------------------------------------------'

2. Y-wing (7=8)r7c6 - (8=1)r1c6 - (1=7)r3c4 => -7 r2c6; ste

by **Cenoman** » Sun Jan 08, 2023 9:04 pm

Other two steps:

Code: Select all: +-----------------+---------------------+---------------------+ | 9 5 7 | 126 268 168 | 146 146 3 | | 4 3 1 | 9 567 567 | 2 67 8 | | 2 8 6 | a137 4 137 | 1-7 9 5 | +-----------------+---------------------+---------------------+ | 8 2 5 | b167 679 b1679 | d67 3 4 | | 6 9 3 | 8 257 4 | d57 257 1 | | 7 1 4 | 256 3 56 | d568 2568 9 | +-----------------+---------------------+---------------------+ | 5 6 9 | 4 78 378 | 138 18 2 | | 1 7 8 | 35 59 2 | 3459 45 6 | | 3 4 2 | 56 1 c5689 | d589 58 7 | +-----------------+---------------------+---------------------+

1. (7)r3c4 = (71-9)r4c46 = r9c6-(9=5687)r4569c7 =>-7r3c7; lcls, 7 placements

Code: Select all: +-----------------+-------------------+-------------------+ | 9 5 7 | 12 28 18 | 4 6 3 | | 4 3 1 | 9 56 56 | 2 7 8 | | 2 8 6 | 37 4 37 | 1 9 5 | +-----------------+-------------------+-------------------+ | 8 2 5 | a17 69-7 a179 | 67 3 4 | | 6 9 3 | 8 25-7 4 | 57 25 1 | | 7 1 4 | 25 3 56 | 568 258 9 | +-----------------+-------------------+-------------------+ | 5 6 9 | 4 c78 378 | 38 1 2 | | 1 7 8 | 35 59 2 | 39 4 6 | | 3 4 2 | 6 1 b89 | 589 58 7 | +-----------------+-------------------+-------------------+

2. (7=19)r4c46 - (9=8)r9c6 - (8=7)r7c5 => -7 r45c5; ste

by **P.O.** » Tue Jan 10, 2023 6:30 pm

thank you for your answers, my solution:

Code: Select all: 8r179c6 => r4c6 <> 9 r1c6=8 - c5n8{r1 r7} - r7c8{n8 n1} - r7c7{n18 n3} - c6n3{r7 r3} - c6n1{r3 r4} r79c6=8 - r7c5{n8 n7} - b5n7{r45c5 r4c46} - r4c7{n7 n6} - r4c5{n67 n9} ste.

Puzzle 86