The New Sudoku Players' Forum

by **P.O.** » Thu Mar 09, 2023 6:31 pm

Code: Select all: 2 8 5 6 . . . . . 4 7 3 . . 5 . . . 6 9 1 . 4 . . . . 1 2 4 . . . . . . 3 6 7 . . . . 8 . 8 5 9 . . . 7 . . 5 4 6 2 1 3 9 7 8 7 1 8 9 6 4 2 5 3 9 3 2 5 7 8 4 6 1 2856.....473..5...691.4....124......367....8.859...7..546213978718964253932578461 2 8 5 6 39 179 13 1349 479 4 7 3 18 289 5 168 129 269 6 9 1 378 4 27 358 23 257 1 2 4 378 3589 679 356 39 569 3 6 7 14 259 129 15 8 2459 8 5 9 134 23 126 7 1234 246 5 4 6 2 1 3 9 7 8 7 1 8 9 6 4 2 5 3 9 3 2 5 7 8 4 6 1

by **Leren** » Thu Mar 09, 2023 8:06 pm

Code: Select all: *------------------------------------------------* | 2 8 5 | 6 39 179D | 13 1349F 479E | | 4 7 3 | 18 289d 5 | 168 129c 269c | | 6 9 1 |Aa78-3aA 4 27C | 358 B23bB 257 | |-------+--------------------+-------------------| | 1 2 4 | b378 c3589 679 | 356 39 569 | | 3 6 7 | 14 d259 129 |e15 8 2459 | | 8 5 9 | 134 23e 126 | 7 Cf1234fG 246 | |-------+--------------------+-------------------| | 5 4 6 | 2 1 3 | 9 7 8 | | 7 1 8 | 9 6 4 | 2 5 3 | | 9 3 2 | 5 7 8 | 4 6 1 | *------------------------------------------------* Kraken Cell r6c8: 3 r3c4 - 7 r3c4 = (7-8) r4c4 = (8-5) r4c5 = r5c5 - (5=1) r5c7 - 1 r6c8; 3 r3c4 - (3=2) r3c8 - 2 r6c8; 3 r3c4 - (3=2) r3c8 - r2c89 = r2c5 - (2=3) r6c5 - 3 r6c8; 3 r3c4 - (3=2) r3c8 - (2=7) r3c6 - r1c6 = (7-4) r1c9 = r1c8 - 4 r6c8 => - 3 r3c4; stte

Leren

by **SteveG48** » Thu Mar 09, 2023 9:15 pm

Essentially the same as Leren's, but a little different.

Code: Select all: *-------------------------------------------------------------* | 2 8 5 | 6 b39 h79-1 |ah13 g1349 h479 | | 4 7 3 | 18 d289 5 | 168 129 269 | | 6 9 1 | 378 4 c27 | 358 bgh23 257 | *-------------------+-------------------+---------------------| | 1 2 4 | 378 3589 679 | 356 39 569 | | 3 6 7 | 14 cd259 129 | e15 8 2459 | | 8 5 9 | 134 e23 126 | 7 f1234 246 | *-------------------+-------------------+---------------------| | 5 4 6 | 2 1 3 | 9 7 8 | | 7 1 8 | 9 6 4 | 2 5 3 | | 9 3 2 | 5 7 8 | 4 6 1 | *-------------------------------------------------------------*

by **Cenoman** » Thu Mar 09, 2023 10:28 pm

Two steps:

Code: Select all: +-----------------+---------------------+----------------------+ | 2 8 5 | 6 b39 179 | c13 1349 479 | | 4 7 3 | 18 g289 5 | 168 129 269 | | 6 9 1 | a37-8 4 27 | 358 23 257 | +-----------------+---------------------+----------------------+ | 1 2 4 | 378 f3589 679 | 356 39 569 | | 3 6 7 | 14 e259 129 | d15 8 2459 | | 8 5 9 | 134 23 126 | 7 1234 246 | +-----------------+---------------------+----------------------+ | 5 4 6 | 2 1 3 | 9 7 8 | | 7 1 8 | 9 6 4 | 2 5 3 | | 9 3 2 | 5 7 8 | 4 6 1 | +-----------------+---------------------+----------------------+

1. (3)r3c4 = r1c5 - (3=1)r1c7 - (1=5)r5c7 - r5c5 = (5-8)r4c5 = (8)r2c5 => -8 r3c4; 4 placements

Code: Select all: +-----------------+---------------------+--------------------+ | 2 8 5 | 6 39 19 | 13 4 7 | | 4 7 3 | 18 289 5 | 16 129 269 | | 6 9 1 | 37 4 27 | 8 23 5 | +-----------------+---------------------+--------------------+ | 1 2 4 | 378 3589 679 | 356 39 69 | | 3 6 7 | 14 259 129 | 15 8 249 | | 8 5 9 | 134 23 126 | 7 123 246 | +-----------------+---------------------+--------------------+ | 5 4 6 | 2 1 3 | 9 7 8 | | 7 1 8 | 9 6 4 | 2 5 3 | | 9 3 2 | 5 7 8 | 4 6 1 | +-----------------+---------------------+--------------------+

2. W-Wing: (2=3)r6c5 - r1c5 = r1c7 - (3=2)r3c8 => -2 r6c8; lclste

by **P.O.** » Fri Mar 10, 2023 6:31 pm

thank you for your answers, my solution is the same as Leren but from another start:

Code: Select all: 2r3c8 => r6c8 <> 1,2,3,4 r3c8=2 - b2n2{r3c6 r2c5} - c5n8{r2 r4} - c5n5{r4 r5} - r5c7{n5 n1} r3c8=2 r3c8=2 - b2n2{r3c6 r2c5} - r6c5{n2 n3} r2c8=2 - r3c6{n2 n7} - r1n7{c6 c9} - r1n4{c9 c8} => r3c8 <> 2 ste.

by **jco** » Sat Mar 11, 2023 2:41 pm

Late. Two steps.

Code: Select all: .-----------------------------------------------------------. | 2 8 5 | 6 39 179 |a13 1349 479 | | 4 7 3 | 18 289 5 | 168 129 269 | | 6 9 1 | 378 4 c27 | 38-5 c23 c257 | |-------------------+-------------------+-------------------| | 1 2 4 | 378 3589 679 | 356 39 69-5 | | 3 6 7 | 14 259 129 |a15 8 249-5 | | 8 5 9 | 134 23 126 | 7 1234 246 | |-------------------+-------------------+-------------------| | 5 4 6 | 2 1 3 | 9 7 8 | | 7 1 8 | 9 6 4 | 2 5 3 | | 9 3 2 | 5 7 8 | 4 6 1 | '-----------------------------------------------------------'

1.(5=13)r15c7 - (3=275)r3c689 => -5 r3c7, -5 r45c9 [3 placements and LC]
-----

Code: Select all: .-------------------------------------------------------------. | 2 8 5 | 6 39 19 |ga13* 4 7 | | 4 7 3 | 18 d28 5 | 168 129 269 | | 6 9 1 | 378 4 e27 | 38 fa23* 5 | |-------------------+-------------------+---------------------| | 1 2 4 | 378 3589 679 | 356 39 69 | | 3 6 7 | 14 259 129 | 5-1 8 249 | | 8 5 9 | 134 c23 126 | 7 ba12(3)* 246 | |-------------------+-------------------+---------------------| | 5 4 6 | 2 1 3 | 9 7 8 | | 7 1 8 | 9 6 4 | 2 5 3 | | 9 3 2 | 5 7 8 | 4 6 1 | '-------------------------------------------------------------'

2. Almost Y-wing (123)r1c7, r36c8

Y-wing* = (3*)r7c8 - (3=2)r6c5 - r2c5 = r3c6 - (2=3)r3c8 - (3=1)r1c7 => -1 r5c7; ste

Puzzle 109