The New Sudoku Players' Forum

by **SteveG48** » Tue Oct 25, 2022 4:14 pm

Code: Select all: *-----------* |5..|..3|.74| |...|..1|82.| |.21|...|...| |---+---+---| |.1.|..5|7..| |..3|.4.|5..| |..9|3..|.4.| |---+---+---| |...|...|98.| |.92|1..|...| |84.|6..|..5| *-----------*

by **Leren** » Tue Oct 25, 2022 8:30 pm

Code: Select all: *--------------------------------------------------------------------------------* | 5 68 68 | 29 29 3 | 1 7 4 | | 379 37 4 | 5 67 1 | 8 2 369 | | 379 2 1 | 478 678 467 | 36 5 369 | |--------------------------+--------------------------+--------------------------| | 4 1 68 | 289C 2689C 5 | 7 369 236B | | 267 678 3 | 2789 4 d2679D | 5 c69 1 | | 267 5 9 | 3 1 267 | 26 4 8 | |--------------------------+--------------------------+--------------------------| | 1 36 5 | 247 237 247bE | 9 8 a36-2aA | | 36 9 2 | 1 5 8 | 4 b36 7 | | 8 4 7 | 6 239 29 | 23 1 5 | *--------------------------------------------------------------------------------* Kraken ? Column 6 Digit 9: 2 r7c9 - 6 r7c9 = r8c8 - (6=9) r5c8 - 9 r5c6; 2 r7c9 - 2 r7c6; 2 r7c9 - r4c9 = r4c45 - r5c6 *= 2 r9c6 - 9 r9c6; => - 2 r7c9; stte

by **RSW** » Tue Oct 25, 2022 9:26 pm

Code: Select all: +------------+----------------+--------------+ | 5 68 68 |#29 #29 3 | 1 7 4 | | 379 37 4 | 5 67 1 | 8 2 369 | | 379 2 1 | 478 678 467 | 36 5 369 | +------------+----------------+--------------+ | 4 1 68 |#289 #2689 5 | 7 39-6 23-6 | | 267 678 3 | 2789 4 2679 | 5 69 1 | | 267 5 9 | 3 1 267 | 26 4 8 | +------------+----------------+--------------+ | 1 36 5 | 247 237 247 | 9 8 236 | | 36 9 2 | 1 5 8 | 4 36 7 | | 8 4 7 | 6 239 29 | 23 1 5 | +------------+----------------+--------------+

1. Unique Rectangle (29)r14c45 forms a locked set with 68r4c3 => -6r4c89

Code: Select all: +------------+----------------+------------+ | 5 68 68 | 29 29 3 | 1 7 4 | | 379 37 4 | 5 67 1 | 8 2 369 | | 379 2 1 | 478 678 467 | 36 5 369 | +------------+----------------+------------+ | 4 1 68 | 289 2689 5 | 7 39 23 | | 267 678 3 | 2789 4 2679 | 5 9-6 1 | | 267 5 9 | 3 1 267 |a26 4 8 | +------------+----------------+------------+ | 1 36 5 | 247 237 247 | 9 8 236 | | 36 9 2 | 1 5 8 | 4 c36 7 | | 8 4 7 | 6 239 29 |b23 1 5 | +------------+----------------+------------+

2. (6=2)r6c7 - (2=3)r9c7 - (3=6)r8c8 => -6r5c8; btte

by **P.O.** » Wed Oct 26, 2022 6:16 pm

basics:

Hidden Text: Show

Code: Select all: 239r9c5 => r7c9 <> 2 r9c5=2 - r1n2{c5 c4} - r4n2{c4 c9} r9c5=3 - r9c7{n3 n2} r9c5=9 - c6n9{r9 r5} - r5c8{n9 n6} - b9n6{r8c8 r7c9} ste. or: r9c5=2 - r1n2{c5 c4} - r4n2{c4 c9} r9c5=2 - b9n2{r9c7 r7c9} => r9c5 <> 2 r9c5=9 - c6n9{r9 r5} - r5c8{n9 n6} - b9n6{r8c8 r7c9} r9c5=9 - r9c6{n9 n2} - b9n2{r9c7 r7c9} => r9c5 <> 9 => r9c5 = 3 ste.

by **jco** » Wed Oct 26, 2022 10:50 pm

After basics

Code: Select all: .-----------------------------------------------------------. | 5 68 68 | 29 29 3 | 1 7 4 | | 379 37 4 | 5 67 1 | 8 2 369 | | 379 2 1 | 478 678 467 | 36 5 369 | |-------------------+-------------------+-------------------| | 4 1 68 | 289 2689 5 | 7 39-6 236 | | 267 678 3 | 2789 4 2679 | 5 9-6 1 | | 267 5 9 | 3 1 267 |a26 4 8 | |-------------------+-------------------+-------------------| | 1 36 5 | 247 237 247 | 9 8 236 | | 36 9 2 | 1 5 8 | 4 c36 7 | | 8 4 7 | 6 239 29 |b23 1 5 | '-----------------------------------------------------------'

1. Y-wing (6=2)r6c7 - (2=3)r9c7 - (3=6)r8c8 => -6 r45c8; basics
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Code: Select all: .--------------------------------------------------. | 5 8 6 | 29 29 3 | 1 7 4 | | 79 3 4 | 5 67 1 | 8 2 69 | | 79 2 1 | 47 8 46 |a36 5 b(6)39 | |----------------+----------------+----------------| | 4 1 8 | 29 c(2)69 5 | 7 3 26 | | 26 7 3 | 8 4 26 | 5 9 1 | | 26 5 9 | 3 1 7 | 26 4 8 | |----------------+----------------+----------------| | 1 6 5 | 47 c(2)37 24 | 9 8 23 | | 3 9 2 | 1 5 8 | 4 6 7 | | 8 4 7 | 6 d23 9 | 2-3 1 5 | '--------------------------------------------------'

(3=6)r3c7 - (6)r3c9 = BUG+3 = (2)r47c5 - (2=3)r9c5 => -3 r9c7; ste

by **Ngisa** » Thu Oct 27, 2022 4:27 pm

Two steps

Code: Select all: +------------------+----------------------+------------------+ | 5 68 68 | 29 29 3 | 1 7 4 | |b379 a37 4 | 5 67 1 | 8 2 bc369 | |b379 2 1 | 478 678 467 |d36 5 bc369 | +------------------+----------------------+------------------+ | 4 1 68 | 289 2689 5 | 7 f369 236 | | 267 678 3 | 2789 4 2679 | 5 f69 1 | | 267 5 9 | 3 1 267 |e26 4 8 | +------------------+----------------------+------------------+ | 1 6-3 5 | 247 237 247 | 9 8 236 | |h36 9 2 | 1 5 8 | 4 g36 7 | | 8 4 7 | 6 239 29 | 23 1 5 | +------------------+----------------------+------------------+

Step 1: (3=7)r2c2 - (7=Type 4 UR(93)r23c19) - (3)r23c9 = (3-6)r3c7 = r6c7 - r45c8 = r8c8 - (6=3)r8c1 => - 3r7c2

Code: Select all: +--------------+-----------------+----------------+ | 5 8 6 |a29 a29 3 | 1 7 4 | | 79 3 4 | 5 67 1 | 8 2 69 | | 79 2 1 | 47 8 46 | 36 5 369 | +--------------+-----------------+----------------+ | 4 1 8 |a29 a6-29 5 | 7 3 26 | | 26 7 3 | 8 4 26 | 5 9 1 | | 26 5 9 | 3 1 7 | 26 4 8 | +--------------+-----------------+----------------+ | 1 6 5 | 47 237 24 | 9 8 23 | | 3 9 2 | 1 5 8 | 4 6 7 | | 8 4 7 | 6 23 9 | 23 1 5 | +--------------+-----------------+----------------+

Step 2: Type 1 UR(29)r14c45 => - 29r4c5; stte

Clement

by **SteveG48** » Fri Oct 28, 2022 6:15 pm

Code: Select all: *------------------------------------------------------------* | 5 f68 68 | 29 29 3 | 1 7 4 | | 379 37 4 | 5 67 1 | 8 2 369 | | 379 2 1 | 478 678 c467 | b36 5 369 | *-------------------+-------------------+--------------------| | 4 1 68 | 289 2689 5 | 7 369 236 | | 267 f678 3 | 2789 4 2679 | 5 69 1 | |e267 5 9 | 3 1 d267 | 26 4 8 | *-------------------+-------------------+--------------------| | 1 f36 5 | 247 237 c247 | 9 8 b236 | |g36 9 2 | 1 5 8 | 4 h36 7 | | 8 4 7 | 6 239 29 |ab2-3 1 5 | *------------------------------------------------------------*

2r9c7 = ((36)r39c7)&(2r7c9) - (2|6=47)r37c6 - 7r6c6 = r1c6 - (7=683)r157c2 - 3r8c1 = 3r8c8 => -3 r9c6 ; stte

Steve Hodoku 10-25-2022