The New Sudoku Players' Forum

by **SteveG48** » Fri Jun 21, 2019 7:44 pm

The latest from our local newspaper:

Code: Select all: *-----------* |1..|3.7|...| |...|.42|...| |.46|.5.|...| |---+---+---| |9.4|2..|1..| |.5.|...|.7.| |..8|..1|6.2| |---+---+---| |.8.|...|43.| |...|73.|...| |...|6.4|..9| *-----------*

by **SpAce** » Fri Jun 21, 2019 10:00 pm

Code: Select all: .-------------------------.-----------.---------------------. | 1 29 e(5)9-2 | 3 6 7 | d58 89 4 | | a378-5 379 3579 | 18 4 2 | 357 169 56 | | b378 4 6 | 18 5 9 | b237 12 b17 | :-------------------------+-----------+---------------------: | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37 37 8 | 5 9 1 | 6 4 2 | :-------------------------+-----------+---------------------: | 6 8 ab[2]7 | 9 12 5 | 4 3 c17 | | 4 19-2 9-25 | 7 3 8 | e(2)5 e1(2)6 56 | | a3[5]7 1237 237-5 | 6 12 4 | d2578 d128 9 | '-------------------------'-----------'---------------------'

(58)r92c1&(2)r7c3 = (837)r3c179|(7)r7c3 - r7c9 = (78-2|5)r9c78,r1c7 = (2)r8c78&(5)r1c3 => -5 r2c1,r89c3, -2 r1c3,r8c23; stte

by **Cenoman** » Fri Jun 21, 2019 10:31 pm

Code: Select all: +-----------------------+-----------------+--------------------+ | 1 b29 259 | 3 6 7 | 58 89 4 | | 3578 a379* 3579 | 18 4 2 | 357* b'169 56 | | A378* 4 6 | B18 5 9 | 237* b'12 z7-1 | +-----------------------+-----------------+--------------------+ | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37* 37* 8 | 5 9 1 | 6 4 2 | +-----------------------+-----------------+--------------------+ | 6 8 27 | 9 e12 5 | 4 3 f17 | | 4 b129 259 | 7 3 8 | 25 b'126 56 | | 357 c1237 2357 | 6 d12 4 | 2578 c'128 9 | +-----------------------+-----------------+--------------------+

DP(37)r6c12, b1p57, r23c7 using mixed internals-external

Code: Select all: (92=1)r18c2 - - (1)r9c2 / b c \\ (9)r2c2 (1)r9c5 - r7c5 = (1)r7c9 || a \ b' c' // d e f || (926=1)r238c8 - (1)r9c8 || (8)r3c1 - (8=1)r3c4 || A B (7)r3c9 z => -1 r3c9; ste

TM 6x6

Hidden Text: Show

by **eleven** » Fri Jun 21, 2019 10:33 pm

Either the puzzle creator of that newspaper has a bad program and can't solve himself, or he is an expert.

2-stepper.

Code: Select all: *------------------------------------------------------------* | 1 a29 a5-29 | 3 6 7 | b58 b89 4 | | 3578 379 3579 | 18 4 2 | 357 169 56 | | 378 4 6 | 18 5 9 | 237 12 17 | |-----------------------+---------------+--------------------| | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37 37 8 | 5 9 1 | 6 4 2 | |-----------------------+---------------+--------------------| | 6 8 e27 | 9 12 5 | 4 3 d17 | | 4 129 e259 | 7 3 8 | c25 c126 d56 | | 357 1237 2357 | 6 12 4 | 2578 c128 9 | *------------------------------------------------------------*

(5=29)r1c23 - (9=58)r1c78 - (5|8=216)b9p685 - (1|6=75)r78c9 - (7|5=29)r78c3 => -29r1c3

Solves with xy-wing.

by **Leren** » Fri Jun 21, 2019 10:50 pm

I'll do a sensible three step solution.

Code: Select all: *------------------------------------------* | 1 29 259 | 3 6 7 | 58 89 4 | |*3578 379 3579 | 18 4 2 | 357 169 *56 | | 378 4 6 | 18 5 9 | 237 12 17 | |----------------+---------+---------------| | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37 37 8 | 5 9 1 | 6 4 2 | |----------------+---------+---------------| | 6 8 27 | 9 12 5 | 4 3 17 | | 4 129 29-5 | 7 3 8 | 25 126 *56 | |*357 1237 2357 | 6 12 4 | 278-5 128 9 | *------------------------------------------*

Skyscraper : (5) r9c1 = r2c1 - r2c9 = (5) r8c9 => - 5 r8c3, r9c7

Code: Select all: *-------------------------------------------* | 1 29 259 | 3 6 7 | 58 89 4 | | 3578 379 3579 | 18 4 2 | 357 169 56 | | 378 4 6 | 18 5 9 | 237 12 17 | |-------------------+----------+------------| | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37 37 8 | 5 9 1 | 6 4 2 | |-------------------+----------+------------| | 6 8 c27 | 9 b12 5 | 4 3 17 | | 4 d129 d29 | 7 3 8 | 25 126 56 | | 357 237-1 2357 | 6 a12 4 | 278 128 9 | *-------------------------------------------*

(1=2) r9c5 - r7c5 = r7c3 - (2=1) r8c23 = > - 1 r8c2

Code: Select all: *------------------------------------------* | 1 b29 25 | 3 6 7 | 58 c89 4 | | 3578 379 357 | 18 4 2 | 357 169 56 | | 378 4 6 | 18 5 9 | 237 12 17 | |----------------+-----------+-------------| | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37 37 8 | 5 9 1 | 6 4 2 | |----------------+-----------+-------------| | 6 8 27 | 9 12 5 | 4 3 17 | | 4 1 9 | 7 3 8 | 25 26 56 | | 357 a237 2357 | 6 e1-2 4 | 78 d18 9 | *------------------------------------------*

(2) r9c2 = (2-9) r1c2 = (9-8) r1c8 = (8-1) r9c8 = (1) r9c5 => - 2 r9c5; stte

Hodoku used the Skyscraper and four XY Chains of length 4. Tough nut for a newspaper. Leren

by **SteveG48** » Sat Jun 22, 2019 12:40 am

eleven wrote:Either the puzzle creator of that newspaper has a bad program and can't solve himself, or he is an expert.

I suspect he's an expert. The puzzles get progressively more difficult from Monday through Friday. Sometimes the Friday puzzles aren't too bad, but sometimes they're like today's. Lack of consistency suggests a manual component.

by **SpAce** » Sat Jun 22, 2019 2:14 am

eleven wrote:(5=29)r1c23 - (9=58)r1c78 - (5|8=216)b9p685 - (1|6=75)r78c9 - (7|5=29)r78c3 => -29r1c3

That's a beautiful chain!

Solves with xy-wing.

Or W-Wing which some might find even easier to spot.

by **Ngisa** » Sat Jun 22, 2019 5:35 pm

I have to settle with two steps

Code: Select all: +----------------------+---------------+---------------------+ | 1 29 259 | 3 6 7 | 58 d9-8 4 | | 3578 b379 3579 | 18 4 2 | 357 c169 56 | | 378 4 6 | 18 5 9 | 237 12 17 | +----------------------+---------------+---------------------+ | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37 b37 8 | 5 9 1 | 6 4 2 | +----------------------+---------------+---------------------+ | 6 8 27 | 9 12 5 | 4 3 17 | | 4 129 259 | 7 3 8 | 25 126 56 | | 357 b1237 2357 | 6 a12 4 | 2578 a128 9 | +----------------------+---------------+---------------------+

Step 1: (8=12)r9c58 - (12=379)r269c2 - (9)r2c8 = (9)r1c8 => - 8r1c8

Code: Select all: +---------------------+-----------------+--------------------+ | 1 2 5 | 3 6 7 | 8 9 4 | | 378 379 379 | 18 4 2 | 357 16 56 | | 378 4 6 | 18 5 9 | 237 12 17 | +---------------------+-----------------+--------------------+ | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | | 37 37 8 | 5 9 1 | 6 4 2 | +---------------------+-----------------+--------------------+ | 6 8 27 | 9 2-1 5 | 4 3 a17 | | 4 19 29 | 7 3 8 | 25 126 56 | | 5 137 237 | 6 c12 4 | b27 8 9 | +---------------------+-----------------+--------------------+

Step 2 XY-Wing: (1=7)r7c9 - (7=2)r9c7 - (2=1)r9c5 => - 1r7c5; stte

Clement

by **blue** » Sat Jun 22, 2019 7:24 pm

Code: Select all: +--------------------+-----------+----------------+ | 1 29 259e | 3 6 7 | 58 89 4 | | 3578 379 *37+59e| 18 4 2 |*357 169 56 | |*37+8b 4 6 | 18c 5 9 |*237 12 1#7d| +--------------------+-----------+----------------+ | 9 6 4 | 2 7 3 | 1 5 8 | | 2 5 1 | 4 8 6 | 9 7 3 | |*37a *37 8 | 5 9 1 | 6 4 2 | +--------------------+-----------+----------------+ | 6 8 2#7f | 9 12 5 | 4 3 1-7 | | 4 129 259e | 7 3 8 | 25 126 56 | | 5#37a *1237 *2357 | 6 12 4 | 2578 128 9 | +--------------------+-----------+----------------+

Bug-Lite+7: <37> in * cells => -7r7c9; stte

Code: Select all: 37r69c1a - (3|7=8b)r3c1 - (8=1)r3c4c - (1=7d)r3c9 || / 8r3c1b -------------- || 259r128c3e - (2=7f)r7c3 || 7r3c9d || 7r7c3f

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