The New Sudoku Players' Forum

by **mith** » Sun Sep 06, 2020 3:32 pm

An easier one today...

Code: Select all: +-------+-------+-------+ | . . . | . 3 . | 1 . . | | . . . | . 4 1 | . 5 . | | . 9 2 | . . . | . . . | +-------+-------+-------+ | . . . | . . . | . 6 5 | | . 3 . | . 5 . | . 8 . | | 9 7 . | . . . | . . . | +-------+-------+-------+ | . . . | . . . | 9 3 . | | . 2 . | 3 8 . | . . . | | . . 4 | . 6 . | . . . | +-------+-------+-------+ ....3.1......41.5..92.............65.3..5..8.97.............93..2.38......4.6....

And a harder one as a bonus...

Code: Select all: +-------+-------+-------+ | . . 3 | 1 . . | . . . | | 4 1 . | . . . | . . . | | . . . | 5 . 9 | . . 2 | +-------+-------+-------+ | . 6 5 | . . . | 3 . . | | . . . | . 5 . | . . . | | . . 8 | . . . | 9 7 . | +-------+-------+-------+ | 9 . . | 3 . 2 | . . . | | . . . | . . . | . 3 8 | | . . . | . . 4 | 6 . . | +-------+-------+-------+ ..31.....41..........5.9..2.65...3......5......8...97.9..3.2..........38.....46..

by **pjb** » Sun Sep 06, 2020 11:22 pm

Code: Select all: 45 45 68 | 268 3 268 | 1 9 7 7 b68 3 | 9 4 1 |a68 5 2 1 9 2 | 568 7 568 | 368 4 3-6 ------------------------+----------------------+--------------------- 2 48 18 | 14 9 3 | 7 6 5 46 3 16 | 14 5 7 | 2 8 9 9 7 5 | 68 2 68 | 34 1 34 ------------------------+----------------------+--------------------- 8 c56 7 | 25 1 245 | 9 3 d46 56 2 9 | 3 8 45 | 4-6 7 1 3 1 4 | 7 6 9 | 5 2 8

From one end of difficulty to the other: (6)r2c7 = (6)r2c2 - (6)r7c2 = (6)r7c9 => -6 r3c9, r8c7; stte
Making slow progress on second
Phil

by **Sudtyro2** » Mon Sep 07, 2020 1:27 pm

Yes, the easy one first...

Code: Select all: +--------------+---------------+----------------+ | 45 45 68 | 268 3 268 | 1 9 7 | | 7 *68 3 | 9 4 1 | *8-6 5 2 | | 1 9 2 | 58-6 7 58-6 | #368 4 *3-6 | +--------------+---------------+----------------+ | 2 48 18 | 14 9 3 | 7 6 5 | | 46 3 16 | 14 5 7 | 2 8 9 | | 9 7 5 | 68 2 68 | 34 1 34 | +--------------+---------------+----------------+ | 8 *56 7 | 25 1 245 | 34 3 *46 | | 56 2 9 | 3 8 45 | 4-6 7 1 | | 3 1 4 | 7 6 9 | 5 2 8 | +--------------+---------------+----------------+

In 6s, a 5-link oddagon(*) with only one guardian(#) => -6 r28c7,r3c469; stte

SteveC

by **Cenoman** » Mon Sep 07, 2020 9:53 pm

Hard to find a different solution to the first puzzle. Just for fun:

Code: Select all: +-------------------+-------------------+--------------------+ | 45 45 Bb68 | a26+8 3 A28+6 | 1 9 7 | | 7 YxCc68 3 | 9 4 1 | Zwd68 5 2 | | 1 9 2 | 58+6 7 u56+8 | v38+6 4 3-6 | +-------------------+-------------------+--------------------+ | 2 48 18 | 14 9 3 | 7 6 5 | | 46 3 16 | 14 5 7 | 2 8 9 | | 9 7 5 | 68 2 68 | 34 1 34 | +-------------------+-------------------+--------------------+ | 8 XyD56 7 | 25 1 W24+5 | 9 3 zE46 | | 56 2 9 | 3 8 45 | 46 7 1 | | 3 1 4 | 7 6 9 | 5 2 8 | +-------------------+-------------------+--------------------+

BUG+6
(8)r1c4 - r1c3 = r2c2 - (8=6)r2c7
(6)r1c6 - r1c3 = r2c2 - r7c2 = (6)r7c9
(6)r3c47 (untagged)
(8)r3c6 - r3c7 = (8-6)r2c7 = r2c2 - r7c2 = (6)r7c9
(5)r7c6 - (5=6)r7c2 - r2c2 = (6)r2c7
=> -6 r3c9; ste

Second puzzle,
solved with two AIC's (three subchains being used in the second)

Code: Select all: +-----------------------+------------------------+-----------------------+ | 25 25 3 | 1 4 k678 | 78 689 679 | | 4 1 9 | a2678 b2678 k678 | 578 568 3 | | g678 h78 67 | 5 3 9 | 14 14 2 | +-----------------------+------------------------+-----------------------+ | 127 6 5 | 24789 2789 178 | 3 1248 14 | | 1237 9 147-2 | 2478 5 1378 | D1248 12468 146 | | j123 j234 8 | 246 c26 j136 | 9 7 5 | +-----------------------+------------------------+-----------------------+ | 9 58 1467 | 3 d1678 2 | 1457 145 147 | | f1267 i247 12467 | e679 d1679 5 | C1247 3 8 | | 358 358 A127 | 78 178 4 | 6 B1259 179 | +-----------------------+------------------------+-----------------------+

1. Kite (2)r9c3 = r9c8 - r8c7 = r5c7 => -2 r5c3
2. *(2)r2c4 = r2c5 - (2^=6)r6c5 - #(6)r78c5 = (6)r8c4* - r8c1 = (6-8)r3c1 = (8-7)r3c2 = (7-4)r8c2 = (413^-6)r6c126 = (6)r12c6#
=> -6r2c4 (*, a to e), -6r2c5 (#, d to k), -2 r6c12 (^, c to j); lclste

by **mith** » Tue Sep 08, 2020 6:26 pm

Way fewer steps than anything I was going to come up with.

(It's an SE 8.2; the only symmetrical 21 digit pi puzzle of this style with ER>7.2.)

by **Sudtyro2** » Thu Sep 10, 2020 9:13 pm

Just for fun on the second puzzle, a possible 3-step stte solution from an old P&P solver...

Step 1. Cenoman's Kite => -2 r5c3.
Step 2. Basic Box-Line Reduction (2)b7c3 => -2 b7p45.

Code: Select all: +------------------+------------------+-----------------+ | 25 25 3 | 1 4 678 | 78 689 679 | | 4 1 9 | 2678 2678 678 | 578 568 3 | | 67-8* 78 67 | 5 3 9 | 14 14 2 | +------------------+------------------+-----------------+ | 127 6 5 | 24789 2789 178 | 3 1248 14 | | 1237 9 147-2 | 2478 5 1378 | 1248 12468 146 | | 123 234 8 | 246 26 136 | 9 7 5 | +------------------+------------------+-----------------+ | 9 58 1467 | 3 1678 2 | 1457 145 147 | | 167-2 47-2 12467 | 679 1679 5 | 1247 3 8 | | 358 358 127 | 78 178 4 | 6 1259 179 | +------------------+------------------+-----------------+

Step 3. Apply multi-coloring (sorry, no tags) to Kraken (6)b2 in the remaining grid to form a network targeting -8r3c1(*); stte

Code: Select all: 4r6c2 - (4=7)r8c2 - (7=8)r3c2 -8r3c1 3r6c6 -------\ || || \ || || 3r6c1 - 3r6c2 || || || 1r6c6 - 1r6c1 2r6c2 - (2=6)r6c5 - r7c5 = r7c3 - r3c3 = 6r3c1 -8r3c1 || || / / 6r12c6 - 6r6c6 2r6c1 ------/ / || / / 6r2c4 - 2r2c4 = 2r456c4 --/ / || / 6r2c5 ------------------------------/

[Edited 9/16/20 to correct the target elimination]

SteveC

The New Sudoku Players' Forum

Less Pi 2/3

Less Pi 2/3

Re: Less Pi 2/3

Re: Less Pi 2/3

Re: Less Pi 2/3

Re: Less Pi 2/3

Re: Less Pi 2/3