The New Sudoku Players' Forum

by **Yogi** » Sun Oct 18, 2020 6:42 am

030050160000200040080000000010000700600400000000800000200010000400000008000000300

: 17Oct20.png (8.27 KiB) Viewed 518 times

by **SpAce** » Sun Oct 18, 2020 1:55 pm

Code: Select all: .---------------.----------------.--------------. | 79 3 4 | 79 5 8 | 1 6 2 | | 1 579 6 | 2 379 379 | 8 4 579 | | 579 8 2 | 1 4 6 | 59 579 3 | :---------------+----------------+--------------: | 8 1 59 | 59 6 2 | 7 3 4 | | 6 2 579 | 4 379 3579 | 59 8 1 | | 3 4 579 | 8 79 1 | 2 59 6 | :---------------+----------------+--------------: | 2 6 8 | 3 1 579 | 4 579 579 | | 4 579 3 | 579 2 579 | 6 1 8 | | 579 579 1 | 6 8 4 | 3 2 579 | '---------------'----------------'--------------'

1. Replace '579' with 'abc':

Code: Select all: .---------------.-----------------.---------------. | abc 3 4 | abc 5 8 | 1 6 2 | | 1 abc 6 | 2 3abc 3abc | 8 4 abc | | abc 8 2 | 1 4 6 | abc abc 3 | :---------------+-----------------+---------------: | 8 1 abc | abc 6 2 | 7 3 4 | | 6 2 abc | 4 3abc 3abc | abc 8 1 | | 3 4 abc | 8 abc 1 | 2 abc 6 | :---------------+-----------------+---------------: | 2 6 8 | 3 1 abc | 4 abc abc | | 4 abc 3 | abc 2 abc | 6 1 8 | | abc abc 1 | 6 8 4 | 3 2 abc | '---------------'-----------------'---------------'

2. Assign b7p578 = (a,b,c) and solve singles:

Code: Select all: a ≠ 5 .----------------.-------------------.--------------. | ^a 3 4 | bc 5* 8 | 1 6 2 | | 1 ^b 6 | 2 ^a ^3 | 8 4 ^c | | ^c 8 2 | 1 4 6 | ab ab 3 | :----------------+-------------------+--------------: | 8 1 bc | ^a 6 2 | 7* 3 4 | a ≠ 7 | 6 2 abc | 4 ^3 bc | abc 8 1 | | 3 4 abc | 8 bc 1 | 2 ab 6 | :----------------+-------------------+--------------: | 2 6 8 | 3 1 ^a | 4 ^c ^b | | 4 *a 3 | bc 2 bc | 6 1 8 | | *b *c 1 | 6 8 4 | 3 2 ^a | '----------------'-------------------'--------------'

a≠(5|7) => a=9 => +9 r1c1, r2c5, r4c4, r7c6, r8c2, r9c9; +3 r2c6,r5c5; stte

by **Cenoman** » Sun Oct 18, 2020 5:23 pm

Two steps:

Code: Select all: +--------------------+---------------------+-------------------+ | A79 3 4 | B79 5 8 | 1 6 2 | | 1 c579 6 | 2 379 379 | 8 4 d579 | | K579 8 2 | 1 4 6 | 59 L579 3 | +--------------------+---------------------+-------------------+ | 8 1 59 | 59 6 2 | 7 3 4 | | 6 2 579 | 4 379 3579 | 59 8 1 | | 3 4 579 | 8 79 1 | 2 59 6 | +--------------------+---------------------+-------------------+ | 2 6 8 | 3 1 9-57 | 4 ZMf579 Zf579 | | 4 b579 3 |Ca579 2 a579 | 6 1 8 | | X579 579 1 | 6 8 4 | 3 2 Ye579 | +--------------------+---------------------+-------------------+

1. (5)r8c46 = r8c2 - r2c2 = r2c9 - r9c9 = r7c89 => -5 r7c6;
2. Kraken column (7)r139c1
(7)r1c1 - r1c4 = r8c4
(7)r3c1 - r3c8 = r7c8
(7)r9c1 - r9c9 = r7c89
=> -7 r7c6; ste

by **Mauriès Robert** » Sun Oct 18, 2020 9:19 pm

Hi all,
A Kraken on 7B1 but using an intermediate UR.

Code: Select all: 7r2c2->(7r9c1 and 5r2c9)->9r9c9 7r3c1->(5r9c1 and 7r2c9)->9r9c9 ----------------------- / \ 7r1c1->(9r1c4->5r4c4->7r8c4)-->7r9c2----------------->9r9c9 \ \ / \ ->39r5c56*->5r5c7->5r2c9 \ / ->7r3c8 ----------------------------- * To avoid UR(37r25c56)

So r9c9=9, stte
Robert

by **pjb** » Mon Oct 19, 2020 1:43 am

A good one for "pattern overlay method":

No pattern of 5 includes r7c6, r8c2, r9c9 => -5 r7c6, r8c2, r9c9

No pattern of 7 includes r7c6, r8c2, r9c9=> -7 r7c6, r8c2, r9c9; stte

Phil

by **Leren** » Mon Oct 19, 2020 5:07 am

Code: Select all: *--------------------------------------------* | 79 3 4 | 79 5 8 | 1 6 2 | | 1 *579 6 | 2 379 379 | 8 4 *579 | | 579 8 2 | 1 4 6 | 59 579 3 | |--------------+--------------+--------------| | 8 1 59 | 59 6 2 | 7 3 4 | | 6 2 579 | 4 379 3579 | 59 8 1 | | 3 4 579 | 8 79 1 | 2 59 6 | |--------------+--------------+--------------| | 2 6 8 | 3 1 579 | 4 579 579 | | 4 *579 3 | 579 2 579 | 6 1 8 | |*579 *579 1 | 6 8 4 | 3 2 79-5 | *--------------------------------------------*

1. Empty Rectangle (5) Row 2, Box 7 => - 5 r9c9; basics

Code: Select all: *-----------------------------------------------* |*79 3 4 | #79 5 8 | 1 6 2 | | 1 ef579 6 | 2 f379 f379 | 8 4 579 | |*579 8 2 | 1 4 6 | 59 579 3 | |---------------+-----------------+-------------| | 8 1 59 | 59 6 2 | 7 3 4 | | 6 2 579 | 4 379 3579 | 59 8 1 | | 3 4 579 | 8 79 1 | 2 59 6 | |---------------+-----------------+-------------| | 2 6 8 | 3 1 79 | 4 579 579 | | 4 9-7 3 |tf579 2 579 | 6 1 8 | |*579 *579 1 | 6 8 4 | 3 2 *79 | *-----------------------------------------------*

2. Finned Franken Swordfish in 7's r29b1 c129 with endofin Cell r2c2. Fin cells r2c5 & r2c6 transported to r8c4 => - 7 r8c2; stte

Leren

by **Ajò Dimonios** » Mon Oct 19, 2020 10:51 am

Code: Select all: +-------------+--------------+------------+ | 79 3 4 | 79 5 8 | 1 6 2 | | 1 579 6 | 2 379 379 | 8 4 579 | | 579 8 2 | 1 4 6 | 59 579 3 | +-------------+--------------+------------+ | 8 1 59 | 59 6 2 | 7 3 4 | | 6 2 579 | 4 379 3579 | 59 8 1 | | 3 4 579 | 8 79 1 | 2 59 6 | +-------------+--------------+------------+ | 2 6 8 | 3 1 579 | 4 579 579 | | 4 579 3 | 579 2 579 | 6 1 8 | | 579 579 1 | 6 8 4 | 3 2 579 | +-------------+--------------+------------+

1)Finned x-wing candidate 5 sets{ 5r29}; cover sets {5c29}; fin r9c1=5=>-5r8c2
(rank=1) T2={5r29} L3= {5c29 5b7}=>-5r8c2

Code: Select all: +-------------+--------------+------------+ | 79 3 4 | 79 5 8 | 1 6 2 | | 1 579 6 | 2 379 379 | 8 4 579 | | 579 8 2 | 1 4 6 | 59 579 3 | +-------------+--------------+------------+ | 8 1 59 | 59 6 2 | 7 3 4 | | 6 2 579 | 4 379 3579 | 59 8 1 | | 3 4 579 | 8 79 1 | 2 59 6 | +-------------+--------------+------------+ | 2 6 8 | 3 1 79 | 4 579 579 | | 4 79 3 | 579 2 579 | 6 1 8 | | 579 579 1 | 6 8 4 | 3 2 79 | +-------------+--------------+------------+

2)Finned mutamt swordfish candidate 7 sets {7r29 7c4}; cover sets {7c9 b27}; fin r8c4=7 r2c2=7=>-7r8c2=>stte
(rank=2) T3={7r29 7c4} L5={7c29 7r8 7b27}=>-7r8c2=>stte

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