200e200w's Nightmare #27

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200e200w's Nightmare #27

Postby 200e200w » Fri Feb 23, 2018 12:01 pm

Code: Select all
. 9 6|2 . 1|. . 3
2 3 .|. . .|. 8 .
. . .|. 8 .|. . .
-----+-----+-----
. 8 4|6 . .|. . .
. . 9|7 . 4|8 . .
. . .|. . 5|6 1 .
-----+-----+-----
. . .|. 2 .|. . .
. 1 .|. . .|. 4 9
3 . .|1 . 9|5 6 .

200e200w
200e200w
 
Posts: 208
Joined: 20 January 2018

Re: 200e200w's Nightmare #27

Postby SpAce » Wed Mar 07, 2018 11:06 am

Pure p&p:

1. Kraken Row: (3x5)r7 => [(5)r7c2 | (5)r3c2] => -5 r5c2 (*)
2. AIC: (3=5)r8c4 - r3c4 = r1c5 - (5=7)r1c8 - (7=3)r7c8 => -3 r7c4, r8c7
3. XY-Wing: (7=5)r8c5 - (5=4)r1c5 - (4=7)r1c7 => -7 r8c7
4. BUG+2: (5)r3c3 == (7-1)r7c7 = (1)r3c7 => -1 r3c3

(*) Step 1:
Code: Select all
(5)r7c2
 ||
(5)r7c3 - r23c3 = (5)r3c2
 ||
(5-4)r7c4 = r7c2 - (4=7)r9c2 - (7=5)r3c2

=> -5 r5c2

PS. There's a simpler way for the first step but I missed that (I'm working on my Krakens anyway):

AIC (Grouped): (6)r8c1 = (6-4)r7c2 = (4-5)r7c4 = (5)r7c23 => -5 r8c1
SpAce
 
Posts: 437
Joined: 22 May 2017


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