## m_b_metcalf # 202 # 9

Post puzzles for others to solve here.

### m_b_metcalf # 202 # 9

1...2...3.4....5....6....4....53....2..7.8..1....91....6....4....5....7.3...1...2

[ play ]

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

Pat

Posts: 3880
Joined: 18 July 2005

### Re: m_b_metcalf # 202 # 9

Code: Select all
`1      5789   789    | 4689   2      45679  | 6789   689    3      789    4      23     | 13689  678    3679   | 5      12     6789   5789   23     6      | 1389   578    3579   | 12     4      789    ---------------------+----------------------+---------------------46789  1789   14789  | 5      3      246    | 26789  2689   46789  2      359    349    | 7      46     8      | 369    3569   1      45678  3578   3478   | 246    9      1      | 23678  23568  45678  ---------------------+----------------------+---------------------789    6      12     | 2389   578    23579  | 4      13     589    489    12     5      | 234689 468    23469  | 13     7      689    3      789    4789   | 4689   1      45679  | 689    5689   2`

An SK-loop:
(57=89)r23c1 - (89=47)r78c1 - (47=89)r9c23 - (89=56)r9c78 - (56=89)r78c9 - (89=67)r23c9 - (67=89)r1c78 - (89=57)r1c23 - (57)r23c1: loop
Eliminations: r1c4 <> 89; r1c6 <> 9; r9c4 <> 89; r9c6 <> 9; r4c1 <> 89; r6c1 <> 8; r4c9 <> 89; r6c9 <> 8;

After these, a naked pair of 46s, a naked triple of 467s, and a sashimi Xwing of 4s to finish.

Phil
pjb
2014 Supporter

Posts: 2217
Joined: 11 September 2011
Location: Sydney, Australia

### Re: m_b_metcalf # 202 # 9

After 4 quads 2 jelly's and a swordfish I find a pair and single! Nice puzzle Pat.

Would have continued but I had to go to church. ..and I am exhausted.

After church, refreshed and renewed I continued... a triple and a sashimi x-wing finished it out.

Pat, please don't tell me you solved this without pencil marks.
dan

ArkieTech

Posts: 3355
Joined: 29 May 2006
Location: NW Arkansas USA

### Re: m_b_metcalf # 202 # 9

A very fishy puzzle indeed! It also has a rank zero 'multifish' pattern of 12389:

20 Truths = {12389R2, 12389R3, 12389R7, 12389R8}
20 Links = {89c1, 8c5, 239c6, 89c9, 2n348, 3n247, 7n348, 8n247}
12 Eliminations: r2c4<>6, r8c4<>46, r1c6<>9, r4c1<>89, r4c6<>2, r4c9<>89, r6c1<>8, r6c9<>89

After this, there is a naked triple of 467, a naked quad of 1389, and a sashimi X-wing of 4s to finish.

Phil
pjb
2014 Supporter

Posts: 2217
Joined: 11 September 2011
Location: Sydney, Australia

### Re: m_b_metcalf # 202 # 9

pjb wrote:
Code: Select all
`1      5789   789    | 4689   2      45679  | 6789   689    3      789    4      23     | 13689  678    3679   | 5      12     6789   5789   23     6      | 1389   578    3579   | 12     4      789    ---------------------+----------------------+---------------------46789  1789   14789  | 5      3      246    | 26789  2689   46789  2      359    349    | 7      46     8      | 369    3569   1      45678  3578   3478   | 246    9      1      | 23678  23568  45678  ---------------------+----------------------+---------------------789    6      12     | 2389   578    23579  | 4      13     589    489    12     5      | 234689 468    23469  | 13     7      689    3      789    4789   | 4689   1      45679  | 689    5689   2`

An SK-loop:
(57=89)r23c1 - (89=47)r78c1 - (47=89)r9c23 - (89=56)r9c78 - (56=89)r78c9 - (89=67)r23c9 - (67=89)r1c78 - (89=57)r1c23 - (57)r23c1: loop
Eliminations: r1c4 <> 89; r1c6 <> 9; r9c4 <> 89; r9c6 <> 9; r4c1 <> 89; r6c1 <> 8; r4c9 <> 89; r6c9 <> 8;

Tres cool

Luke
2015 Supporter

Posts: 435
Joined: 06 August 2006
Location: Southern Northern California

• 4 "hidden" pairs
• 2 Jellyfish
• c4 "naked" pair
— finally, one cell solved (r6c4)

• r4 "naked" triple
• (7) Swordfish
• c6 "naked" triple
• (6) X-wing [ "sashimi" not needed ]

ArkieTech wrote:
Pat, please don't tell me you solved this without pencil marks

actually i did —
but i'm stubborn;

i knew it could be solved by
"basic" moves + X-wing,Swordfish,Jellyfish
(puzzle qualifies as "superior plus"
and has now been re-posted there)

Pat (2012.Dec.12) wrote:

suppose the puzzles are filtered
and you know you will only need
"basic" moves + X-wing,Swordfish,Jellyfish
— in that case, looking for fish may be best

Pat

Posts: 3880
Joined: 18 July 2005

### Re: m_b_metcalf # 202 # 9

pjb wrote:
Code: Select all
`1      5789   789    | 4689   2      45679  | 6789   689    3      789    4      23     | 13689  678    3679   | 5      12     6789   5789   23     6      | 1389   578    3579   | 12     4      789    ---------------------+----------------------+---------------------46789  1789   14789  | 5      3      246    | 26789  2689   46789  2      359    349    | 7      46     8      | 369    3569   1      45678  3578   3478   | 246    9      1      | 23678  23568  45678  ---------------------+----------------------+---------------------789    6      12     | 2389   578    23579  | 4      13     589    489    12     5      | 234689 468    23469  | 13     7      689    3      789    4789   | 4689   1      45679  | 689    5689   2`

An SK-loop:
(57=89)r23c1 - (89=47)r78c1 - (47=89)r9c23 - (89=56)r9c78 - (56=89)r78c9 - (89=67)r23c9 - (67=89)r1c78 - (89=57)r1c23 - (57)r23c1: loop
Eliminations: r1c4 <> 89; r1c6 <> 9; r9c4 <> 89; r9c6 <> 9; r4c1 <> 89; r6c1 <> 8; r4c9 <> 89; r6c9 <> 8;

After these, a naked pair of 46s, a naked triple of 467s, and a sashimi Xwing of 4s to finish.

Phil

Is your solver programmed to find sk loops?
DonM
2013 Supporter

Posts: 475
Joined: 13 January 2008

### Re: m_b_metcalf # 202 # 9

DonM wrote:
Is your solver programmed to find sk loops?

Yes. I've also been playing with variant SK loops and almost SK loops to extend the scope. With this puzzle, the 4 symmetrical naked pairs in boxes 1,3,7,9 stood out like a sore tooth, and made me suspect an SK loop was present. Once suspected, it was easy to spot without calling on the solver.

Phil
pjb
2014 Supporter

Posts: 2217
Joined: 11 September 2011
Location: Sydney, Australia

### Re: m_b_metcalf # 202 # 9

pjb wrote:DonM wrote:
Is your solver programmed to find sk loops?

Yes. I've also been playing with variant SK loops and almost SK loops to extend the scope. With this puzzle, the 4 symmetrical naked pairs in boxes 1,3,7,9 stood out like a sore tooth, and made me suspect an SK loop was present. Once suspected, it was easy to spot without calling on the solver.

Phil

Well then, good eye!
DonM
2013 Supporter

Posts: 475
Joined: 13 January 2008

### Re: m_b_metcalf # 202 # 9

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

I didn't solve this, Pat ;
if one can spot the jellyfish, most likely it can be solved without PMs.

slightly different path,
first solved cell ... r5c5=4 (sashimi-x)
4 hidden pairs=>
2 jellyfish of {8,9}=>
naked pair of {4,6} column 4

surprisingly is all singles.
7b53
2012 Supporter

Posts: 156
Joined: 01 January 2012
Location: New York