## 2*2=x-wing 3*3=swordfish 4*4=what?

Advanced methods and approaches for solving Sudoku puzzles

### 2*2=x-wing 3*3=swordfish 4*4=what?

displaying each candidate 2:
2x2 2xx 2xx
xx2 xxx 22x
xx2 x2x 2xx

xxx 222 xxx
xxx xxx xxx
xxx xxx xxx

xx2 x2x 22x
xx2 xxx 22x
2x2 222 x2x
looking at rows 2,3,7 and 8 do the 2s form a 4*4 version of an x-wing in the same way that a swordfish forms a 3*3 version?
i.e. if they do the candidate 2s at r1c3, r1c7, r4c5. r9c3, r9c5, r9c8 can be eliminated?
cheers muchly
cheese
cheesemeister

Posts: 8
Joined: 02 October 2005

I believe the 4x4 version of a swordfish is known as a Captain Swordfish though I'm not certain. I recommend you check with tso.
Karyobin

Posts: 396
Joined: 18 June 2005

r1c1,r1c4,r4c4,r4c6,r9c1,r9c4 and r9c6

This will remove the same candidates as your 4*4
MCC

Posts: 1275
Joined: 08 June 2005

2x2 -- X-wing
3x3 -- Swordfish
4x4 -- Jellyfish
5x5 -- Squirmbag

http://www.setbb.com/phpbb/viewtopic.php?p=35#p35
tso

Posts: 798
Joined: 22 June 2005

5X5 -- I'd much prefer "Quintopus"!
9X9

Posts: 100
Joined: 26 September 2005

9X9 wrote:5X5 -- I'd much prefer "Quintopus"!

Quintopus, pentapus, starfish, ... almost anything would be better than "squirmbag" (yuck!).
r.e.s.

Posts: 337
Joined: 31 August 2005

I think "Squirmbag" was coined in jest and unfortunately stuck. "Starfish" is far better -- and that's what I'll use from now on -- moot as it may be -- since I've never seen one.
tso

Posts: 798
Joined: 22 June 2005

Starfish (Oxford English Dictionary) - a marine echinoderm with five or more radiating arms bearing tube feet underneath [Class Asteroidea: many species.]

Starfish for >4X>4 it should be then.
9X9

Posts: 100
Joined: 26 September 2005

Mind you naming a 5x5 is a moot point for 9x9 sudoku; it will never appear without also a 4x4 or lower. If you have a starfish by columns, you have at most a jellyfish by rows.
Lummox JR

Posts: 125
Joined: 22 September 2005

9X9 wrote:Starfish (Oxford English Dictionary) - a marine echinoderm with five or more radiating arms bearing tube feet underneath [Class Asteroidea: many species.]

Starfish for >4X>4 it should be then.

... and humans have 10 or more fingers.
tso

Posts: 798
Joined: 22 June 2005

With my keyboard "skills", it's more like ten thumbs at times!.
9X9

Posts: 100
Joined: 26 September 2005