Help for Fishy Patterns
 

Simple fishy patterns are patterns consisting of a single number appearing at the intersections of a grid of n rows and n columns. When the numbers in the rows are confined to the columns, then any extra numbers in the columns which are not in the rows can be deleted, and vice versa. With n=2, they are called X-wings, with n=3 they are swordfish, with n=4 they are jellyfish, and with n=5 starfish (squirmbags). Complex fish occur when there is one or two extra numbers in one of the rows or columns (a fin), or a missing number (sashimi), but these generally yield fewer eliminations.

In these examples, the fish pattern described is seen after loading puzzle and using "Clear Basics" button, then choosing "All". Alternatively, one can choose fish type directly. The results shown below are what one sees after repeatedly choosing "All". Follow-on basics are not shown.

I have avoided listing complex fish where simpler fish claim the same eliminations. The only exception is where I can't find an example that survives the simpler fish.

Simple X-wings must have 4 numbers, forming a square pattern. If the number in the rows only appears twice, but more than twice in either or both of the columns then the numbers in the columns not in the rows can go. This is illustrated by the left hand image below, where there are no other 2s in the rows shown.

Complex X-wings occur much more commonly than simple X-wings. In the above images, the middle is a finned X-wing, and the left a sashimi X-wing. Note that deletions of 2's are only possibe in the box with the fins. The following are some examples, many obtained from forum.enjoysudoku.com , especially the pure xwing, swordfish and jellyfish collections

When there is a fin that is remote, ie not in same box as X-wing cells, one can sometimes construct a short chain from the fin to a cell that "sees" a potential elimination of the basic X-wing. So whether the fin is true or false, the X-wing elimination can be removed.

1.....5694.2.....8.5...9.4....64.8.1....1....2.8.35....4.5...1.9.....4.2621.....5  Simple Xwing in rows
..89.52......4....1.......94...7...1.7.6.1.9.9...2...37.......5....1......64.89..  Simple Xwing in rows
1.......2.3.4...1...5...6...4..3.......726.......5..3...2...5...8...1.4.7.......6  Simple Xwing in rows
1...2...3...3...4...5...6...7...8...2.......5...4...2...4...8...8...7...3...5....  Simple Xwing in rows
..4..935..3..6...9.........5.......6......847..9..7....91..2.6........2.28..5.17.  Simple Xwing in columns
1..2....3.4.....5...2..6...6..3.27......4......36.5..1...8..9...5.....4.8....1..6  Simple Xwing in columns
.74...6..25.8.....9.1.....2.9.5....3.....61......7..4.6...4.........2.5...37....8  Simple Xwing in columns
..12......3...14..5......6.6..7...5.....8.....1...3..9.9......1..58..........43..  Simple Xwing in columns

3.....5...6..2..7....1....4..48.5.6.....1.....7.6.43..9....3....1..7..9...3.....5  Small sashimi Xwing rows, then franken SF
69...2..........31...........314....2.....6.....3........71..4.86....5...........  Small sashimi Xwing rows, then franken SF
.....8.....87..6...5..4..3..2.4....9..6.8.7..4....2.6..3..2..9...1..35..7..9.....  Small sashimi Xwing rows, then 2 SFs, 2 Finned SFs
....1.8.47.4..2....5..3.2..63...5....452.836....3...58..3.2..8....7..4.34.7.5....  Big sashimi Xwing rows
.9..8..5...51....7.........6....9....8..5...2..14...3.8.35...4..6..2...3..2..8...  Big sashimi Xwing rows, then sashimi SF, finned SF
....9.87......1..5...7.642..6.4.738...........759.8.4..472.9...5..1......91.7....  Finned Xwing in rows, then sashimi Xwing, finned SF
1....6..5.............3.67...784...3....59...9...6......4.7.28.7.9.......123..4..  Finned Xwing in rows, then kraken XW, sashimi SF, franken SF
...9..54.....18....6.3.....84.....569..6.5..365.....18.....9.3....24.....78..3...  Big finned Xwing rows, then finned franken SF

....42.6..1..........3..78.56......8..49.56...78......4.2..9....8.2..4...3...1..7  Sashimi Xwing in columns (AKA Skyscraper, X-cycle)
..12..3...2...14..3...5...64...2...7..78..5...1...9...63..8.9.........63..29...8.  Big sashimi Xwing columns, then SF, finned SF
.6.7..8.......3..2..2.8..9..1....4.....3...6764.1............5.82..76.......29..4  Big sashimi Xwing columns 
.12......3.4...5..67.1.......65..8......3...9.....9.4..8.6..1.......4..3....9..7.  Finned Xwing in columns, then 2 sashimi SF's, franken SF
...6.3.5..9.8...1...8.....6.67.9...28..7.2..99...8.74.7.....6...2...8.9..8.3.4...  Big finned Xwing in columns, then another in same cells, then 2 finned franken SF's in same cells
1..2.34..3..5......6..4....2.7....8...9...1...5....2.7....3..6......8..4..34.7..9  Big Finned Xwing in columns, then finned Xwing in columns 
1..2.34..5..4......6..7....7.8....3...3...9...9....7.8....1..5......8..6..19.2..7  2 Big finned Xwing in columns, then 2 big SF in rows

1..2....3.24....5........6....1.2..7....5....3..8.6....5........6....54.9....3..1  Kraken Xwing (then 2nd kraken XW)
1..2....3.24....1........5....4.3..6....5....5..1.7....7........5....72.3....8..4  Kraken Xwing
.5.....9...3...1.....8.7.....9.3.2...2.....7...8.9.4.....5.2.....1...8...7.....2.  Kraken Xwing
........1.......2...3..4........53...1....6..27..........126......489......75346.  Kraken Xwing
.12...3..45.1.....6.7.....8.9.6....7.....75......8..4.2...4.8.......5.7...62....4  Kraken Xwing
3.......8.8.....9....6.5.....61.25......3......75.64.....4.7....4.....2.9.......3  Kraken Xwing (or Finned Mutant SF)
...........12.34...536.718..35...74.....3.....72...89..143.825...81.23...........  Kraken Xwing (after Xwing)
...........1.2.3...43.5.62....1.7....74...86....8.9....62.9.53...5.1.4...........  Kraken Xwing (after 2 Xwings)
.....8..2..5.3..4..3.2..6....3..54...6..8...15..3...7...15....9.5...9.2.9...6.7..  Kraken Xwing (after 2 Xwings, SF)
.1.....2.2..3.4..5...1.6....427.861...........965.278....2.3...8..6.5..1.5.....6.  Kraken Xwing (after sashimi XW, then finned SF, finned JF, sashimi mutant JF)

An interesting variant is the sashimi X wing in the next image.

This configuration is sometimes called a 'skyscraper', and can also be viewed as an alternating chain (x-cycle) of 7's of length 4. In the image either 2 on the right can be viewed as the fin and the other as part of the X-wing

Swordfish

A simple swordfish has the number occurring at the intersections of 3 rows and 3 columns. It doesn't have to fill all 9 cells, but may have 6, 7, 8 or 9. As with X wings there are finned and sashimi variants. The following examples give examples of these. The order of execution (which impacts a lot on which fish is found first) is:

x-wings
finned and sashimi x-wings.
kraken X-wings
simple swordfish
finned and sashimi swordfish
simple franken swordfish
finned and sashimi franken swordfish
simple mutant swordfish
finned and sashimi mutant swordfish
simple jellyfish
finned and sashimi jellyfish
simple franken jellyfish
finned and sashimi franken jellyfish
simple mutant jellyfish
finned and sashimi mutant jellyfish
simple starfish
finned and sashimi starfish
5..6..29832...8.....87...532....9...94.....15...8....986...75.....2...61432..5..7  Normal SF in rows (8 cells occupied, after xwing, kraken XW)
3.1.9......68......8..5.3.41....58..8...2...6..49....75.3.8..1......27......4.5.9  Normal SF in rows (8 cells occupied, after 3 xwings)
...........91.57...539.241..61...59.....3.....94...37..162.394...58.12...........  Normal SF in rows (7 cells occupied, after kraken XW)
...........12.34...5.4.6.1..17...36...........89...75..3.7.5.8...43.29...........  Normal SF in rows (7 cells occupied, after sashimi XW, kraken XW)
...7...1...8..1..52....486....9..4.8.352............21......6..6.31....7.4..9....  Normal SF in rows (6 cells occupied)
.....2.....7.9....61..7...57.5....42...4..3.....86..5.39.....6......1.9812.......  Normal SF in rows (6 cells occupied)
4.6..2........4....5.3..1...8.1..93........2..2.9..85..3.8..5.......7...7.1..9...  Normal SF in columns (all 9 cells occupied, then 2nd SF in columns, finned XW, JF)
26.9.7.4373.....89.........1..3.6..5....7....4..5.2..1.........34.....9792.4.3.16  Normal SF in columns (8 cells occupied, after kraken XW, then 2 finned SF's, 2 sashimi SF's)
....1.73......4..2...8.316..4.2.681...........681.7.2..843.1...9..4......17.6....  Normal SF in columns (7 cells occupied, after 3 finned XW's, then finned franken SF)

..15......3...45..6......7.8..1...3.........6.4...2..1.9......8..27.........354..  Finned SF in rows
...1...59...7..42.....64.8...9....1..21....9.7.....3...7....8..653......98..32...  Finned (big) SF in rows
1....2..3..4....1..5..6.2.......76..8...9...2..56.......8.7..3..3....1..6..8....4  Finned SF in rows (then 2 Finned SF in columns)
..3...6...7.5.8.2.4.......7.8.2.4.6...........2.8.9.5.7.......1.9.4.2.7...5...8..  2 Finned SF in rows (then 2 jellyfish and one swordfish)
.....1..2..34..5...6..7..3..5......7..8...1..4....6.9..3..9..6...5..49..1..8.....  3 Finned SF in rows
..7.4.9...2.1.3.4.3...7...2.9.....7.6.8...4.9.7.....6.8...1...5.1.5.6.9...5.3.1..  Sashimi (big) SF in rows (after big finned SF, then big finned SF)
..49.5.1.5.8...3..7......56....6..9.2..5.3..1.4..2....12......5..7...1.3.6.7.19..  Sashimi (big) SF in rows (after 2 XW's, then sashimi XW, kraken XW, XW, finned SF, finned mutant SF)

..1.2.3...4.3.5.6.3...7...5.1.....8.7.8...9.4.9.....5.1...6...9.8.1.2.7...5.4.2..  Finned SF in columns (big, 9 cells)
.....1..2....2.34...53.......1.5..6..3.6....77....48...9...6....7.2....58...9..76  Finned SF in columns (9 cells)
...........1.2.3...3.4.1.5...67..2...8...2.1...5.3.4...1.6.9.3...3.5.6..........9  Finned SF in columns
1....2..3..4....5..6..7.8.......72..9...6...4..53.......1.3..6..2....9..7..5....8  Finned SF in columns (then 2 sashimi XW's, 2 finned SF's)
..1.2.3...3.4.1.5.2...5...6.1.....7.3.5...6.8.8.....3.1...9...7.6.5.8.2...9.7.4..  Finned SF (big) in columns (then big sashimi SF and franken SF)
.8...2.3.4..5....6..187......2...9...5..9..7...4...1......876..3....1..7.4.6...2.  Sashimi SF in columns 
...9..7..4..2...8..6...3..57...3........4.2...9......8.51..2..3.8.1.......6..5..9  Sashimi SF in columns
3.......1.9.4.1.6..14...89...3...4...589.437.7...3...848.6.5.37.7.8.3.2.....7....  Sashimi SF (big) in columns (after 3 finned XW's) 

Franken Swordfish

A franken swordfish has a digit confined to either 3 rows / 2 columns and a box, or 3 columns / 2 rows and a box. Rather than try and explain it, I will refer you to here for a description. When a puzzle has no X-wing or simple swordfish, there may be either a franken or mutant swordfish. Currently, as in hierarchy above, it will find the franken first when the "all" choice is made.

There are 4 types, best described at here. The following illustrate the 4 basic patterns (rrr\ccb, ccc\rrb, ccb\rrr, rrb\ccc). The blue boxes define the pattern, noting that not all the blue boxes have to have a pattern digit: (purple areas = no pattern digits, Xs = possible eliminations)

        
Type rrr\ccb:
.8....64.....4....3.4..6..2....5.....9.76...57.3...1......9....1..4..7.996...2..3 (or sashimi JF)
..1.2.3...4.5.3.1.3...6...5.3.....7.7.8...2.3.6.....5.4...9...1.1.4.2.6...5.1.8.. (or mutant SF)
....1......23.45...5.....6.7.......3.8.6.9.7...1...2...6..7..5...3...4......2.... (or mutant SF)
...123......4.5.....4...6..74.....363.......228.....45..8...9.....8.9......372... (or mutant SF, or franken JF)
..1.2.3...2..4..5.4..6.7..1..8...5..23.....68..6...7..8..2.3..5.4..8..3...2.7.8.. then finned XW, finned mutant SF, and sashimi JF
2....358.....2...1...4.56.....9.4.68..5.1.9..61.8.2.....15.8...3...4.....263....4 (after kraken XW, or mutant SF)
.1.....2.34.....56...6.4.....57862.....9.5.....74235.....3.7...96.....32.5.....1. (or mutant SF, after finned SF )
.9.....8...8...7.....2.5.....2.7.4...7.....9...6.4.5.....1.9.....3...6...1.....3. (after XW, sashimi XW, finned SF, sashimi SF)
..........1.2.3.4....456....93...75...2.8.6...47...89....934....3.5.2.6.......... (after XW, 2 finned XW, sashimi SF)
...........12.34...2.1.5.6..64...18...........87...92..1.3.8.5...97.23........... (after 5 SF's, then 3 finned franken SF's)
1..2....3.24....5........6....1.7..8....2....7..9.3....5........6....42.3....8..7 (after finned XW, then 2nd franken SF)

Type ccc\rrb:
5..63...9..7....5.8..2..1...2.8......7......6..6..74.86..9...7..3..28.....9...3.1
......8.6.9...1.4...3.6.......4...1...8.2.6...5...7.......8.2...1.5...9.5.7......
1..2....3.45....6........7....5.8..2....6....3..9.1....8........7....54.2....3..1
..1.2.3...4.5.6.1.7...1...6.8.....7.1.7...8.5.2.....6.2...5...4.5.1.2.8...9.6.5.. then JF
.....7..9....3.45...6....31....2.....5.8.16..1...6..84.7..4.9...98..2...3.5..9... (or mutant SF)
..6...2...2.1.3.4.7.......8.3.9.4.7...........1.3.2.6.5.......9.9.7.6.3...2...1.. (or mutant SF, then JF)
..6.5.3...4...2.6.9.....5.8.......2.1...3.9...2.......8.3.4...7.6.5...9...5...8.. (or mutant SF)
..17......9...45..8......4.6..1...7.....2.....4......6.5......4..73...1......13.. (or mutant SF, after finned SF)
7...2......1..9.6..8.4..2....6....5.9.......1.3....7....2..6.9..4.7..8......3...6 (or mutant SF, after sashimi and finned SFs)
1.......2.7.4...9...3...8...4..3.......517.......2..6...2...1...6...9.4.5.......3 (after variant SK loop, SF)
..........5.1.2.7....345....95...16...6.8.5...27...49....861....1.4.3.5.......... (after sashimi SF)

Type ccb\rrr:
8..3.1..2...........7.5.3..9.......8..5.8.9..7.......4..6.3.7...........4..9.2..1 (or mutant SF)
2..1.4..3..78..1.........9.1..9...3....271.........5...3.49.........7..2..6..27.. (or mutant SF)
4.....71.7..4.9.2..625714.95.6...8..2738.4..1.4.3.62.7154.2.9...279..1.....145.72 (or mutant SF)
1...2...3.....4..5......6.7...3....12...8..3..4...5.6...7...1......78...9561....8 (or mutant SF)
..1.2.3...4.1.3.5.5...6...1.7.....4.4.8...2.6.1.....9.9...3...7.8.6.9.3...4.5.9.. (or mutant SF)
...3.9.7.8..4.....1........2..5..6...3.....4.....1....5.....8......2.1.....7....9 (or mutant SF)
..5.6.9...2.1.3.4.3...8...2.9.....7.6.4...2.9.3.....5.9...1...5.1.5.8.9...8.3.1.. (or mutant SF)
1.......2.8..1..4...54.67....85.43.............23.18....31.72...6..9..7.8.......5  Finned  (or finned mutant SF)
1...2...3.3.4...5...2...6....7..1....4..8..9....9..8....9...4...5...7.8.7...6...1 (or mutant SF, after sashimi XW)
..12......3...14..5......6.6..7...5.....8.....1...3..9.9......1..58..........43.. (after XW, 2 finned XW)
.....1..2.....345...2.5..61...7...1...7.26...36..4...8.1......7.243...9.8.9..21.. (or mutant SF, after finned XW)
..1...4...32...18.54.....36...1.3......642......7.8...81.....72.27...34...5...8.. (after finned SF, sashimi SF)
..1.2.3...3.4.1.5.2...5...6.1.....7.3.5...6.8.8.....3.1...9...7.6.5.8.2...9.7.4.. (after finned SF, sashimi SF)

Type rrb\ccc:
...........12345....2...1...3.....6..7.148.3..8.....4.5.......78..761..26.......3 (or mutant SF)
..1.2.3...3.1.4.5.4...6...7.1.....3.3.2...4.8.7.....9.1...4...5.4.2.7.6...7.9.8.. (after finned SF, sashimi SF)
...........12345...2.6.5.7..58...31..6.....5..17...82..3.7.2.4...21439........... (after 2 XW, finned franken SF)
.9.8..5..6..3..2..4..5...76..9.2..8..6.9.8.3..3..4.9..35...1..7..6..5..9..7..6.5. (after sashimi SF, finned franken SF)
...5....738...79.62.7.9...3..3.......6297..31...34.2..531...7...78.......2.78.31. (or mutant SF, after sashimi and finned XWs) 
8.319.56.649.85..31.5.6..984..5198...82.4.9519518.2...21.9....559.42......4.51289 (after finned XW)
...3.6....2..4..7.8.......9..4...5...8.7.3.4.9.......11.......5.7..5..2...5...1.. (after sashimi XW, finned XW, kraken XW)
67.9.....2...38.....34.7..552....6...47...58...6....494..8.69.....51...6.....3.78 (or mutant SF, after XW, finned XW, sashimi XW)
..1.2.3...3.1.4.5.4...6...7.1.....3.3.2...4.8.7.....9.1...4...5.4.2.7.6...7.9.8.. (or mutant SF, after finned SF, sashimi SF)

Finned Franken Swordfish

The following are finned/sashimi examples:

Type rrr\ccb:
..7.8..1...621.......4.67.2..8...6.....1..2....1.6..3......9..5.9.83.....8.7....4  Finned  (or finned jellyfish)
1....2..3.4.5..6....7....8..2..5.......8.9..53...64....8....4....6....7.5...3...1  Finned 
1.......2.3.4.5.6.......7....5...6.....8.3.....7...9....9.......8.6.2.4.5.......3  Finned 
.1.....2.3...4...5..6...3.....6.5....2.....7....2.1.....2...1..5...6...3.7.....8.  Finned 
.1...2.3.3..1....2..435......1...2...6..4..7...7...6......857..5....6..4.8.9...6.  Finned 
1..9....3.24....5........6....1.7..8....2....8..5.3....4........6....52.3....8..1  Finned  (or finned mutant SF)
1.........2.134.....5...3...4.6...5..3..7..2..8...5.9...8...7.....218.6.........2  Finned  (or finned mutant SF)
...........14325...4.1.6.3..73...62..6.....8..54...31..2.5.1.9...63287...........  Finned  (or finned mutant SF), then franken SF 
1...2...3.....3..1......4.5...6....72...5..1..3...1.5...5...7......86...6847....9  Finned  (or finned mutant SF), then franken SF
...........12945...2.5.1.9..14...26..5.....1..72...85..3.7.9.2...63527...........  Finned  (or finned mutant SF)
.....1.23...4..56.....7.1.8.6...48....4..2...8..71.....169..3.598.......7.5...6..  Finned  (after finned XW, finned SF)
....1......23.45...6.....7.4.......7.3.6.7.8...5...1...9..2..3...7...2......5....  Finned  (after 2 SFs, 2 XWs, then XW and sashimi JF)
.74........38.....1....5..25..3.716...........629.1..39..2....1.....38........67.  Sashimi (or sashimi mutant SF)
.1.....2...3...4.....5.6.....7.4.1...2.....5...8.7.9.....8.7.....4...7...5.....6.  Sashimi (or sashimi mutant SF, then finned franken SF)
..63....425...7183...5......2.46..1.4.......5.1..75.3......4...3417...288....17..  Sashimi (after sashimi XW) (or sashimi mutant SF)
1.......7.6..4..5...56.78....45.21.............83.67....62.94...3..6..2.5.......9  Sashimi (after finned SF)
..9.8.3...3...5.4.4.....6.2.......2.2...9.1...8.......7.1.6...3.4.5...1...5...7..  Sashimi (after finned XW, finned SF)
...........12.34...56.7.12..8.....7...9...3...2.....4..62.8.95...34.92...........  Sashimi (after finned XW, 2 finned SF) (or finned mutant SF)
..1.2.3...4...5.6.3.....1.4.......7.2...8.5...6.......8.9.5...2.5.7...1...3...9..  Sashimi (after finned SF) (or sashimi mutant SF)
....1......23.45...6.....7.3.......5.7.2.5.3...6...1...2..8..9...1...3......6....  Sashimi (after 2 finned XW, finned and sashimi SFs)(or sashimi mutant SF)

Type ccc\rrb:
1.2...3...3.....4.5.....6.7....31......482......59....7.4.....8.6.....1...8...9.2  Finned 
1.........2.345.....6...3...5.1...7..4..2..8..9...6.3...7...9.....617.2.........1  Finned 
8.....7...2.9...1...5.....3..82....7.1..8..3.6....51..7.....8...8...1.2...4.....5  Finned 
....6......15.36...9.....2.4.......3.8.....7...52.68...1..8..9.3...7...4.........  Finned  (or finned mutant SF)
3.1...64.6.49.35.7.5.64...34.586.1...6.3.24....84.....5.67843...7..36.54.43......  Finned  (or finned mutant SF)
...........12345....2...6...4.....7..3.147.2..6.....3.4.......37..816..45.......1  Finned  (then franken SF, two sashimi mutant SF)
..1..23...2.....4.8..6....7..31....5.........6....89..7....9..8.4.....3...25..4..  Finned  (after XW)
.....3..1....8.79...81.......3.6..1..2.7....64....85...3...4....1.3....27...9..35  Finned  (after 2 sashimi XW, then franken SF)
...........12.58...5.3.6.2..65...17.....7.....27...96..4.8.2.3...89.76...........  Finned  (after finned XW, finned franken SF)
3.......6.6.....2....9.8.....51.28......3......94.51.....8.1....5.....7.8.......3  Finned  (after sashimi XW, sashimi SF, finned SF)
.....1..2..3....4.56.....7.....823.....9.6.....145.....2.....56.9....1..7..3.....  Sashimi 
.....1..2..3....1.45.....6.....457.....3.6.....621.....1.....75.3....8..5..4.....  Sashimi
1.......2.3.1.4.5.......6....1...7.....7.3.....6...5....8.......7.5.2.4.9.......3  Sashimi (then 1c finned mutant SF)
.....1.23...4..56.....3.1.7.4...57....6..2...7..89.....631..9.587.......9.1...6..  Sashimi (after sashimi XW, 2 finned XW)
1..2....3.42....5........6....1.2..7....3....3..4.5....5........8....54.7....3..1  Sashimi (after finned SF, finned franken SF)
...........5.2.3...2.6.1.8...2.5.7...5.267.3...8.9.4...3.4.5.6...4.8.9...........  Sashimi (after 4 XW, 2 SF, then franken SF)
...........12345...2.6.5.3..14...27..5.....1..82...46..4.8.6.2...64138...........  Sashimi (after finned XW, sashimi franken SF)
....1.......234.....35.61....5.9.8...4.....3.6.......2..8.5.9...2.....6.7.......4  Sashimi (after 2 SF's, 5 sashimi XW's)
1.....2...3..4..1....5....6..13.7.2.....6.....5.8.27..9....3....6..7..5...2.....8  Sashimi (after XW, finned XW)

ccb\rrr:
..123.4.........5..6.....7.5.43......7.......2.81......5.....9........3...948.1..  Finned 
4.......3.6.5...1...8...4...7..3.......746.......8..5...9...8...5...9.6.2.......4  Finned  (or finned mutant SF, after kraken XW, then franken SF)
..1...2...3.4.5.6.6.......4.5.6.2.7...........2.7.3.4.8.......9.6.2.7.3...3...6..  Finned  (or finned mutant SF, then 3 consecutive jellyfish)
.1..2....3..4..5.......1.6..4...51..6..7....8..3.8..7..2.3.......4..6..7....7..8.  Finned  (or finned mutant SF, after sashimi XW)
...........87.24...95.4.31..3.....7...7...2...6.....4..73.1.89...23.81...........  Finned  (after finned XW)
.....1.23...4..56.....7.4.8.5...38....7..4...8..21.....389..2.469.......5.2...6..  Finned  (after finned XW)
.....1..2..3....4.45.....6.....137.....5.6.....624.....4.....31.8....5..2..6.....  Finned  (after finned XW, then finned franken SF)
.1..2....3..4..5.......1.6..4...51..6..7....8..3.8..7..2.3.......4..6..7....7..8.  Finned  (after sashimi XW)
..4...3...8.9.5.2.1.......6.6.1.9.5...........9.5.8.4.7.......1.1.4.2.9...5...8..  Finned  (after finned XW, sashimi SF, finned SF, then JF)
........1....2345...31.......4.67.2..5.2....4.6.4...8..4....9.7.3.9.5...9...1.5..  Sashimi (after finned XW)

Type rrb\ccc:
.....1..2.....345...3.6..17...2...4...8.39...72..8...3.6......4.856...7.1.2..86..  Finned  (or Finned Mutant SF)
..1..2..3.3.....4.5...6.2.....7.3..8..7...5..2..5.6.....5.2...4.4.....5.6..4..9..  Finned  (or Finned Mutant SF, then finned mutant SF)
...1.2......3.4.....5.6.2...3.....7...12.54..7.......88.......4..4.9.6...7.....3.  Finned  (after finned XW, then sashimi starfish)
..4.9.3...2...1.9.6.....8.2.......6.9...3.4...7.......8.3.4...7.6.1...3...2...5..  Finned  (after finned SF)
.....4..3..1.5.....3..62.7..7...32..39..7..48..62...5..5.48..6.....3.7..6..5.....  Finned  (after 2 finned XW)
7..8..2...9..2..3...8..3..12..6..1...5..1..6...3..7..93..1..5...7..5..4...5..4..2  Finned  (after 2 finned SF)
1.......2.3.4...1...5...6...4..3.......726.......5..3...2...5...8...1.4.7.......6  Finned  (after XW, kraken XW, SF)

Mutant Swordfish

A simple (unfinned) mutant swordfish has a digit confined to a row or column and two boxes. The unfinned pattern is duplicated by continuous grouped chains. This pattern occurs frequently, but in most there is a swordfish (simple or franken) which gives the same eliminations. The following illustrate the basic patterns: rcc\rbb, rbb\rcc, rcb\rcb, with the first two having a corresponding column based puzzle (rrc\ccb, cbb\rrc). The blue boxes define the pattern, noting that not all the blue boxes have to have a pattern digit: (purple areas = no pattern digits, Xs = possible eliminations)

     

The only examples I have encountered where there is no simple or franken swordfish duplicating their eliminations are the type 3 (diagonal) ones.


Type rcb\rcb
.23.5.6.9..61.........6.5.42......6....9...2.8.1.2.4.3.72..1..661..3.8.....64...1
...........12345....2...6...3.....4..7.618.3..8.....1.4.......88..752..15.......2 (after finned SF)
12...7.8.4.61..2..78.2634.1217.389....8.1.7..6.4.72318.7.891..4.4.7.61..9613..8.. (after finned SF, sashimi franken SF)

Finned Mutant Swordfish

Finned or sashimi mutant swordfishes are far more common, and here there are fewer finned or franken swordfish claiming the same elimination(s). As above, however, there is usually a grouped single digit chain which achieves the same eliminations.

Type rcc\rbb
.....1.2.1..23......4.5.6..7...4..5..835.274..4..7...9..7.2.5......65..3.3.9..... Finned
.....1.23...4..56.....5.4.7.8...32....6..7...1..28.....759..3.434.......8.9...7.. Finned
..4...6...2.1.3.4.3.......8.8.2.7.5...........6.3.4.1.2.......9.4.5.9.6...7...3.. Finned (after franken SF)
1.........2.345.....6...4...5.7...8..4..9..1..8...6.7...8...3.....218.9.........1 Finned (after finned XW)
.....12...3..4..5.6.78..4..4.....1...2.....6...3.....9..1..49.2.5..3..7...89..... Finned (after finned XW)
.1.....2.3..4....5..2..61..5....74...6.....1...12....3..47..2..7....8..1.9.....6. Finned (after finned SF)
....9.......251.....94.78....8.7.6...2.....7.1.......4..6.2.5...4.....3.2.......1 Finned (after sashimi XW)

Type rrc\ccb
...2..7.8...4.9.......18..243....87...7...5...51....349..12.....1.6.5...3.5..7... Finned
..1..2..3.3.....4.5...6.7.....7.4..6..8...5..6..5.9.....3.1...7.4.....3.7..9..2.. Finned
.............1......23.45...6.....7.3.......8.7.9.5.4...9...2....3.6.8...1..4..6. Finned
.1.....2.2..3.1..4...5.6....274.361...........531.284....2.8...3..7.4..1.4.....3. Finned
1.........2.345.....3...4...6.1...7..4..5..6..5...8.9...9...3.....237.5.........8 Finned
1.......2.2.3...1...4...5...6..7.......845.......1..9...5...4...9...2.3.4.......8 Finned (after XW)
.6.....1.1..9....6..5..42..4....39...1.....2...78....5..94..7..6....2..8.8.....6. Finned (after 2 finned SF)

Type rbb\rcc

Type cbb\rrc

Type rcb\rcb
.4.....9...6...1.....3.9.....1.7.6...2.....3...5.1.7.....4.6.....7...9...3.....4. Finned
...........12345...3.6.1.4..53...71..6.....2..28...49..8.4.9.5...95632........... Finned
...........5.2.6...2.1.3.4...2.5.1...5.267.3...8.1.4...4.6.5.1...6.7.9........... Finned (after SF)
...........12.34...234.516..54...82.....5.....87...35..153.624...68.25........... Finned (after sashimi SF)

Jellyfish

A simple jellyfish in rows (rrrr/cccc) or columns (cccc/rrrr) has the number occurring at the intersections of 4 rows and 4 columns. It doesn't have to fill all 16 cells, but may have between 8 and 16. As above there are finned and sashimi variants. The following examples give examples of these.

 
1.2...3...4.....5.3.....1.6....76......251......48....6.7.....3.5.....4...1...2.9  Jellyfish in rows, 16 cells
1.2...3...4.....5.3.....6.7....82......473......65....7.6.....3.5.....4...3...9.1  Jellyfish in rows, 16 cells
1.......2.3..2..4...25.63....76.58......7......92.86....59.37...7..5..9.9.......8  2 consecutive jellyfish in rows, 15 cells
1.........5.638.....2...4...4.7...3..8..9..5..6...1.2...3...9.....452.8.........6  Jellyfish in rows, 15 cells
.1......22......3...4..56......167.....8.9.....654......76..5...2......19......2.  Jellyfish in rows, 16 cells (following SK loop)
1.......2.3..4..5...67.81....12.34.............28.46....74.63...1..8..7.9.......4  2 consecutive 15 cell jellyfish in rows
..1...2...2.1.3.4.5.......6.1.3.6.7...........3.4.7.2.1.......7.6.7.4.3...8...9..  3 consecutive 15 cell jellyfish in rows
..5...8...1.4.5.6.7.......1.5.9.6.2...........6.1.2.4.4.......9.2.6.9.1...1...3..  3 consecutive 15 cell jellyfish in rows

...........1...2..34..5..67.........15.2.3.7883.....41.........42.7.8.5671.....83  Jellyfish in columns, 15 cells (after XW, finned and sashimi SFs)
.............1.....123.456...........27...38..36.5.42...........682.715..74...83.  Jellyfish in columns, 16 cells (after finned and sashimi SFs)  

1..2....3.2.....1...3..14..2....41......3......56....7..17..3...8.....4.9....6..2  Finned JF in rows
1..2....3.24....5........6....1.3..7....2....4..5.6....8........9....24.3....7..9  Finned JF in rows
1.........2.341.....5...4...3.5...6..4..7..2..8...9.1...8...6.....652.8.........5  Finned JF in rows (then second finned JF)
9.......3....6......27.54....7..61...9.....7...52..6....64.75......1....8.......2  Finned JF in rows (after finned SF, finned mutant SF)
.....1..2....2..6...45..1....12...3..4..5...75....48....8..5....6.3....83...1..9.  Finned JF in rows (after 2 XWs)
.....7..2..3....7.58.....4.....821.....4.9.....415.....4.....57.2....9..1..5.....  Finned JF in rows (after finned SF)
..12.34......5....2...6...51...7...6.345.817.7...3...29...1...4....4......59.27..  Finned JF in rows (after XW, finned XW)

.12...3..45.1.....6.7.....4.8.3....7.....75......4..9.2...9.4.......5.7...62....9  Sashimi JF in rows
..67..391..9....623............3...4..72...1.4....1....31..8.75...9......65....3.  Sashimi JF in rows
...........42.81...85.3.46..5.....3...8...9...6.....7..37.4.61...91.38...........  Sashimi JF in rows (after XW)
..23..615..9.........1...4..1........23.6...99.....87..9....7..6..4...8...521....  Sashimi JF in rows (after finned SF)
.1.....2.2..3.1..4...5.4....452.316...........721.859....8.2...3..7.5..6.5.....8.  Sashimi JF in rows (after finned XW, XW)
1..2....3.24....5........6....3.1..7....2....7..4.6....6........8....24.3....7..1  Sashimi JF in rows (after sashimi XW, finned XW)
....1......2...3...345.627...6...1..7.......4..5...8...271.963...3...4......8....  Sashimi JF in rows (after sashimi SF, finned XW)
1..2.34..3..4......5..6....7.3....2...8...9...4....6.7....4..8......9..5..26.8..1  Sashimi JF in rows (after finned XW, finned SF)
1.......2.2.3...4...5...1...6..7.......489.......1..5...1...7...4...6.2.7.......8  Sashimi JF in rows (after finned XW, franken SF)

.1...2.3.2..1....5..463......5...7...8..4..2...1...8......279..9....8..7.7.3...8.  Finned JF in columns
...65......6..9.1..93.18......5..8.32....6...8..3..1.5......9...6.9.3....17.2....  Finned JF in columns
.....1.2.3.....4...125..6..5...6.7.....1.4.....8.3...9..9..217...7.....3.8.4.....  Finned JF in columns
..12.34......1....4...5...62...7...1.653.489.8...6...45...8...3....3......69.15..  Finned JF in columns (after finned XW)
.1.......2.....3.....4.516...45.37.............37.65...721.4.....6....8.........9  Finned JF in columns (after finned XW, then 4 finned starfish)
1....2..3.4.5..6....7....8..2..4.......2.8..15...73....9....4....8....9.3...2...5  Finned JF in columns (after type A variant SK loop)
.1.2.3.4.5...6..........7..7..5.6.1...........8.1.4..6..4..........1...5.3.8.2.9.  Finned JF in columns (after 2 finned SF)

...4...7...3...1...5..2...64..1...3...8.3.5.......7....7..5..4.1..3..8....6......  Sashimi JF in columns
........1.21....3.4..5..6...78..2...............9..54...6..9..7.1....42.3........  Sashimi JF in columns (after sashimi XW)
..1...2...3.....4.5...6...7...1.2....4..3..7....8.9...6.......4.7..5..3...2...9..  Sashimi JF in columns (after finned SF)
1.........2.345.....6...4...3.6...7..4..8..2..9...1.5...9...7.....269.1.........6  Sashimi JF in columns (after finned SF)
.1...2.3.2..3....4..356......7...8...6..7..1...5...4......185..7....9..2.4.7...6.  Sashimi JF in columns (after finned SF, franken SF)
....1......23.45...3.....6.2.......1.6.7.2.4...3...8...5..6..7...1...3......4....  Sashimi JF in columns (after finned XW, franken SF)
1.....2...3..2..4....5....6..76.1.3.....5.....4.8.27..2....5....8..7..5...6.....1  Sashimi JF in columns (after finned SF, sashimi XW, then finned JF)
.1.2.3.4.5...1..........9..1..6.4.8...........2.9.1..5..4..........5...7.6.8.2.3.  Sashimi JF in columns (after finned XW, finned SF, finned franken SF, finned JF)

Franken Jellyfish

I find it hard to find franken jellyfish that are not extinguished by simpler fish. However, these (rrrb\cccc, cccb\rrrr) survive simpler fish .

Type rrrb\cccc
..67..391..9....623............3...4..72...1.4....1....31..8.75...9......65....3.  (after finned franken SF, sashimi JF)
1.......2.3..1..4....5.6.....3...7...5.8...3...6.2.9.....3.5....8..4..1.4.......7  (after sashimi XW, sashimi SF, franken SF, finned franken SF, sashimi JF)

Type cccb\rrrr
8..3.1..2...........7.6.9..1.......3..9.8.7..2.......4..8.1.5...........3..4.8..1  (after SK loop, SF)
1.......2.7.4...9...3...8...4..3.......517.......2..6...2...1...6...9.4.5.......3  (after 3 XW's, SF, franken SF, finned JF, sashimi JF)

Mutant Jellyfish

Similarly, here are some (of many types) of mutant jellyfish to survive simpler fish (rrbb\rccc, ccbb\rrrc). Other types (see UFG for exemplars) are coded for but no examples forthcoming.

Type rrbb\rccc
...........12.34...234.516..64...75.....5.....58...63..153.624...67.25...........
...........12.34...435.617..34...75.....3.....76...28..153.284...27.53...........  (after sashimi SF, finned JF)
...........12.34...2.5.6.3..53...17...........67...58..8.3.2.6...47.12...........  (after sashimi SF, finned franken SF, then mutant JF)
...........43.82...125.736..23...14...........71...82..586.143...72.35...........  (after 2 XW's, 5 SF's, finned franken SF, then mutant JF)
1..2.3..4...........2.5.6..2.......3..5.2.7..4.......1..6.7.8...........3..4.8..9  (after six SF's, two franken SF's)

Type ccbb\rrrc
...........72.34...536.718..35...84.....3.....21...57..143.825...81.23...........  (after sashimi SF, finned mutant SF)
1..2.3..4...........3.5.6..7.......3..8.9.4..5.......9..6.8.5...........2..7.5..1  (after four finned SF's, franken SF, mutant JF)
...........79.56...124.793..23...15...........94...72..852.149...13.45...........  (after four finned SF's, four finned JF's, mutant JF)

Type rrbb\rccc
...........73.16...125.738..28...75...........63...82..857.246...16.35...........  Finned (after five finned SF's, finned franken SF, two mutant JF)

Starfish (squirmbags)

A simple starfish in rows (rrrrr/ccccc) or columns (ccccc/rrrrr) has the number occurring at the intersections of 5 rows and 5 columns. As above there are finned and sashimi variants. I have no example of a simple starfish surviving simpler fish. However, these finned varieties do survive:

12.....34..3...1..5...6...72..5.7..8..5...4..8..6.4..33...7...6..2...3..41.....82  Finned starfish (after finned XW, then 2nd finned starfish)
1.......2.3.1.4.5.......6....1...7.....7.3.....6...5....8.......7.5.2.4.9.......3  Finned starfish (after sashimi franken SF, finned mutant SF)
.1.....2.3...4...5..6...3.....6.5....2.....7....2.1.....2...1..5...6...3.7.....8.  Finned starfish (after finned franken SF)
.1.......2.....3.....2.456...46.72.............75.36...723.1.....5....8.........9  Finned starfish (after finned XW, then 3 more finned starfish)
...........18.76...965.438..18...94...........63...17..597.341...79.65...........  Sashimi starfish (after finned XW, 2 finned SF, 2 sashimi SF)
........1.23....4.5..6..7...17..3...............8..65...1..7..3.9....86.8........  Sashimi starfish (after sashimi XW, finned JF, then sashimi JF)
...1.2......3.4.....5.6.2...3.....7...12.54..7.......88.......4..4.9.6...7.....3.  Sashimi starfish (after finned franken SF, finned XW)

Using the "All" button repeatedly, you have to go through one XW and 4 SFs before getting the sashimi starfish. If you only choose the "Starfish" button, you get 5 starfish in a row.