Long hook with tail

Long hook with tail
x = 6, y = 4, rule = B3/S23 3bo$obobo$2o2bo$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] [[ ZOOM 57 ]]
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Pattern type	Strict still life
Number of cells	9
Bounding box	6 × 4
Frequency class	23.1
Static symmetry	Unspecified
Discovered by	Robert Wainwright
Year of discovery	1972
Rules Outer-totalistic rules B/S23 – B35678/S012345678 # of rules 212 = 4096 Isotropic rules B/S2-i3nr – B2ikn34-ajnr5678/S012345678
Glider synthesis Fewest gliders 5 Catagolue-generated RLE synthesis Uploaded synthesis RLE longhookwithtail_synth.rle
Pattern files Plaintext longhookwithtail.cells RLE longhookwithtail.rle
Identifiers apgcode xs9_178426 Niemiec ID 9.8 Pentadecathlon ID 9.8

Long hook with tail is a 9-cell still life. It was found by Robert Wainwright in 1972, and was one of the last 9-bit still lifes to be reported.

Occurrence

See also: List of common still lifes, List of still lifes with 4 to 10 cells

Long hook with tail is the 129th most common still life on Adam P. Goucher's Catagolue, being less common than house siamese shillelagh but more common than block on bun tie bun. It is the second-rarest still life with 9 cells, being 5 times less common than long canoe but 3 times as common as long^3 snake.

Catalysis

Long hook with tail can sometimes be used as a block catalyst. Since it is a rock during catalysis, it can be used when the block gets destroyed by nearby junk while undergoing catalysis. An example can be seen in a high-clearance variant of the eater 5 that allows the compression of Herschel loop oscillators to periods of 57, 58, 59, and 60. For more of the usage of this catalyst and other block-replacement catalysts, see Tutorials/Catalyses#Block_replacements.

x = 10, y = 6, rule = B3/S23 3bo3b2o$2bobo3bo$bobo3bo$bo4bo$2o5b3o$9bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]] A variation of the tub-with-tail eater using a long hook with tail (click above to open LifeViewer) RLE: here Plaintext: here

Glider synthesis

The long hook with tail is known for being more difficult to synthesize than other still lifes of this size. Of the 31 strict still lifes of 9 bits and below, only 2, long hook with tail and long^3 snake, cost 5 gliders, which is the maximum glider cost in this group of small still lifes.

See also

• Hook with tail family

External links

• Long hook with tail at Adam P. Goucher's Catagolue
• The 10 nine-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 0/9-8.rle)
• 9.8 at Heinrich Koenig's Game of Life Object Catalogs