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 ]]
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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.

Commonness

It is the 129th most common still life on Adam P. Goucher's Catagolue. Of the ten 9-cell still lifes, it is the second rarest.

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, including the long hook with tail, costs 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