Cis-boat with tail

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Cis-boat with tail
x = 5, y = 5, rule = B3/S23 bo$obo$2obo$3bo$3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] #C [[ ZOOM 48 ]]
Pattern type Strict still life
Number of cells 9
Bounding box 5 × 5
Frequency class 19.0
Discovered by Unknown
Year of discovery 1971

Cis-boat with tail is a 9-cell still life. It was found in 1971.[1]

This still life is comprised of the normally stable boat with a normally unstable tail attached. This is one of two possible isomers, named cis due to the corner part of the boat being closer to the tail; the other isomer, trans-boat with tail, has this corner part facing outwards.


See also: List of common still lifes

Cis-boat with tail is the forty-second most common still life in Achim Flammenkamp's census, being less common than fourteener but more common than long snake.[2]

It is the 45th most common still life on Adam P. Goucher's Catagolue, being less common than cis-mirrored bookend but more common than cis-rotated bookend. It is the 5th most common still life with 9 cells, being less common than very long boat but more common than long shillelagh.[3]


The cis-boat with tail, combined with a snake or anything that catalyses the same way, is a catalyst called the "gourmet catalyst", as it is used in the oscillator gourmet, specifically as a PT8P.

An example of the cis-boat with tail used as a catalyst is in the p46 lumps of muck hassler below:

x = 43, y = 27, rule = B3/S23 23b2o$24bo$24bobo$2o23bobo6b2o$bo24bo3b2o3bo$bobo15bo10b2o3bob2o$2b2o 15bobo14bobo$18bobo5b2o9bo$20bo4b2o$27bo2$12b3o$10b2o2bo15b3o8b2o$2o8b o2b2o13b2o2bo8b2o$2o8b3o15bo2b2o$28b3o2$15bo$16b2o4bo$5bo9b2o5bobo$4bo bo14bobo15b2o$4b2obo3b2o10bo15bobo$7bo3b2o3bo24bo$7b2o6bobo23b2o$16bob o$18bo$18b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 10 GPS 8 ]]
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RLE: here Plaintext: here

Glider synthesis

All strict still lifes with a population of 21 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 31 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.


  1. Robert Wainwright (September 1971). Lifeline, vol 3, page 2.
  2. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  3. Adam P. Goucher. "Statistics". Catagolue. Retrieved on May 5, 2023.

External links