Long boat

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Long boat
x = 4, y = 4, rule = B3/S23 2bo$bobo$obo$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C Still life
Pattern type Strict still life
Number of cells 7
Bounding box 4×4
Frequency class 6.6
Discovered by JHC group
Year of discovery 1970

Long boat is a 7-cell still life that is an extensible longer version of a boat. It was found by the JHC group in 1970.[1]

Commonness

Long boat is the eighth most common still life on Adam P. Goucher's Catagolue, being less common than pond but more common than ship-tie. Among all still lifes with 7 cells, it is the second most common, being less common than loaf but more common than eater 1.[2] It is also the tenth most common object overall on Catagolue.

The long boat was also the eighth most common still life in Achim Flammenkamp's census, being less common than ship but more common than ship-tie.[3]

Occurrence

The long boat has two six-cell predecessors. The second can be turned into a glider by placing a tub with centre four cells below the "bend" in the pattern.

x = 12, y = 5, rule = B3/S23 o7bo$o7bo$o7bo$bobo5bo$2bo7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 2 THUMBSIZE 2 ]]
Two six-cell predecessors of the long boat
(click above to open LifeViewer)
RLE: here Plaintext: here

Glider synthesis

Long boat can be constructed using only 3 gliders; its first glider synthesis was found by John Abbott.[4] There are multiple ways to synthesize a long boat using three gliders, two of which involve a glider hitting a beehive or loaf in a synchronized way only possible if the beehive or loaf had just formed. This can be useful in soup-based glider syntheses, as the beehive/loaf (predecessor) can sometimes be synthesized together with another object more cheaply than synthesizing the two separately.[5]

References

  1. Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
  2. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 17, 2022.
  3. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  4. "Life Credits". Mark D. Niemiec. Retrieved on June 12, 2011.
  5. MathAndCode (December 12, 2020). Re: Still Life Synthesis Thread (discussion thread) at the ConwayLife.com forums

External links

Vessels
No corners (barges) (^-2) • (^-1) • ^0^1^2^3
One corner (boats) (^-2) • (^-1) • ^0^1^2^3
Two corners (ships) (^-1) • ^0^1^2^3