Long boat

	Long boat
	<a href="/wiki/File:Longboat.png" class="image" title="Long boat image"><img alt="Long boat image" src="/w/images/6/62/Longboat.png" decoding="async" width="98" height="98" /></a>
	<a href="/wiki/File:Longboat.png" class="image" title="Long boat image"><img alt="Long boat image" src="/w/images/6/62/Longboat.png" decoding="async" width="98" height="98" /></a>
	View static image
Pattern type	Strict still life
Number of cells	7
Bounding box	4 × 4
Frequency class	6.6
Static symmetry	Unspecified
Discovered by	JHC group
Year of discovery	1970
Rules
Outer-totalistic rules	B/S23 – B3678/S012345678
# of rules	211 = 2048
Isotropic rules	B/S2ce3cn – B2-ae34-e5-c678/S012345678
Glider synthesis
Fewest gliders	3
Catagolue-generated RLE	synthesis
Uploaded synthesis RLE	longboat_synth.rle
Pattern files
Plaintext	longboat.cells
RLE	longboat.rle
Identifiers
apgcode	xs7_25ac
Pentadecathlon ID	7.2

Long boat is a longer version of a boat that was discovered by the JHC group in 1970.^[1]

It can be trivially extended to form longer versions of the boat.

Gallery

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

Commonness

The long boat is the eighth most common still life in Achim Flammenkamp's census, being less common than ship but more common than ship-tie.^[2]. It is also the tenth most common object on Adam P. Goucher's Catagolue. It is the second most common 7-bit still life, being less common than the loaf but more common than eater 1.^[3]

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 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

↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
↑ "Life Credits". Mark D. Niemiec. Retrieved on June 12, 2011.
↑ MathAndCode (December 12, 2020). Re: Still Life Synthesis Thread (discussion thread) at the ConwayLife.com forums

External links

Long boat at the Life Lexicon

Long boat at Adam P. Goucher's Catagolue

The 4 seven-bit still-lifes at Mark D. Niemiec's Life Page

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

[1] Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.

[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 June 24, 2016.

[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

[1]

[2]

[3]

[4]

[5]