Long barge

Long barge
x = 5, y = 5, rule = B3/S23 bo$obo$bobo$2bobo$3bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C Still life
View static image
Pattern type	Strict still life
Number of cells	8
Bounding box	5×5
Frequency class	11.8
Discovered by	JHC group
Year of discovery	1970
Rules Outer-totalistic rules B/S23 – B35678/S012345678 Important rules Conway Life, HighLife # of rules 212 = 4096 Isotropic rules B/S2c3c – B2-e34-e5678/S012345678
Glider synthesis Fewest gliders 3 Catagolue-generated RLE longbarge_synth.rle Uploaded synthesis RLE longbarge_synth.rle
Pattern files Plaintext longbarge.cells RLE longbarge.rle
Identifiers apgcode xs8_25ak8 Pentadecathlon ID 8.9

Long barge is an 8-cell still life discovered by the JHC group in 1970. It is a long extension of a barge.

It can "eat" two domino sparks, such as those produced by pentadecathlon; said sparks can be replaced with blocks to form unix.

Commonness

Long barge is the fourteenth most common still life on Adam P. Goucher's Catagolue, being less common than eater 1 but more common than aircraft carrier. Among all still lifes with 8 cells, it is the third most common, being less common than mango but more common than long ship. It is also the nineteenth most common object overall on Catagolue. In Achim Flammenkamp's census, the long barge was also ranked fourteenth most common, again between eater 1 and aircraft carrier.

Occurrence

The barge is 7.5 times as common as the long barge, but the long barge is 12,000 times as common as the very long barge. In diagonal symmetries (including 8-fold symmetry), the long barge is the eleventh most common object, which makes it more common than the barge. Reactions which form the long barge are demonstrated below.

x = 18, y = 18, rule = B3/S23 b2o8b2o$o2bo6bo2bo$o2bo6bo2bo$b2o2b3o3b2o3b2o$4bo10bo$3bo10bo$3bo9bo$ 3bo9bo3$b2o8b2o$o2bo6bo2bo$o2bo6bo2bo$b2o2b3o3b2o2b2o$4bo9bo2bo$3bo9bo $3bo9bo$4bo9bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]

Long barges are usually formed by a symmetric or near-symmetric active region hitting a pond (click above to open LifeViewer) RLE: here Plaintext: here

Glider synthesis

All strict still lifes with a population of 20 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

External links

• Long barge at the Life Lexicon

• Long barge at Adam P. Goucher's Catagolue

• The 9 eight-bit still-lifes at Mark D. Niemiec's Life Page

• 14.598 at Heinrich Koenig's Game of Life Object Catalogs

• Long^4 barge at Adam P. Goucher's Catagolue

• 16.3111 at Heinrich Koenig's Game of Life Object Catalogs

• Long^5 barge at Adam P. Goucher's Catagolue

• 18.17791 at Heinrich Koenig's Game of Life Object Catalogs

• Long^6 barge at Adam P. Goucher's Catagolue