Cloverleaf interchange

Cloverleaf interchange
x = 13, y = 13, rule = B3/S23 4bo3bo4b$3bobobobo3b$3bobobobo3b$b2o2bobo2b2ob$o4bobo4bo$b4o3b4ob$13b$ b4o3b4ob$o4bobo4bo$b2o2bobo2b2ob$3bobobobo3b$3bobobobo3b$4bo3bo4b! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C Still life #C [[ THUMBSIZE 2 HEIGHT 480 ]]
View static image
Pattern type	Strict still life
Number of cells	56
Bounding box	13×13
Discovered by	Adam P. Goucher
Year of discovery	2016
Rules Outer-totalistic rules B/S23 – B378/S012345678 Important rules Conway Life # of rules 210 = 1024 Isotropic rules B/S2cik – B2ikn34-inw5-ry6-i78/S012345678
Glider synthesis Fewest gliders 10 Catagolue-generated RLE cloverleafinterchange_synth.rle
Pattern files Plaintext cloverleafinterchange.cells RLE cloverleafinterchange.rle
Identifiers apgcode xs56_g8861u0u1688gz8ll55o0o55ll8zx3430343

For other uses of "cloverleaf", see Cloverleaf (disambiguation).

Cloverleaf interchange (or fourfold racetrack-weld-racetrack) is a 56-cell still life exhibiting D8_1 symmetry.

While known for many years beforehand due to its ability to be hassled, it is notable due to a natural occurrence being found in the ash of a random asymmetric soup by Adam P. Goucher on August 12, 2016. This made it the single largest known still life to occur completely naturally, surpassing the previous record holder, the 46-cell professor; it had previously arisen semi-naturally in various higher symmetries, including C2_1, C4_1, D2_+1, D4_+1, D4_+2 and D4_x1. It has since been tied in C1 by another, unnamed 56-cell still life found by John Goodman in September 2021.

BlinkerSpawn found a 12-glider synthesis on the same day. GUYTU6J improved this to 10 gliders on February 5, 2020.

A cloverleaf interchange can be hassled by Carnival shuttles, like this:

x = 49, y = 49, rule = B3/S23 10b2obo21bob2o$14bo3bo11bo3bo$10bo7b2o9b2o7bo$11b2ob2o2bo11bo2b2ob2o$ 15bo2b2ob2o3b2ob2o2bo$14b2o7bobo7b2o$15bo3bo9bo3bo$20bob2ob2obo3$obo 43bobo$o2bo17b3ob3o17bo2bo$3bo41bo$o21bo3bo21bo$bobobo16bo3bo16bobobo$ 3b4o14b3ob3o14b4o3$b4o17bo3bo17b4o$2bobobo14bobobobo14bobobo$7bo13bobo bobo13bo$4bo6bo3bo3b2o2bobo2b2o3bo3bo6bo$4bo2bo3bob3o2bo4bobo4bo2b3obo 3bo2bo$5bobo3bo3bo3b4o3b4o3bo3bo3bobo2$5bobo3bo3bo3b4o3b4o3bo3bo3bobo$ 4bo2bo3bob3o2bo4bobo4bo2b3obo3bo2bo$4bo6bo3bo3b2o2bobo2b2o3bo3bo6bo$7b o13bobobobo13bo$2bobobo14bobobobo14bobobo$b4o17bo3bo17b4o3$3b4o14b3ob 3o14b4o$bobobo16bo3bo16bobobo$o21bo3bo21bo$3bo41bo$o2bo17b3ob3o17bo2bo $obo43bobo3$20bob2ob2obo$15bo3bo9bo3bo$14b2o7bobo7b2o$15bo2b2ob2o3b2ob 2o2bo$11b2ob2o2bo11bo2b2ob2o$10bo7b2o9b2o7bo$14bo3bo11bo3bo$10b2obo21b ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THUMBSIZE 2 ZOOM 8 WIDTH 600 HEIGHT 600 GPS 6 LOOP 12 ]]

(click above to open LifeViewer) RLE: here Plaintext: here

External links

• Cloverleaf interchange at Wikipedia

• Cloverleaf interchange at Adam P. Goucher's Catagolue