Middleweight spaceship

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Middleweight spaceship
3bo$bo3bo$o$o4bo$5o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ Y 1.5 TRACKLOOP 4 -1/2 0 THUMBSIZE 2 GPS 4 ]]
Pattern type Spaceship
Family XWSS
Number of cells 11
Bounding box 6 × 4
Frequency class 13.2
Direction Orthogonal
Period 4
Mod 2
Speed c/2
Speed (unsimplified) 2c/4
Heat 15
Discovered by John Conway
Year of discovery 1970

The middleweight spaceship (commonly abbreviated to MWSS) or (rarely) medium fish is the third most common spaceship after the glider and lightweight spaceship. It was found by John Conway in 1970 and travels at c/2 orthogonally. It can support various non-standard components, such as pushalong 1.

Construction

A three-sided, one-step 3-glider synthesis was recorded on Lifeline Volume 3, involving a glider hitting a pre-pre-block freshly made from a 2-glider collision.[1]

A number of different ways to construct a MWSS can be found in Mark Niemiec's glider synthesis database.[2]

There is a three-object one-glider seed for the middleweight spaceship,[3] shown below; the constellation of three blocks itself can be constructed with four gliders,[4] thus providing a 5-glider synthesis for the MWSS. There are also 14 matches for the middleweight spaceship in the octo3obj database.[5]

x = 14, y = 9, rule = B3/S23 obo$b2o$bo3$4bo$4b2o5b3o$3bobo5bo$12bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME Book AUTOSTART GPS 8 ZOOM 14 T 0 PAUSE 1 T 31 PAUSE 1 LOOP 32 ]]
3G synthesis for the MWSS (click above to open LifeViewer)
x = 9, y = 9, rule = B3/S23 bo5b2o$2bo4b2o$3o4$7b2o$b2o4b2o$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME Book AUTOSTART GPS 8 ZOOM 14 T 0 PAUSE 1 T 47 PAUSE 1 LOOP 48 ]]
A 3-block 1G seed for the MWSS[3] (click above to open LifeViewer)

Occurrence

See also: List of common spaceships

The MWSS occurred about one fourth as commonly as the LWSS in soups investigated by Achim Flammenkamp.[6] It is also the twenty-third most common object on Adam P. Goucher's Catagolue.[7]

There are 167 results in the octohash database, 1798 results in the octo3obj database,[8] and 182 results in the octo3g database with at least one escaping MWSS.

See also

References

  1. Robert Wainwright (September 1971). Lifeline, vol 3, page 6.
  2. The 1 eleven-bit spaceship at Mark D. Niemiec's Life Page (download pattern file: ss/11mw.rle)
  3. 3.0 3.1 codeholic (August 25, 2013). Re: Blockic Seeds (discussion thread) at the ConwayLife.com forums
  4. xs12_33z66y0cc at Adam P. Goucher's Catagolue
  5. Dave Greene (October 21, 2022). Re: Octohash fingerprints (discussion thread) at the ConwayLife.com forums
  6. "Spontaneous appeared Spaceships out of Random Dust". Achim Flammenkamp (December 9, 1995). Retrieved on August 18, 2011.
  7. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
  8. There is a collision with two escaping middleweight spaceships. The headerless RLE is 8b2o$8b2o5$9b2o$5b2o2b2o$5b2o$3o$5bo$4b2o$4bobo!

External links