Two blockers hassling R-pentomino

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Two blockers hassling R-pentomino
x = 30, y = 14, rule = B3/S23 4b2o19bo$4o4b2o10b3ob2o2b2o$3ob2o2b2o10b4o4b2o$5bo18b2o4$7b2o12b2o$7b2o12b2o 2$18b3o$17bo$17bo2bo$18b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 3 GPS 8 ZOOM 21 Y 2 LOOP 72 WIDTH 800 HEIGHT 500 ]]
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Pattern type Oscillator
Number of cells 47
Bounding box 30 × 19
Period 72
Mod 36
Heat 34.1
Volatility 0.97
Strict volatility 0.70
Discovered by Robert Wainwright
Year of discovery 1990

Two blockers hassling R-pentomino[1] is a period-72 oscillator. It was the first known period 72 oscillator, discovered by Robert Wainwright in July 1990.[2]

It is made up of two blockers that hassle two blocks and an R-pentomino. It appears in many large guns such as the gunstars and new gun 2.

On January 12, 2016, Tanner Jacobi found a way to replace the blockers with still lifes.[3] Mark D. Niemiec found a 29-glider synthesis for this oscillator on December 1, 2018.[4] It has since been reduced to 24 gliders.

x = 26, y = 20, rule = B3/S23 9b2o4b2o$3bob2obobo4bobob2obo$3b2obobo8bobob2o$7b2o8b2o3$19b2o$19b2o$6b2o$5b2o9b3o$6bo8bo$3b3o9bo2bo$3bo2bo9b2o$5bo3$2b2o18b2o$3bo18bo$3o20b3o$o24bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 HEIGHT 360 THEME 6 LOOP 72 ZOOM 10 GPS 8 AUTOSTART ]]
Still life-supported oscillator, also named as Roseluck[5]
(click above to open LifeViewer)
x = 30, y = 21, rule = DoubleB3S23 4.2A19.A$4A4.2A.2B4.2B.3A.2A2.2A$3A.AC.BCAB.B4.B.BA2CAB3.2A$5.CB.B.B8.B.B.BCA$9.2B8.2B3$7.2A12.2C$7.2A12.2C$8.2B$7.2B9.3C$8.B8.C$5.3B9.C2.C$5.B2.B9.2C$7.B3$4.2B18.2B$5.B18.B$2.3B20.3B$2.B24.B! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 HEIGHT 360 THEME 6 LOOP 72 ZOOM 10 GPS 8 AUTOSTART ]]
The two variants overlaid; Roseluck restores the blocks by a different mechanism 12 generations later
(click above to open LifeViewer)

When supported by p6 thumbs instead, the higher clearance allows gliders to pass through where they would otherwise interfere with the blockers, allowing its use in the current smallest period-1656 glider gun (and, by filters, the smallest of periods 3312 and 6624 as well).[6]

x = 52, y = 28, rule = B3/S23 32b4o$23b2o6b2o2bo14b2o$23b2o5b2o2bo15b2o$31bo2bo$32b2o2$32b2o$31bo2b o$13bo16b2o2bo15b2o$12bo18b2o2bo14b2o$9b2o4b3o14b4o$7b2o2bo6bo$8b2o4b 2obo$15bobo$3b2o11bo$3b2o10b2o$15b2o2$4bo12bo$3bo14bo$2bo4bo6bo4bo$2b 3o3bo4bo3b3o$2o4b3o4b3o4b2o$bobo14bobo$bob6o4b6obo$2bo5bo4bo5bo16bo$3b 3o10b3o18bo$5bo10bo18b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 HEIGHT 360 THEME 6 GPS 36 LOOP 1656 ZOOM 10 AUTOSTART ]]
(click above to open LifeViewer)

References

  1. ↑ Life Oscillators and Pseudo-Oscillators at Mark D. Niemiec's Life Page (download pattern file: lg/47br2rp.rle)
  2. ↑ Dean Hickerson's oscillator stamp collection. Retrieved on May 15, 2009.
  3. ↑ Tanner Jacobi (January 12, 2016). Re: The Hunting of the New Herschel Conduits (discussion thread) at the ConwayLife.com forums
  4. ↑ Mark D. Niemiec (December 1, 2018). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  5. ↑ Jeremy Tan (December 1, 2018). Re: Thread For Your Useless Discoveries (discussion thread) at the ConwayLife.com forums
  6. ↑ the Catagolue pages for the smallest p1656, p3312 and p6624

External links

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