Karel's p28

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Karel's p28
x = 36, y = 36, rule = B3/S23 10b2o12b2o$10b2o12b2o5$12b2o8b2o$11bo2bo6bo2bo$11bo12bo$11bo12bo$2o10b o10bo10b2o$2o5b3o16b3o5b2o$6bo3bo14bo3bo$6bo22bo$7bo20bo7$7bo20bo$6bo 22bo$6bo3bo14bo3bo$2o5b3o16b3o5b2o$2o10bo10bo10b2o$11bo12bo$11bo12bo$ 11bo2bo6bo2bo$12b2o8b2o5$10b2o12b2o$10b2o12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 7 ZOOM 8 LOOP 28 ]]
Pattern type Oscillator
Number of cells 88
Bounding box 36×36
Period 28
Mod 28
Heat 106.3
Volatility 0.97
Strict volatility 0.97
Discovered by Karel Suhajda
Year of discovery 2007

Karel's p28 is a period-28 oscillator discovered by Karel Suhajda on June 12, 2007.[1] Other than sharing blocks, two of these oscillators can interact at two ships.

The first known semi-natural appearance of this oscillator was in December 2014, in a symmetric soup found by Dongook Lee using apgsearch.[2] 1 in 56 million symmetric soups in the correct symmetry form a Karel's p28. A period-56 LCM consisting of a Karel's p28 interacting with four figure eights has occurred seminaturally; this is the only p56 oscillator to appear from soup so far.

A 46-glider synthesis of this oscillator was found by Jeremy Tan on January 5, 2020.[3]


x = 61, y = 61, rule = B3/S23 10b2o12b2o$10b2o12b2o5$12b2o8b2o$11bo2bo6bo2bo$11bo12bo$11bo12bo$2o10b o10bo10b2o$2o5b3o16b3o5b2o$6bo3bo14bo3bo$6bo22bo$7bo20bo7$7bo20bo$6bo 22bo$6bo3bo14bo3bo$2o5b3o16b3o5b2o$2o10bo10bo10bobo12b2o$11bo12bo10b2o 12b2o$11bo12bo$11bo2bo6bo2bo$12b2o8b2o2$37b2o8b2o$36bo2bo6bo2bo$36bo 12bo$10b2o12b2o10bo12bo$10b2o12bobo10bo10bo10b2o$25b2o5b3o16b3o5b2o$ 31bo3bo14bo3bo$31bo22bo$32bo20bo7$32bo20bo$31bo22bo$31bo3bo14bo3bo$25b 2o5b3o16b3o5b2o$25b2o10bo10bo10b2o$36bo12bo$36bo12bo$36bo2bo6bo2bo$37b 2o8b2o5$35b2o12b2o$35b2o12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 WIDTH 500 HEIGHT 500 GPS 7 AUTOSTART ]]
Two copies of this oscillator interacting at two ships
(click above to open LifeViewer)
RLE: here Plaintext: here

See also


  1. Jason Summers' all-osc pattern collection.
  2. Dongook Lee (December 19, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  3. Jeremy Tan (January 5, 2020). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums

External links

  • 88P28.1 at Heinrich Koenig's Game of Life Object Catalogs