Simkin glider gun

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Simkin glider gun
2o5b2o$2o5b2o2$4b2o$4b2o5$22bo3bo$21bo4b2o$20b2o5b2o2b2o$21b2o4bo3b2o$ 22bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 ZOOM 12 GPS 20 HEIGHT 480 ]]
Pattern type Gun
Number of cells 29
Bounding box 33 × 14
Period 120
Barrels 2
Discovered by Michael Simkin
Year of discovery 2015

Simkin glider gun is a glider gun found by Michael Simkin on April 28, 2015.[1] It consists of a Herschel running in a loop made of two B60 conduits, producing infinite copies of the first natural glider. In terms of its 36 cells (if one of the two streams is suppressed by an eater 1) it is the smallest known gun, sharing the record with the Gosper glider gun. In the 29-cell double-barrelled form (shown in the infobox), as well as the pseudo-period boat-bit form, it is the absolute record holder. Its smallest known predecessor has only 21 cells.[2]

The day of its discovery, Chris Cain used it to create the Sawtooth 181.[3]

The Simkin glider gun ranked second place in the Pattern of the Year 2015 competition on the forums, behind the syringe.[4]


x = 33, y = 21, rule = B3/S23 2o5b2o$2o5b2o2$4b2o$4b2o5$22b2ob2o$21bo5bo$21bo6bo2b2o$21b3o3bo3b2o$26b o4$20b2o$20bo$21b3o$23bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 Y -2 GPS 20 AUTOSTART ]]
36-cell single-barreled gun
(click above to open LifeViewer)
RLE: here Plaintext: here
x = 33, y = 22, rule = B3/S23 5bob2o$5b2obo4$7bo$6bo2bo$2o3bo4bo$2o4b2o2bo$4b2o2b3o6$7b2o18b2o$27b2o 2$24b2o5b2o$17bo6b2o5b2o$18bo$16b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 GPS 20 AUTOSTART ]]
Boat-bit form of the gun
(click above to open LifeViewer)
RLE: here Plaintext: here

See also


  1. Michael Simkin (April 28, 2015). Re: The Hunting of the New Herschel Conduits (discussion thread) at the forums
  2. praosylen (July 30, 2019). Re: Can confirm Fewest cell glide gun? (discussion thread) at the forums
  3. Chris Cain (April 28, 2015). Re: Smaller sawtooth (discussion thread) at the forums
  4. Alexey Nigin (February 11, 2016). Re: Pattern of the Year 2015 (Votes) (discussion thread) at the forums

External links