Period-74 glider gun

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A period-74 glider gun is any glider gun with true period 74.

2003

x = 113, y = 91, rule = B3/S23 64bo7bob2ob2o$62b3o7b2obobobo$46bo14bo16bo$46b3o12b2o$49bo17b2o33bo$ 48b2o16b5o29b3o$65bobob2o6b2o20bo$65bo5bo4b2ob2o18b2o7b2o$49b2o15bo4b 2o4bo2bo27bo$49b2o18bobo5bo2bo25bobo$69b3o6b2o26b2o$69bobo31bo$102bobo $97bo5bo$57bo37bobo3b2o$56b3o36bobo3b2o$55b2o2bo5b2o34b2o$59bo5bo20b2o 23bo$40b2ob2o2b2o9bo8bo19bo22bobo$41bobo2bobo5bo11b2o16b3o8b2o14bo$32b o7bo3b2o8bobo5b2o20bo11bo$20bo11b3o6b2obo9b2o6bo30b3o$18b3o14bo6bobo2b o15b3o27bo$2bo14bo16b2o6bobobobo16bo$2b3o12b2o24b2ob2o60b2o$5bo8bo93bo bo$4b2o7b2o95bo$13bobo25b2o2b2o63b2o$12b2o4b2o21b2o2b2o45bob2o2b2o$5b 2o6b3o3b2o18bo6b2o44b2obo4b2o3bo$5b2o6bob2ob2o4b2o12bo7bo55b2obo$15b4o 5b2o13b2ob2ob2o50bo7bo$41bo3b2o51bo3bo$99bo$100bobo$61b2o36b2o3bo$61b 2o37bo3b2o$21b2o32b2o48bo$21bo33b2o44bo2bo$23bo78b3o6b2o$22b2o87bo$18b 2o37b2o50bobo$18bo31b2o5b2o50b2o$19b3o28b2o$21bo2$91bo$61b2o28b3o$2b2o 50b2o5b2o31bo$bobo50b2o37b2o$bo87b2o$2o6b3o78bo$8bo2bo44b2o33bo$7bo48b 2o32b2o$7b2o3bo37b2o$8bo3b2o36b2o$10bobo$13bo$10bo3bo51b2o3bo$7bo7bo 50b2ob2ob2o13b2o5b4o$7bob2o55bo7bo12b2o4b2ob2obo6b2o$7bo3b2o4bob2o44b 2o6bo18b2o3b3o6b2o$13b2o2b2obo45b2o2b2o21b2o4b2o$b2o63b2o2b2o25bobo$2b o95b2o7b2o$2bobo93bo8bo$3b2o60b2ob2o24b2o12b3o$47bo16bobobobo6b2o16bo 14bo$19bo27b3o15bo2bobo6bo14b3o$17b3o30bo6b2o9bob2o6b3o11bo$16bo11bo 20b2o5bobo8b2o3bo7bo$bo14b2o8b3o16b2o11bo5bobo2bobo$obo22bo19bo8bo9b2o 2b2ob2o$bo23b2o20bo5bo$10b2o34b2o5bo2b2o$10b2o3bobo36b3o$10b2o3bobo37b o$9bo5bo$8bobo$9bo31bobo$5b2o26b2o6b3o$4bobo25bo2bo5bobo18b2o$4bo27bo 2bo4b2o4bo15b2o$3b2o7b2o18b2ob2o4bo5bo$13bo20b2o6b2obobo$10b3o29b5o16b 2o$10bo33b2o17bo$50b2o12b3o$35bo15bo14bo$36bo11b3o$34b3o11bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 ZOOM 6 WIDTH 800 HEIGHT 700 THEME Book GPS 30 STARTFROM 74 ]]
Snaked p74 gun (Karel Suhajda, 1 May 2003),[1] bounding box 113 × 91 (10283 cells)
(click above to open LifeViewer)

Many of first known guns above period 62 were built using Herschel track technology. Shown above is a p74 glider gun by Karel Suhajda in 2003. It is a 888-tick loop with 12 signals in the loop. The loop is composed of two instances of R64, four instances of L112 and two instances of L156. The shown form is a single-barreled pseudo period 74 gun. A double-barreled true period 74 gun can be obtained by letting both FNGs of input Herschels of L156 conduits escape.

2015

In March 2015, a smaller gun was assembled by Chris Cain, after the discovery that the syringe can be overclocked at period 74.[2][3][4] A smaller syringe-based gun was found in May 2015.[5]

x = 72, y = 74, rule = B3/S23 28bo11b2o$27bobo10b2o$19bo3b2o2bobo$10b2o6bobo2bo2b2ob2o$10b2o6bobo3bo bo$10b2o7bob4o2bob2o$9b3o9bo3bobob2o$9bobo8bo3bobo$8bo2bo7bo3bobo$8b3o 8b2o3bo$8b2o$10b2o$9b2obo16b2o$8bo18b2ob2o$7bo3b2o14bo2bo$8b3o16bo2bo 6b3o7b2o$8b2o18b2o7bo8bo2bo$11bo26bo8b2obo$2o7b2o39bo$2o7b2o39b2o$5b2o 2b2o24b2o$9b2o25bo$4b3o26b3o$6b4o11b2o10bo$8b3o10bobo$8bob2o11bo$7b2o 2bo11b2o$7b2ob2o$8bobo$9bo4$56b2o$56bobo$56bo6$62bo$61bobo$61bo2bo$63b o2$67b2o$23bo23b2o17bo2bo$24b2o22bo17bobo$23b2o23bobo16bo$38bo10b2o12b 3o$36b3o24b2o$35bo$35b2o16b2o$20b2o30bo2bo14b2o$21bo30bo2bo14b2o$21bob 2o26b5o$22bo2bo22b2ob2o$23bobo24bo$32b2o$25bobo2bo2bo$26bo2b2o4bo$29b 2o6bo$29bo2b2ob3o$29bo3b5o9bo3b2o$29bo16bobo3bo$33bo11bobo3bo$30bo2bo 7b2obobo3bo$30b3o8b2obo2b4obo5b2o$45bobo3bobo5bo$41b2ob2o2bo2bobo2b3o$ 42bobo2b2o3bo3bo13bo$30b2o10bobo26bo$30b2o11bo25b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 ZOOM 6 WIDTH 600 HEIGHT 600 THEME Book GPS 30 STARTFROM 74 ]]
Overclocked syringe based p74 gun,[4] bounding box 72 × 74 (5328 cells)
(click above to open LifeViewer)
x = 66, y = 55, rule = B3/S23 41bo11b2o$40bobo10b2o$32bo3b2o2bobo$31bobo2bo2b2ob2o$17b2o12bobo3bobo$ 18bo13bob4o2bob2o$18bobo13bo3bobob2o$19b2o12bo3bobo$23b2o7bo3bobo$23b 2o7b2o3bo$5b2o16bo$5b2o35b2o$21b3o16b5o$39bo4bo$39bo2b3o5b2o$39b2o2bo 6bobo7b2o$41b2o7bo8bo2bo$2o20bo37b2obo$2o21b2o38bo$63b2o$17bo30b2o$16b 2o31bo$15b2obo27b3o7bo$16bobo14b2o11bo8bobo$17b2o14bo21bo2bo$34b3o20bo $36bo$61b2o$17bo23b2o17bo2bo$18b2o22bo17bobo$17b2o23bobo16bo$32bo10b2o 12b3o$30b3o24b2o$29bo$29b2o16b2o$14b2o30bo2bo14b2o$15bo30bo2bo14b2o$ 15bob2o26b5o$16bo2bo22b2ob2o$17bobo24bo$26b2o$19bobo2bo2bo$20bo2b2o4bo $23b2o6bo$23bo2b2ob3o$23bo3b5o9bo3b2o$23bo16bobo3bo$27bo11bobo3bo$24bo 2bo7b2obobo3bo$24b3o8b2obo2b4obo5b2o$39bobo3bobo5bo$35b2ob2o2bo2bobo2b 3o$36bobo2b2o3bo3bo13bo$24b2o10bobo26bo$24b2o11bo25b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 ZOOM 6 WIDTH 600 HEIGHT 600 THEME Book GPS 30 STARTFROM 74 ]]
A smaller syringe-based gun,[5] bounding box 66 × 55 (3630 cells)
(click above to open LifeViewer)


2022

An even smaller gun was found by Nora Brown in 2022.[6][7] This was the smallest known true period 74 glider gun until the completion of Mitchell Riley's partial in August 2024.

x = 51, y = 50, rule = B3/S23 20b2o$20b2o5b2o$28bo$28bob2o$13b2o14bobo$12bo2bo15bob2obo$12bob2o14b2o bob2o$11b2o$10bo3b2o$11b3o2bo$14b2obo15b2o6bo$13bo2bo16b2o5bobo$13b2o 25bob3o$5b2o30b2obo4bo$6bo30bobobobobo$5bo4b2o9bo17bobob2o4b2o$5b2o3b 2o9bo16bobo8bo$21bo17bo7bobo$3b4o40b2o$3bo2bo14b2o$4bo17bo$b3o26bob3o$ bo27b2o$24b2o$23bo2bo$23bo2bo$24b2o$19b2o$2o13b3obo$2o25bo17b2o$27b2o 14bo2bo$43b3o$10bo17bo$9bobo16bo9b2o3b2obob2o$5b2obobo17bo9b2o4bob2obo $4bobobobobo31bo$4bo4bob2o30b2o$5b3obo25b2o$7bobo5b2o16bo2bo$8bo6b2o 15bob2o$33bo2b3o$34b2o3bo$37b2o$13b2obob2o14b2obo$13bob2obo15bo2bo$18b obo14b2o$18b2obo$21bo$21b2o5b2o$28b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 ZOOM 10 WIDTH 800 HEIGHT 700 THEME Book GPS 15 AUTOSTART KILLGLIDERS ]]
The former smallest known true period 74 glider gun,[6] bounding box 51 × 50 (2550 cells)
(click above to open LifeViewer)

2024

The smallest currently known true period 74 glider gun, partial by Mitchell Riley and completed by Carson Cheng.[8]

x = 49, y = 43, rule = B3/S23 17bo$17b3o$15b2o3bo$14bo3b2obo$14b4obobo2bo$22b3o$12b3obob4o$11bo2bob 2obo2bo$11b2o8b2o$39bo$6bo31bobo$6b3o29bob3o$9bo25b2obo4bo$8b2o25bobo bobobo$37bobob2o4b2o$36bobo8bo$37bo7bobo$45b2o2$13bo20bo$12bobo18bobo $11b2o22b2o$2o10bobo18bobo$2o11bo20bo3$10bo$9bobo$5b2obobo$4bobobobob o25b2o$4bo4bob2o25bo$5b3obo29b3o$7bobo31bo$8bo$25b2o8b2o$25bo2bob2obo 2bo$26b4obob3o$23b3o$23bo2bobob4o$26bob2o3bo$27bo3b2o$28b3o$30bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 ZOOM 12 WIDTH 800 HEIGHT 700 THEME Book GPS 15 AUTOSTART KILLGLIDERS ]]
The smallest known true period 74 glider gun,[8] bounding box 49 × 43 (2170 cells). Originally found with larger chucklebait variants
(click above to open LifeViewer)

See also

References

  1. ↑ guns1j-20121211.zip/p00074.lif
  2. ↑ Chris Cain (March 21, 2015). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  3. ↑ Chris Cain (April 3, 2015). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  4. ↑ 4.0 4.1 "Add p74 and p75". ceebo/glider_guns (April 3, 2015).
  5. ↑ 5.0 5.1 "Smaller p74". ceebo/glider_guns (May 10, 2015).
  6. ↑ 6.0 6.1 Nora Brown (November 17, 2022). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums
  7. ↑ Dave Greene (November 18, 2022). Re: NewLifeCA Back Issues (discussion thread) at the ConwayLife.com forums
  8. ↑ 8.0 8.1 carsoncheng (August 29, 2024). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums
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