Dueling banjos

Dueling banjos is a period-24 oscillator found (in tetramer form, via apgsearch) by Apple Bottom on January 10, 2019. It consists of two B-heptominos being hassled by two eater 1s and two block on tables.

Dueling banjos
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 20, y = 25, rule = B3/S23 16b2o$16b2o2$16b4o$2o14bo2bo$bo$bobo$2b2o5bo$8b2o$7b2o6b3o$8b2o4bobo$ 14b2o2$14b2o$8b2o4bobo$7b2o6b3o$8b2o$2b2o5bo$bobo$bo$2o14bo2bo$16b4o2$ 16b2o$16b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ AUTOSTART GPS 12 LOOP 24 THUMBSIZE 3 ZOOM 16 HEIGHT 480 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> File:Duelingbanjos.png <html></noscript></canvas></div></html>
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Pattern type Oscillator
Number of cells 62
Bounding box 25×20
Period 24
Mod 24
Heat 33
Volatility 0.86
Strict volatility 0.86
Discovered by Apple Bottom
Year of discovery 2019

Matthias Merzenich provided a monomer form which has cis-in, cis-out and trans isomers depending on the relative positions of the two blocks.[1]

Mark Niemiec posted a 19-glider synthesis of the oscillator on January 13th.[2]

Starting from an initial p24 gun by Tanner Jacobi,[3] Matthias Merzenich found a way to adjust the sparkers (HW emulator, 44P12.3 and pipsquirter 1) to produce a true period gun with a slightly smaller bounding box than the previous record-holder, p24 gun.[4] The population is somewhat larger, but this is not considered for most record-keeping purposes. The 44P12.3 and the pipsquirter 1 can each be placed in two possible orientations, allowing for the optimized p48 LWSS gun below.[5]


<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 40, y = 31, rule = B3/S23 5b2ob2o4b2o3b2o4b2ob2o$5b2obobo3b2o3b2o3bobob2o$8bo5bobobobo5bo$8bo2bo 11bo2bo$9bo15bo$3bobo7bob2ob2obo$b3ob3o5bo2bobo2bo$o7bo4b3o3b3o7b2o3bo $bob6o19bo2bobobo2bo$b2o4bo20bob2obob4o$3bo3b2o18b2o4bo$2bobo2bobo10bo 4bo3b4ob2ob2o$3bo2bo13bo7bobobobobo2bo$6bo3bo2b2o9bo3bo3bo2bo2b2o$6bo 3bo2b2o9bo6b2o$6bo6bo14b3obo2bo$6bo2bo11bo3bo4bo2b3o$7bo14bo4b2obobo$ 5bobobo10b3o5bobo2b3o$4bobob2o18bobo4bo$4bobo6b5o11bo$5b2o4b3obob3o$ 10bo4bo4bo6bo$10bob2o2bob2obo6bo$11bo2b2o3bobo4b3o$12b2o2bo2bob2o$14bo 4bobo2bo$14b4ob2o2b2o$18bo14bo$16bobo15bo$16b2o14b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 6 LOOP 2400 THUMBLAUNCH THUMBSIZE 3 THEME 6 ZOOM 10 HEIGHT 400 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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Period 24 gun based on dueling banjos
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RLE: here Plaintext: here
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 39, y = 39, rule = B3/S23 10b2o15b2o$10bo17bo$7b2obo5bo5bo5bob2o$7b2ob2o4b2o3b2o4b2ob2o$16bobobo bo$17b2ob2o2$2b2o31b2o$2b2o31b2o2$4o10b2obo3bob2o10b4o$o2bo11b3o3b3o 11bo2bo$16bo5bo2$10bo17bo$10b2o15b2o$2b3o6b2o13b2o6b3o$3bobo4b2o15b2o 4bobo$4b2o27b2o2$4b2o27b2o$3bobo4b2o15b2o4bobo$2b3o6b2o13b2o6b3o$10b2o 15b2o$10bo17bo2$16bo5bo$o2bo11b3o3b3o11bo2bo$4o10b2obo3bob2o10b4o2$2b 2o31b2o$2b2o31b2o2$17b2ob2o$16bobobobo$7b2ob2o4b2o3b2o4b2ob2o$7b2obo5b o5bo5bob2o$10bo17bo$10b2o15b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 12 LOOP 48 THUMBLAUNCH THUMBSIZE 3 THEME 6 ZOOM 10 WIDTH 480 HEIGHT 480 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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Original dueling banjos tetramer from Catagolue
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RLE: here Plaintext: here
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 69, y = 66, rule = B3/S23 10b2ob2o15b2ob2o$10b2obo5bo5bo5bob2o$13bo4b2o5b2o4bo$13b2o2bo9bo2b2o$ 18b2obobob2o$8bobo8b3ob3o11b2o$6b3ob3o23bobo$5bo7bo22b3o$6bob6o21bo$6b 2o4bo5bo7bo7bob4o$8bo3b2o3b4o3b4o4b2obo4bo$7bobo2bobo2bo3bobo3bo3bobob ob2obob3o$8bo2bo6bo2bobo2bo4b3obob2obobobo$11bo3bo2b3o3b3o8bo4bob2o$ 11bo3bo20b4obo6b2ob2o3b2ob2o$11bo28bo6bo5bobo5bo$11bo2bo22b3o12b2ob2o$ 12bo24bobo10bo7bo$10bobobo22b2o8bo2bob2ob2obo2bo$9bobob2o14bo18bo3bo3b o3bo$9bobo6b5o7bo18b2ob2ob2ob2o$10b2o4b3obob3o3b3o19bo2bobo2bo$15bo4bo 4bo25bobobobo$15bob2o2bob2obo25bo3bo$16bo2b2o3bobo$17b2o2bo2bob2o7bo$ 12b2o5bo4bobo2bo6bo$8b2obobo5b4ob2o2b2o4b3o3bo2bo20bo2bo$9bobo11bo20bo 23bo$9bobo7b2o2bo16bo3bo19bo3bo$8b2o3bob2obob3o7b2o9b4o20b4o$7bo3b4obo bo12b2o$8b3o3bo3bob3o7bo$11b4ob2o2bo2bo$8b2obo8bobo12b2o14b2o$7bobo2bo 2b5obo12b2o14bobo$2o5bo3bo3bo4bo3b2o10bo13bo$2o6b3o6b3o5b2o17b2o2b2ob 4o$10bob4obo6bo19bo2bobo4bo$4o7b6o29b2obob2o2b2o$o2bo8b4o25b2o4bobo3b 2o2bo$26b2o12b2o5bobob2o2b2obo$18b2o7bo14bo5bo4bo4bo$6b3o10b2o4bo23b3o bob3o4b2o$4bo3b2o8bo4b4o12bo11b2ob2o6bobo$4bobo2b2o11bo4bo5bo4bobo18b 2obobo$3bo5bo11bob5o5b3o2bobo6b2o10bobobo$4b5o12bo6b2o6bobob2o4b2o13bo $20b2obobobo2bo2b2obobo3bo5bo5bo5b2o$4b5o11bo2bobobob2o2bo4b2ob3o11bo 3b3o$3bo5bo11b2obo2bo6b3o4b3o10b2o3b3o$4bobo2b2o9bo3bob2ob2o2b2obo4b3o 10bo4b3o$4bo3b2o10b2obobo3bo4bobobo2b3o4bo10b3o3bo$6b3o12bobo2b2o2b3ob ob2obo2bo4bobo10b2o2bobo$21bo2bobo8bo4b2o22bo2bo$22b2o2bo3b4obob2obo 20bo$o2bo14b2o6b2o2bo2bobobo2bo20b6obo$4o3b2o10bo14bo3b2o8bo5bo5bo7bo$ 6bo3b9o28b3o3b3o5b3ob3o$2o4bobob7o2b3o24bo2b2ob2o2bo6bobo$2o3b2ob2o2b 4o2bo2bo21b2o13b2o$8bo2bo7b2o21bo6b2ob2o6bo$5b2obobobo29bob2o11b2obo$ 6bo4bo27b2obo5b2o3b2o5bob2o$6bob3o28b2ob2o5bo3bo5b2ob2o$7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 12 LOOP 48 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 6 WIDTH 480 HEIGHT 480 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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Period 48 LWSS gun using three of the
dueling banjos p24 glider guns
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RLE: here Plaintext: here
gollark: ~skip
gollark: Wow, what wondrous memetic hazards.
gollark: <@332271551481118732> osmarks.net
gollark: There is in fact no escape.
gollark: Gæh?

References
  1. Matthias Merzenich (January 11, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  2. Mark D. Niemiec (January 13, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  3. Tanner Jacobi (January 12, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  4. Matthias Merzenich (January 13, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  5. Adam P. Goucher (January 14, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
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