Dueling banjos

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Dueling banjos
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 ]] #C [[ AUTOSTART GPS 12 LOOP 24 THUMBSIZE 3 ZOOM 16 HEIGHT 480 ]]
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

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.

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]

Related patterns

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]


x = 40, y = 31, rule = B3/S23 5b2ob2o15b2ob2o$5b2obo17bob2o$8bo5bo5bo5bo$8b2o4b2o3b2o4b2o$14bobobobo $3bobo9b2ob2o13b3o$b3ob3o24b6o$o7bo23bob3obo$2ob4obo22bo3bob2o$bo3bo 25b4ob4o$bobo2b2o4b2obo3bob2o6b2o4bob3o$2bobob2o5b3o3b3o5b2obob2obo2b 2o$3bob3o6bo5bo5b2o2bob2obob2o$5b3o18b3obo4b2o$5b3o18b4ob4o$5b3o19b2ob o3bo$6b2o19bob3obo$7bo20b6o$5bobobo4b3o13b3o$4bobob2o12bobo$4bobo6bobo bo5b2o$5b2o4b3obob3o3bo$10bo5bo3bo$9bobob2o2b2obo$9bob2o2b2o2bo$8b2o4b o2b2o9bobo$6bo2bobobo2bo12b2o$6b2o2b2ob4o12bo$12bo$12bobo$13b2o! #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 ]]
Period 24 gun based on dueling banjos
(click above to open LifeViewer)
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 ]]
Original dueling banjos tetramer from Catagolue
(click above to open LifeViewer)
x = 71, y = 67, rule = B3/S23 10b2ob2o15b2ob2o$10b2obo4b2o5b2o4bob2o$13bo2bo3b2ob2o3bo2bo$13b2obo11b ob2o6bo$16bo11bo8b3o$8bobo6bo3bobo3bo7b2o3bo$6b3ob3o5b3o3b3o8b3o2b2o$ 5bo7bo5bo5bo14bobo$6bob6o3b3o5b3o4b2o2b4ob3o$6b2o4bo4b3o5b3o4b2obo4bo 3bo$8bo3b2o4b2o5b2o4bobobob2obo3b2o$7bobo2bobo5bo3bo5b2o3bob2obobobo$ 8bo2bo6bo2bobo2bo4bo3bo4bob2o$11bo3bobo3bobo3bo4b3ob4o2b2o$11bo3bo2bo 2bobo2bo6bobo16bo3bo$11bo6b3o3b3o7b2o2b3o10bobobobo$11bo2bo20bo3b2o11b 2ob2o$12bo7bo15b3o$10bobobo5bo16bo$9bobob2o33b2o9b2o$9bobo6bo3bo7bo17b ob4ob4obo$10b2o4b3obob3o6bo17bo3bobo3bo$15bo3b2o4bo3b3o17bo3bobo3bo$ 15bob2o2b2obobo23b3o3b3o$16bo2b2o2b2obo$17b2o2b2obob2o$11b3o5bo2bobobo 2bo6bo$10b6o3b4ob2o2b2o7bo4bo2bo20bo2bo$10bob3obo6bo11b3o8bo23bo$9bo3b ob2o4bobo7b2o9bo3bo19bo3bo$9b4ob4o3b2o9b2o9b4o20b4o$7b2o4bob3o13bo$5b 2obob2obo2b2o$4b2o2bob2obob2o17b2o$4b3obo4b2o18b2o$4b4ob4o12b2o8bo$2o 3b2obo3bo13b2o25b2o$2o3bob3obo13bo26bobo$6b6o40bo$4o4b3o29b2o4b2o2b2ob 4o$o2bo35b2o5bo2bobo4bo$19b2o5b2o13bo6b2obob2o2b2o$20b2o5bo21bobo3b2o 2bo$10bo8bo5bo23bobob2o2b2obo$10b2o11b4o23bo4bo4bo$2b3o6b2o9bo4bo2b2o 14b2o3b3obob3o4b2o$3bobo4b2o9bob2ob2o2bo9b2o3b2o6b2ob2o6bobo$4b2o15bo 2bo3b2o2bo6bo2bo4bo13b2obobo$20b2obo2b2o2b5o3bobobo18bobobo$4b2o12bo4b obobobo5bobo2bob2o19bo$3bobo4b2o6bob2o2bo2bobob2ob2ob2obo3bo17b2o$2b3o 6b2o5bo3bobob2obob2obo5b2ob3o15b3o$10b2o8b2obobo3bo5bobobo3b3o15b3o$ 10bo10bobobo3bob3obo2b2o3b3o4bo5bo4b3o$21bo2bo5b2o2b2o7b3o3b3o3b3o3b3o 3bo$22b2o9bobo2bob2o2bo3bo2b2ob2o2bo3b2o2bobo$o2bo14b2o8b3ob2ob4obob2o 4b3o5b3o7bo2bo$4o3b2o10bo8bo2bo3bo3b2obo20bo$6bo3b9o10bobob2ob2o3bo2bo 18b6obo$2o4bobob7o2b3o6b2ob2obobob2obob2o17bo7bo$2o3b2ob2o2b4o2bo2bo 18bobo20b3ob3o$8bo2bo7b2o19bobo8b2ob2o9bobo$5b2obobobo28bo7b2obobob2o$ 6bo4bo32b2o3bo7bo3b2o$6bob3o33bo4b3o3b3o4bo$7b2o32b2obo17bob2o$41b2ob 2o15b2ob2o! #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 ]]
Period 48 LWSS gun using three of the
dueling banjos p24 glider guns
(click above to open LifeViewer)

References

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

External links