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x = 105, y = 96, rule = B3/S23 bo$2bo$3o10$13bo$14bo$12b3o10$25bo$26bo$24b3o10$37bo$38bo$36b3o10$49bo $50bo$48b3o10$61bo$62bo$60b3o10$73bo$74bo$72b3o14b2o$90bo$88bo5b2o$88b 2o5bo$95bob2o$88b2o2b2obo2bo$88b2o3bob2o$93bo$92b2o$99b2o$85bo13bobo$ 86bo14bo$84b3o14bob2o$91b2o5b2obobo$91b2o5b2obobo$101bob2o$82b2o14b4o 2bo$81bobo14bo3b2o$81bo18b2o$80b2o19bo$99bo$99b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ WIDTH 480 HEIGHT 480 THUMBSIZE 2 ZOOM 8 GPS 30 LOOP 192 X 28 Y 26 ]]
Pattern type Stable reflector
Number of cells 70
Bounding box 25×22
Angle 90°
Repeat time 48
Period multiplier
Colour Colour-preserving
Discovered by Tanner Jacobi
Year of discovery 2017

The quadri-Snark is a period-multiplying colour-preserving signal conduit found by Tanner Jacobi in October 2017, producing one output glider for every four input gliders.[1] It is made by replacing one of the eaters in a tremi-Snark with a catalyst found using Bellman. The catalyst cause the formation of a tub which then requires an additional glider to delete. However, this adds 5 ticks to the repeat time, so that it becomes 48. If period quadrupling is needed with a colour-changing reaction, a CP semi-Snark, CC semi-Snark and the regular Snark can be used in series, or a period-multiplying Herschel conduit can be connected to a syringe and an appropriately chosen Herschel-to-glider converter.

The quadri-Snark was part of a series of new stable pulse dividers (the others being the tremi-Snark and the semi-cenarks) which collectively ranked third place in the Pattern of the Year 2017 competition on the ConwayLife.com forums, behind Tanner's p46 and the 2-engine Cordership.[2]

See also


  1. Tanner Jacobi (October 24, 2017). Re: Thread For Your Bellman Finds (discussion thread) at the ConwayLife.com forums
  2. Dave Greene (February 19, 2018). Re: Pattern of the Year 2017 -- votes (discussion thread) at the ConwayLife.com forums

External links