#C four Snark catalyst variants
#C Top: original variant by Mike Playle
#C Left: Shannon Omick (better clearance on a diagonal)
#C Right: Heinrich Koenig (better clearance on a different diagonal)
#C Bottom: Simon Ekström (better clearance on two diagonals)
x = 51, y = 52, rule = B3/S23
20b2o$20bobo$22bo4b2o$18b4ob2o2bo2bo$18bo2bobobobob2o$21bobobobo$22b2o
bobo$26bo2$12b2o$13bo7b2o$13bobo5b2o$14b2o25bo$39b3o$38bo$38b2o3$46b2o
$24b2o21bo$24bo22bob2o$14b3o8b3o11b2o4b3o2bo$4bo11bo10bo11b2o3bo3b2o$
2b5o8bo5b2o21b4o$bo5bo13bo8b2o15bo$bo2b3o12bobo7bobo12b3o$2obo15b2o8bo
13bo$o2b4o21b2o14b5o$b2o3bo3b2o11bo22bo2bo$3b3o4b2o11b3o22b2o$3bo22bo$
2obo21b2o$2ob2o3$11b2o$12bo$9b3o$9bo25b2o$28b2o5bobo$28b2o7bo$37b2o2$
24bo$23bobob2o4b2o$23bobobobo2bo2bo$22b2obobobo3b2o$23bo2b2ob4o$23bo4b
o3bo$24b3obo2bo$26bobobo$29bo!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ THUMBLAUNCH THUMBSIZE 2 ZOOM 8 HEIGHT 480 THEME Book GRID GRIDMAJOR 0 STARTFROM 232 ]]
Four Snark catalyst variants: top: Mike Playle (original variant); left: Shannon Omick (better clearance on a diagonal); right: Heinrich Koenig (better clearance on a different diagonal); bottom: Simon Ekström (better clearance on two diagonals) (click above to open LifeViewer) RLE:herePlaintext:here
The base reaction was discovered by Dietrich Leithner about 1998, but it consumed another block.[2] A catalyst that could restore the block was found with Bellman, a program for searching catalytic reactions developed by Mike Playle. Prior to that, some attempts like p4 reflector were made with periodic sparkers.
While the repeat time is 43, a continuous period-38 stream triples the period to 114, while a continuous period-41 stream quadruples the period to 164. A period-42 stream creates an extraneous honey farm, which can be deleted with a block, doubling the period to 84; this was used in a previous version of the smallest period-84 glider gun.