Period-8 sparkers

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This is a list of known period-8 sparkers. Period 8 is at the limit of JLS, WLS, and similar programs; while they can be found, it requires a good amount of luck and several months, and objects being searched for are not guaranteed to exist.

Dot sparkers and functional dot sparkers

6bobob$5bo4b$2o2bo4bo$2obo2bob2o$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
Blocker. Used as a corner dot spark. Can also be used as an obo spark in some circumstances. (click above to open LifeViewer)
RLE: here Plaintext: here
2bo2bobob$2obob3ob$bo6bo$2o5bob2$bo5b2o$o6bob$b3obob2o$bobo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
Kok's galaxy: A stronger corner dot spark, and sometimes has uses as a more complex spark in the generation before the one with the corner dots. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 27, y = 14, rule = B3/S23 o15bo$3o13b3o$3bo15bo$2bo15bo$2bo3bo11bo3bo2$2b2o3bo10b2o3bo$2bo2bobo 10bo2bobo$2bobobo11bobobo$4bobobo11bobobo$2bobo2b2o9bobob2obo$bob2o13b 2o5bo$bo23b2o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
58P8, sometimes called "Obscure p8". Works like a blocker, and can sometimes reduce guns' bounding boxes. Two stator variants are shown. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 12, y = 19, rule = B3/S23 2bo$2bo$b3o6bo$bobo3b3obo$ob3o2b2o2bo$bobo3bob2o$6b3o$5bo2bo$5bo$5bo$ 4b2obo2bo$b2obo2bo2bo$2bobob2obo$obobo2bobobo$2o2bo2bo2b2o$4b4o2$4b2o$ 4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
p8 T-nose by 2718281828 on February 13, 2019. Often used in situations with limited side clearance. (click above to open LifeViewer)
RLE: here Plaintext: here
2o10b$2o2b2o6b$5b2o5b$4bo2bo4b$7bo2b2o$5bobo2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
Coe's p8. The spark comes from the block in grin form. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 34, y = 23, rule = B3/S23 14bob2o$14b2obo$2o15bob2o8bo$2obo6b2o5bo2bo3b2o2bobo$4bo5bobob2ob2o5bo 3bobo$bo10bobobo2b4obo2b2o2b2o$2bob2o5b2o3bobo3bobobo2bobo$4b2o3b2obo 5bob2o2bob2obobo$9bobo3b2obo2b2obobo2bob2o$10bo2bo6bobo2b3o5bo$11b9o4b o3b2o3bo$33bo$11b9o4bo3b2o3bo$10bo2bo6bobo2b3o5bo$9bobo3b2obo2b2obobo 2bob2o$4b2o3b2obo5bob2o2bob2obobo$2bob2o5b2o3bobo3bobobo2bobo$bo10bobo bo2b4obo2b2o2b2o$4bo5bobob2ob2o5bo3bobo$2obo6b2o5bo2bo3b2o2bobo$2o15bo b2o8bo$14b2obo$14bob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
209P8. It is large but powerful, and is the only p8 middleweight sparker with side sparks. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 12, y = 17, rule = B3/S23 9bo$2o2bo5bo$bo2bobo4bo$3bobob2obo2$3b6o$2bo6bo$bo8bo$bobo4bobo$2obo4b ob2o$2bobo2bobo$2bo6bo$3bo4bo$4b4o2$5b2o$5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
50P8. Found by Josh Ball on June 12, 2013. (click above to open LifeViewer)
RLE: here Plaintext: here

Domino sparkers

Edgy domino sparks can sometimes be used as dots.

2o$2obo$4bo$bo$2bob2o$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
Figure eight. While it often fails, it's always worth checking; it's very small, and there are some situations where the figure eight is the only thing that works. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 12, y = 12, rule = B3/S23 6b2o$10b2o$5b2obo2bo$6bob3o$7bo$2bo4b4o$ob2o3bo2bo$o3b3ob2o$2b2obobo$ 3bobobo$bobob2o$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
36P8. It can be used when figure eight fails. Found by Achim Flammenkamp on August 26, 1994. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 14, y = 15, rule = B3/S23 6b2o$2b2o6b2o$bo10bo$bobo6bobo$2obob4obob2o$3bob4obo$2obo6bob2o$bobo2b 2o2bobo$bo2bob2obo2bo$2bob2o2b2obo$b2ob2o2b2ob2o2$b2o2b4o2b2o$obo2bo2b o2bobo$bo10bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
76P8. There are no side sparks, unlike 180P8. It can only be used if the active region recedes by generation 4. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 35, y = 20, rule = B3/S23 17b2o$6bo2bo2bo3bo2bob2o$6b7o2bob3obo$2o13bo6b3o$bo2b11ob6o2bo$bobo4bo 5bobobo4bo$2obobo4b2o3bo3b2o$o5bo2bo2bo4b2o8b5obo$b2ob2o6bo5b2o3bob2o$ 2bobo7bo8bo2bo9bo$2bobo7bo8bo2bo9bo$b2ob2o6bo5b2o3bob2o$o5bo2bo2bo4b2o 8b5obo$2obobo4b2o3bo3b2o$bobo4bo5bobobo4bo$bo2b11ob6o2bo$2o13bo6b3o$6b 7o2bob3obo$6bo2bo2bo3bo2bob2o$17b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
180P8: It is strong but large. It is much smaller than the similar 678P7, though, and it sometimes allows more complex sparks. This is a heavyweight sparker; unlike 76P8, there are side sparks. (click above to open LifeViewer)
RLE: here Plaintext: here
x = 7, y = 7, rule = B3/S23 3ob3o$bobobo2$bo3bo2$obobobo$2bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 AUTOSTART STOP 2 ]]
Smiley. While typically only good for LCMs, there might be a niche use elsewhere. (click above to open LifeViewer)
RLE: here Plaintext: here

See also