Fuse with two long tails

Fuse with two long tails
x = 4, y = 8, rule = B3/S23 2o$bo$o$obo$bobo$3bo$2bo$2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]]
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Pattern type	Strict still life
Number of cells	12
Bounding box	4 × 8
Frequency class	36.7
Static symmetry	.k (C2_4)
Discovered by	Robert Wainwright Everett Boyer
Year of discovery	1973
Rules Outer-totalistic rules B/S23 – B35678/S012345678 # of rules 212 = 4096 Isotropic rules B/S2-in3n – B2in34-jkr5678/S012345678
Glider synthesis Fewest gliders 6 Catagolue-generated RLE synthesis
Pattern files Plaintext fusewithtwolongtails.cells RLE fusewithtwolongtails.rle
Identifiers apgcode xs12_g8jdz56 Niemiec ID 12.47 Pentadecathlon ID 12.91

The fuse with two long tails is a 12-cell still life.

Construction

This still life was synthesised with 6 gliders by Tanner Jacobi on October 9, 2025. It was the longest holdout; since August 2024, it had been the only 12-cell still life without a synthesis in at most 6 gliders.

x = 29, y = 23, rule = B3/S23 13bo$12bo$12b3o$o$b2o$2o6$25b2o$13bo12bo$12bo12bo$12b3o10bobo$26bobo$8b3o17bo$3bobo2bo18bo$4b2o3bo17b2o$4bo$8bo$8b2o$7bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 450 THEME Book ZOOM 10 X 0 Y 0 AUTOSTART GPS 8 T 0 PAUSE 3 T 25 PAUSE 2 LOOP 26 ]] A 6G synthesis (click above to open LifeViewer)

x = 46, y = 33, rule = B3/S23 4bo$5bo$3b3o27bo$31b2o$32b2o9$35bo$33b2o$34b2o$42b2o$17bo25bo$18bo23bo $16b3o23bobo$43bobo$45bo$44bo$44b2o2$30b2o$29b2o$31bo$3o$2bo$bo18b3o$ 22bo$21bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 450 THEME Book ZOOM 10 X 0 Y 0 AUTOSTART GPS 8 T 0 PAUSE 3 T 12 PAUSE 1 T 42 PAUSE 1 T 61 PAUSE 2 LOOP 62 ]] A 7G synthesis (click above to open LifeViewer)

x = 47, y = 29, rule = B3/S23 27bo$12bobo12bobo4bo$7bo5b2o12b2o4bo$8bo4bo19b3o$6b3o$17bo$15bobo$16b 2o3$43b2o$44bo$43bo$43bobo$25b2o17bobo$26bo19bo$11b2o12bo9b2o8bo$12b2o 11b2o8bobo7b2o$11bo23bo4$7b2o$6bobo$8bo2$b2o$obo$2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 450 THEME Book ZOOM 10 X 0 Y 0 AUTOSTART GPS 8 T 0 PAUSE 3 T 20 PAUSE 1 T 29 PAUSE 1 T 37 PAUSE 1 T 64 PAUSE 2 LOOP 65 ]] A 9-glider conversion from snake (click above to open LifeViewer)

Occurrence

Among the 121 still lifes with 12 cells, this is the third rarest according to Catagolue.

There are no occurrences of this still life in final patterns of collisions in octohash, octo3obj or octo3g databases.

External links

• Fuse with two long tails at Adam P. Goucher's Catagolue
• 12.91 at Heinrich Koenig's Game of Life Object Catalogs