Die hard

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Die hard
Die hard image
Pattern type Methuselah
Number of cells 7
Bounding box 8×3
Lifespan 130 generations
L/I 18.6
Discovered by Unknown
Year of discovery Unknown

Die hard is a 7-cell methuselah (essentially a collision between a block and the traffic light sequence) that vanishes after 130 generations, which is conjectured to be the limit for vanishing patterns of 7 or fewer cells. Note that there is no limit for higher numbers of cells, as eight cells suffice to have a glider heading towards an arbitrarily distant blinker.

"Die hard" as a general term

Alternatively, "die hard" or "diehard" may refer to any methuselah that eventually vanishes. Soups in Conway's Game of Life lasting at least 500 generations before disappearing completely are reported by apgsearch versions v4.69 and above and referred to as "messless methuselahs" on Catagolue.[1]

As of early 2019, the longest-lasting diehard found in an asymmetric soup (and fitting inside a 16×16 bounding box) is a 1192-tick "C1" soup found by Rob Liston on March 6, 2019.[2] The longest-lasting symmetric diehard (fitting inside a 32×32 bounding box) is a 1583-tick "C4_4" soup found by carybe on February 26.[3]

x = 16, y = 16, rule = B3/S23 obobo2b5ob3o$2b3o2b2obob2obo$obobo2b2o2bob2o$o9bob2obo$4o4b2o3bobo$2bo b5o5bo$2b2o3bo3bo3bo$2bob2obobo3b2o$ob4obo2b2o2bo$3o6bobo$5b2ob2o2b2o$ obobob2ob2o3b2o$6bo2b3ob2o$3bo2b3ob3ob2o$obob4obo2b2obo$b4o2bob4ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 600 WIDTH 600 ]]
Asymmetric 1192-tick diehard (click above to open LifeViewer)
x = 32, y = 32, rule = B3/S23 ob2obo2bo2b4o2bo4bobob2ob3o$2ob3ob2ob4o2bob5obo4b2o$2ob2o7b3o4bobo2b3o bo2bo$2b2ob3obob6o2bo3b2ob6o$o2bo2b2obobob2ob2obobobob2o2b2o$ob5ob4o2b ob2o2bob3obobob2o$2bobob2o2b2ob2o3bobobo2b4o$4obo5b3obobob3o3bob2obo$ 3b3o2b2o2bo2bo5bobo2bo3b2o$2o3b2o2b8obobob2o2b3o$b2obo2b2o2bobob3o4bo 2b2o3bo$bo3b3obobob4ob5ob5ob2o$b4o2bo3b2o2b2o2bo2b3o3b4o$bo4bo2bobob2o 2b2ob3ob2ob5o$o3b2obo2bo2b6obobo2b5obo$bob3o3b4ob4ob6o3bo$3bo3b6ob4ob 4o3b3obo$ob5o2bobob6o2bo2bob2o3bo$5ob2ob3ob2o2b2obobo2bo4bo$4o3b3o2bo 2b2o2b2o3bo2b4o$2ob5ob5ob4obobob3o3bo$bo3b2o2bo4b3obobo2b2o2bob2o$3b3o 2b2obobob8o2b2o3b2o$2o3bo2bobo5bo2bo2b2o2b3o$bob2obo3b3obobob3o5bob4o$ 3b4o2bobobo3b2ob2o2b2obobo$2obobob3obo2b2obo2b4ob5obo$b2o2b2obobobob2o b2obobob2o2bo2bo$6ob2o3bo2b6obob3ob2o$o2bob3o2bobo4b3o7b2ob2o$b2o4bob 5obo2b4ob2ob3ob2o$3ob2obobo4bo2b4o2bo2bob2obo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 600 WIDTH 600 ]]
Symmetric 1583-tick diehard (click above to open LifeViewer)

In other rules

In HighLife, despite the instability of the traffic light sequence, the die hard still works, disappearing after 119 generations.


  1. Ian07. Re: apgsearch v4.0 (discussion thread) at the ConwayLife.com forums
  2. Ian07. Re: Soup search results (discussion thread) at the ConwayLife.com forums
  3. Ian07. Re: Soup search results (discussion thread) at the ConwayLife.com forums

External links