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.

Alternatively, "die hard" or "diehard" may refer to any methuselah that eventually vanishes. These are referred to as "messless methuselahs" by Catagolue and apgsearch.

For example, on January 7, 2019, a symmetric soup search run by Apple Bottom turned up a 31x31, 1340-tick diehard:

#C https://catagolue.appspot.com/object/messless_13h/b3s23 x = 31, y = 31, rule = B3/S23 bo2b6ob4ob4ob6o2bo$2obobo5bo3bo3bo5bobob2o$2bobobobobo2bo3bo2bobobobob o$bo2b2obobo5bo5bobob2o2bo$ob4obob3obo3bob3obob4obo$2ob3o4bobobobobobo 4b3ob2o$obo3b2o2bob7obo2b2o3bobo$o2b2obo2bobo3bo3bobo2bob2o2bo$obo5b2o bo7bob2o5bobo$o2b2o2b4o2bo3bo2b4o2b2o2bo$2bob3o2b2ob2obob2ob2o2b3obo$ 2o2bo2b2o2b2o2bo2b2o2b2o2bo2b2o$o4b2o3b2obo3bob2o3b2o4bo$obobobo2b2obo bobobob2o2bobobobo$o4b2o6b5o6b2o4bo$bobo2b2o2b2o2bobo2b2o2b2o2bobo$o4b 2o6b5o6b2o4bo$obobobo2b2obobobobob2o2bobobobo$o4b2o3b2obo3bob2o3b2o4bo $2o2bo2b2o2b2o2bo2b2o2b2o2bo2b2o$2bob3o2b2ob2obob2ob2o2b3obo$o2b2o2b4o 2bo3bo2b4o2b2o2bo$obo5b2obo7bob2o5bobo$o2b2obo2bobo3bo3bobo2bob2o2bo$o bo3b2o2bob7obo2b2o3bobo$2ob3o4bobobobobobo4b3ob2o$ob4obob3obo3bob3obob 4obo$bo2b2obobo5bo5bobob2o2bo$2bobobobobo2bo3bo2bobobobobo$2obobo5bo3b o3bo5bobob2o$bo2b6ob4ob4ob6o2bo! #C [[ THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 AUTOSTART HEIGHT 600 WIDTH 600 ZOOM 5 PAUSE 2 LOOP 1500 ]]
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As of early 2019, the longest-lasting diehard found in an asymmetric soup (and fitting inside a 16x16 bounding box) is a 1058-tick "C1" pattern found by Dave Greene on January 20, 2019.

In other rules

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

External links