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|Number of cells||7|
|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.
For example, on January 7, 2019, a symmetric soup search run by Apple Bottom turned up a 31x31, 1340-tick diehard:
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In other rules
In HighLife, despite the instability of the traffic light sequence, the die hard still works, disappearing after 119 generations.
- Aidan F. Pierce. Re: Soup search results (discussion thread) at the ConwayLife.com forums