Engineered diehard

x = 32, y = 32, rule = B3/S23 3b3obob3o$7b2o3b3o$b3obo2bo3bo$3b3o2b2o4bo$12b2o$2bo5b4obo2bobo2b3o$bo b4o3b3o3bobob2o2bo$5bo5bobo3bo2b2obo$22bo$16bo8b3o$6b2o8b3o6b2ob2o$2b 2obo2bo7bo2bo6bobob2o$2b2ob2obo8b2o6b2o3b2o$6bob2o7b2o6b2obob2o$6bo2bo 3b2o12b3o$3b2ob2o5b2o10bo$3bo2bo10b2o5b2o$bobo2bobo7bobo2bo4bo$b2o4b2o 3bo3b2o3bo4b2o$11bobo8b5o$12bo12bo3$12b2o4bo2bo2bobo2bo$12bobo2bobo2bo bob3o$14bo3bo2b3o5b2o$ob2ob3o6b2o3b2obo3b2o$o2b2ob2o10bo2b2ob3ob3o$2b 5o12bo2bobo4b2o$3o3bo6b2ob2obob6ob4o$obo2b2o6b2ob4obo2b3o2b2o$2b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 600 ZOOM 14 ]] 30,273-tick diehard with bounding box 32 × 32 by Hickerson (click above to open LifeViewer) RLE: here Plaintext: here

Main article: Die hard#"Die hard" as a general term

Beginning in early 2022, there has been considerable interest in constructing artificial diehards within small bounding boxes. On March 1, Dean Hickerson shared a 9044-tick 32 × 32 diehard in a private email to Dave Greene. After a complex series of interactions between an active reaction and various still lifes, a single lightweight spaceship is produced which eventually catches up to and collides with 30P5H2V0, producing a single loaf. Finally, an even slower 25P3H1V0.1 eventually collides with the loaf, destroying both of them. On March 6, more optimized versions using different combinations of spaceships (including the especially slow copperhead) were shared, including a 14,010-tick diehard at 32 × 32 and an 18,477-tick diehard at 36 × 36.

Although Hickerson's results were not initially posted publicly, a forum thread was coincidentally started a few weeks later dedicated to diehards, including engineered ones. On March 31, Pavel Grankovskiy posted a 50,716-tick diehard in which a Simkin glider gun and pulse-dividing glider reflectors are used to slowly eat through a series of tubs. Although significantly larger than Hickerson's constructions at 90 × 86, Grankovskiy's 50,716-tick diehard does not use the "spaceship-chasing" technique, meaning that throughout its evolution, the pattern only slightly exceeds its initial bounds. Using spaceship-chasing, however, the pattern's lifespan can be increased by an order of magnitude to 518,476 ticks without further increasing the bounding box. Jiahao Yu optimized the bounding box of both of these patterns to 87 × 86, as shown below.

x = 87, y = 86, rule = B3/S23 64bo9b2o$63bobo7bobo$44b2o18b2o7bo$44bo27b2o2$53bo25b2o$51b3o24bo2bo$ 50bo28bobo$42b2o6b2o28bo2b3o$42bobo38bo$43bo40bo2$49bo$48b2o5b2o$56bo$ 51bo$50bobo$38b2o11bo$39bo8bo10bo$47bobo9bo$48bo4b2o4bo$45bo7bobo3bo$ 44bobo8bo$45bo9b2o$42bo$34bo6bobo$34b2o6bo7bo$39bo10b2o$38bobo13bo30bo $39bo13bobo29b2o$36bo17bo$35bobo19bo$25b2o9bo11b2o6bobo$26bo6bo15b2o6b o23bo$32bobo15bo9bo3b4o13b2o$15b4o14bo19b2o4bobo$30bo22bo6bo$29bobo19b obo18bo$10b2o8bo9bo20b2o10b2o7b2o$10bo7b3o6bo6bo28bobo14bobo3bo$17bo8b obo4bo30b2o14b2o3bo$2b2o13b2o8bo5b3o3bo40bo4b2o$3bo9bo9b2o13bobo27bo 11b2o3b2o$3bobo6bobo9bo14bo14bo6bo5bobo9bobo4bo$4b2o7bo40b2o5b2o5bo12b o4bo$9bo6bo25b2o6bo34b2o$9b2o4bobo23bobo6b2o5bo13bo13b2o$16bo21b2o2bo 14b2o11bobo4bo7bo$o18bo17b2o32bo5b2o7bo$2o16bobo18bo23bo10bo7b2o$2o4bo 12bo34bo8b2o8bobo6bobo$o4bobo14bo11bo19b2o18bo9bo$5b2o14bobo10b2o25bo 7b2o13b2o$22bo37bobo7bo$30bo6bo12b2o9bo5b3o6bo$14b2o9bo4b2o5b2o12bo6bo 8bo8b2o$14bo9bobo30bobo$25bo32bo$20bo24bo9bo13b4o$19b2o7b2o15b2o7bobo$ 28bobo24bo5b2o$29b2o9b2o10bo9bo14bo$39bobo6bo2bobo23b3o$39b2o6b2o3bo 27bo$25b2o9bo42b2o$26bo8bobo$22bo3bobo7bo16b2o$22bo4b2o4bo20bo19bo$22b o9bobo38bobo$22bo10bo8b2o28bo2bo$30bo12bo4b2o23b2o$29bobo17b2o$30bo19b o20b2o$25b2o43bobo$26bo5bo39bo$32b2o$49bo$38bo10b2o$37bobo10b2o$30b2o 6b2o$31bo$28b3o13bo$28bo14bobo$43b2o$36b2o$37bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 640 WIDTH 640 ZOOM 6 ]]

50,716-tick diehard with bounding box 87 × 86 by Grankovskiy and Yu (click above to open LifeViewer) RLE: here Plaintext: here

x = 87, y = 86, rule = B3/S23 7b2o6b2o47bo9b2o$7bobo5bobo45bobo7bobo$8bobo5bo27b2o18b2o7bo$9bo34bo 27b2o$13b3o8b2o$15bo8bo5bo22bo25b2o$14bo10b3o2b2o19b3o24bo2bo$27bo22bo 28bobo$30b2o10b2o6b2o28bo2b3o$25b6obo9bobo38bo$15b2o7bo2bo4bo10bo40bo$ 14bo2bo6b2o3b3o$5b2o8bo2bo9b2o19bo$5bo10b2o30b2o5b2o$20b2o4bo29bo$19bo bo3bobo23bo$19b2o5bo23bobo$9b2o27b2o11bo$9bo29bo8bo10bo$47bobo9bo$48bo 4b2o4bo$45bo7bobo3bo$2o42bobo8bo$o44bo9b2o$42bo$34bo6bobo$34b2o6bo7bo$ 39bo10b2o$38bobo13bo30bo$39bo13bobo29b2o$36bo17bo$35bobo19bo$25b2o9bo 11b2o6bobo$26bo6bo15b2o6bo23bo$32bobo15bo9bo3b4o13b2o$15b4o14bo19b2o4b obo$30bo22bo6bo$29bobo19bobo18bo$10b2o8bo9bo20b2o10b2o7b2o$10bo7b3o6bo 6bo28bobo14bobo3bo$17bo8bobo4bo30b2o14b2o3bo$2b2o13b2o8bo5b3o3bo40bo4b 2o$3bo9bo9b2o13bobo27bo11b2o3b2o$3bobo6bobo9bo14bo14bo6bo5bobo9bobo4bo $4b2o7bo40b2o5b2o5bo12bo4bo$9bo6bo25b2o6bo34b2o$9b2o4bobo23bobo6b2o5bo 13bo13b2o$16bo21b2o2bo14b2o11bobo4bo7bo$o18bo17b2o32bo5b2o7bo$2o16bobo 18bo23bo10bo7b2o$2o4bo12bo34bo8b2o8bobo6bobo$o4bobo14bo11bo19b2o18bo9b o$5b2o14bobo10b2o25bo7b2o13b2o$22bo37bobo7bo$30bo6bo12b2o9bo5b3o6bo$4b o9b2o9bo4b2o5b2o12bo6bo8bo8b2o$4b2o8bo9bobo30bobo$25bo32bo$20bo24bo9bo 13b4o$b2o4b2o10b2o7b2o15b2o7bobo$b3o2b3o19bobo24bo5b2o$4b2o23b2o9b2o 10bo9bo14bo$2bo4bo31bobo6bo2bobo23b3o$bo6bo30b2o6b2o3bo27bo$4b2o19b2o 9bo42b2o$2b2o2b2o18bo8bobo$4b2o16bo3bobo7bo16b2o$22bo4b2o4bo20bo19bo$ 22bo9bobo38bobo$22bo10bo8b2o28bo2bo$30bo12bo4b2o23b2o$29bobo17b2o$30bo 19bo20b2o$25b2o43bobo$26bo5bo33bo5bo7bo$32b2o31bobo11bobo$49bo15b2o12b 2o$38bo10b2o$37bobo10b2o20b2o$30b2o6b2o31bobo$31bo40bo$7bo20b3o13bo$6b o3bo3bo5bo7bo14bobo$7b3o3bo2bobo2bo21b2o21b2o$8bob2o4b2ob2o15b2o28bobo $12b3ob2obo17bo29b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 640 WIDTH 640 ZOOM 6 ]]

518,476-tick diehard with bounding box 87 × 86 by Grankovskiy and Yu (click above to open LifeViewer) RLE: here Plaintext: here

Sawtooth-based designs

Using a sawtooth allows for the creation of extremely long-lasting diehards. On April 7, 2022, Pavel Grankovskiy successfully constructed a diehard using a sawtooth an expansion factor of 121. The pattern fits within a bounding box of 99 × 101 (just barely meeting the 10,000-cell restriction specified in the original post) and lasts approximately 2.280624 × 10⁸⁷⁰ generations. Further optimizations, with the help of toroidalet, Dean Hickerson, EvinZL, Rocknlol, and Adam P. Goucher increased its lifespan to ~1.33616 × 10¹⁴⁴³ ticks and decreased its bounding box to 94 × 98.

x = 94, y = 98, rule = B3/S23 15b2o12b3o2b4ob3o3bo3b2o$14bo2bo11bob2o2bo8b2ob3o$14bo3bo7bo3bo2b2o8b 3o21b2obo3b8ob3o$15bo3bo7b2obo6bo6b2o4bo13bob2o2b3o5b3o2bob2o$16b4o5b 2obo5b2obo6bobobobo14bo3b2o3bo8b2o$16bo9bo3b2o9b2ob4o17bobob2o4bo8bo$ 16b2o8bo4bob2obo5bob3o17bo6bobo13bo3b2o$18bo6bo3bo10bo3bo13b2o3bobo2bo 3bo14b2o4bo$15bobo22b5o12bo2bo5bo5bo7bobo5bo2bo$16bo14b2o25b2o11bo9b2o 5bo3bo$31b2o5b4o2bo17b2o4bo12bo7bo3bo$28bo9bo2bo19bobo3bobo20bo2bo$22b o4bobo32bo5b2o16b2o3b3o$21bobo4bobo14b2o34b2o3bobobob2o$11b2o8bobo5bob o8b2obo2bo34bo7bo3bo$12bo9bo7bobo7b2ob2o21b2o14b3o2b2o4bo$12bobo16bobo 32bobo15bo5b2obo$13b2o3bo13bobo32bo19b3o3bo$2b2o3b2o8bobo13bobo6b2o14b 2o33bo$2b3ob3o9bo15bobo5b2o13bo2bo15b2o11bo3bo$3b2ob2o7bo5bo7b2o4bobo 20bobo14bo2bo11bob2o$14bobo3bobo7bo5bobo20bo15bobo10bobo$o2b3o2bo6bo5b o5b3o7bobo36bo12bo$2bo4b2o3bo5bo8bo10bobo5bo16bo20b2o$ob2ob3o3bobo3bob o19bobo3bobo13b3o19bobo$ob2ob4o3bo5bo21bo5bo13bo14b2o7bo$obo3b2obo5bo 27bo16b2o12bo2bo$4bo3bobo3bobo5b2o18bobo29bobo$2ob4o2bo5bo6b2o13bo5bo 31bo$bo10bo23bobo$2o4bo4bobo22b2o13bo2bo29b2o$3obobobo3bo12b2o23bo3bo 9b2o5b2o11b2o$bo3b2o2bo15b2o14b2o7bo4bo8b2o5b2o$bo2b5obo30b2o7bo4bo$3o 2b2o2bo12b2o27bo3bo11b2o$2o2bo3bo13b2o28bobo12b2o17b2o$ob4o8b2o70bobo$ 4o2bobo6bo23bo47bo$2o3bo9bobo21bo$b2o13b2o21bo4b2o43b2o$o2bobo2bo35b2o 43bobo$2bo3bo79bo3b2o$12b3o25b2o5b2o21b2o13bobo$2bo5bo31b2o5b2o21b2o 14bo$2bo5b3o72bo5bo$2bo8bo70bobo3bobo$10b2o71bo5bo$65bo20bo$52b2o6bo3b obo4b2o12bobo$2bo49b2o5bobo3bo4bo2bo12bo$o48bo10bo10b2o$obo3b2o10b3o 12b2o13bobo$o5b2o8b2ob2o8b3obobo13bo31b2o4b2o2b2o$o15b2ob2o11bo2bo19bo 25bo5bobo2bo$3b2o12b2o9bo24b3o6b2o9bo9bo5bobo$3b2o47bo10bo8bobo7b2o5b 2o$52b2o9bobo5bobo6bo3b2o$41b2o21b2o4bobo7b4o2bo$33b2o6b2o17b2o7bobo3b 2o6bob2o$26b2o5b2o24bo2bo5bobo4b2o3b2obobo$26b2o10bo20bo2bo4bobo10b2ob obo$37bobo20b2o4bobo14bob2o$23b2o5b2o6bo26bobo15bo$23b2o5b2o32bobo14bo bo$34b2o29bo15b2o$3bo29bobo26bo11b2o9b2o$33b2o13b5o8bobo11bo9bo$2ob3o 41bob3obo8bo7b2o3bob2o4bobo$2o2bo2bo40bo3bo17b2o2b2obo2bo2b2o$o6bo21b 2o13b2o3b3o5b2o7b2o9bob2o$2o2bo2bobo11bobo4bobo13b2o4bo6b2o7b2o2b2o5bo 5b4o$2bo4bo14b2o4b2o31b2o7bo5b2o4bo3bo$3bo2bobo13bo32bo5bo10bo8bobo$5b o41b2o5bobo5bo8b2o9b2o$2bob3o3bo37bo6bo5b2o$4bo5bo28bo5b3o4bo5bo$3bo3b o2b2o9b2o15bobo4bo5bobo3bobo5b2o$12bo7bobo16bo12bo5bo6b2o$12b3o5b2o27b o5bo$39bo8bobo3bobo$38bobo8bo5bo3b2o$15bo22bo2bo3bo6bo6bobo$14bob5o18b 2o3bobo4bobo7bo$13b2o5bo23b2o6bo8b2o12b2o$13b2o3bo2bo52bobo$21bo53bo$ 15b2obo2bo26bo$18bo2bo25b2o2bo$19b2o7bo20bo3bo2b2o$19b2o6bobo15b2o4bo 4b2o$27b2o20b2o20bo$46b2o5bo17bo$44bo4bo3bo9bo7bo$17b2o7b2obo18b2ob2ob o7bobo$18bo4b2o2b4o16b2ob2o2bo6bo2bo$17bobo2bo8bobo13bo6b2o6b2o$17bo2b 2obo2bo3bo2bo8bo2b2o5b2o$18b3obo2b3ob7o5b9ob5o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 670 WIDTH 700 ZOOM 6 ]]

94 × 98 exponential diehard by Grankovskiy et al. (click above to open LifeViewer) RLE: here Plaintext: here

On April 9, Grankovskiy posted a concept for a pattern whose lifespan is measured via tetration, the next hyperoperator after exponentiation. Originally posted in the form of a methuselah, the diehard version was completed on April 11. With optimization by Tanner Jacobi and toroidalet, its lifespan is somewhere between ¹⁵10 and ¹⁶10 ticks.

x = 111, y = 90, rule = B3/S23 21b6o23b8obo$19b10o21b2obobo4b3o24b2o15bo$21bo4bo26bo3b2o28b2o8bo6bo$ 43b2o13b2o2bo34b2o5bo$44bo12bo40bo8b2o$44bobo6b2o3bobobo21b2o21bobo$ 45b2o6bobo28b2o22bo$56bo7b2o$39b3o11bo2bo7b2o21b2o8bo$30b2o6b3o15bo30b 2o6b3o4b2o$30b2o13bo7bobo38bo7b2o$44bobo6b2o39b2o$45bo$23b2o17bo5bo50b 2o7b3o$23b2o6bo9bobo3bobo18bo30b2o6bobo$31b2o7bobo5bo3b2o13bobo37bo$ 31b2o6bobo3bo6b2o14b2o32bo2bobob2o$32bo5bobo3bobo9bo5b2o22bobo13b2o3b 2obo$37bobo5bo9bobo3bo2bo23bo17bobobo$36bobo17bobo3b2o20bobo21b2o$35bo bo19bobo24bo23bo$34bobo21bo24bobo$33bobo6b2o5b2o4bo27b2o$21b2o3b2o4bob o7b2o5bo4bobo3b2o20bo$22b5o6bo13bobo5bo4bobo20b2o$22b2ob2o20b2o12b2o 13b2o6bo$22b2ob2o10b2o37b2o$23b3o4b2o5b2o$30b2o23b2o22b2o$55bo23b2o$ 42bo10bobo13b2o$41bobo9b2o14bobo13b2o$21b2o4b2o5b2o4bob2o26b2o4b2o6bob o4b3o$22bo4bobo4b2o3b2ob2o22bo9b2o6b2o5b3o$19b3o6b2o10bob2o21bobo13bo 8bo3bo$19bo21bobo22bo6bo6bobo8b5o10bobo$31bo10bo29bobo4bobo10b4o11b4o$ 30bobo39bobo3bobo24bob2o$25b2o4bobo39bo5bo6bo18bo4bo$27bo4bobo25b2o8bo 5bo7b3o18b3ob2o$24bo8bo25bobo7bobo3bobo5bo7b2o13b3obo$25b2o31bo2bobo6b o5bo6b2o6b2o12bo3b2o$43bo14b2o2b2o3bo5bo33bobo$20bo16b2o3bobo10bo10bob o3bobo12bo17bo2bobo$20b3o8bo5b2o4bo10bobo10bo5bo7bo5bo18bobo$23bo7b2o 22bo8bo5bo9b3o4bo$13bo8b2o7b2o9bo20bobo3bobo7bo3bo8bo$12bo6bo12bo9bobo 19bo5bo7bob3obo7bo$12b3o3bobo6bo14b2o17bo5bo11b5o8bo$17bo2bo6b2o31bobo 3bobo$17bobo7b2o32bo5bo$18bo3bo5bo35bo$21bobo39bobo$21bo2bo39bo$22bobo 47bo25bo$12bo10bo22bo25b3o23b2o$12bobo4bo25bobo27bo23b2o$5bo6b2o5b2o 24b2o5bo21b2o15b2o$4bo14b2o30bobo29b2o6b2o$4b3o13bo31bo3b2o25bo$15bo9b o29bobo26b3o$15b2o7bo2bo14bo12b2o29bo7b2o$15b2o4b2obo2bo14b2o7bo42b2o 9bo2bobo$16bo5bo5bo13b2o6bobo53bobobo$11bo11b5o15bo7b2o38b2o14bo$11b2o 11bobobo62b2o17bo$11b2o11b5o79bo$o11bo12bo7bo72b2o2bo$obo4bo18b4o75b3o b2o$2o5b2o18bo3b2o19bo7b2o5bo37b2o3bo$7b2o4bobo17bo17bobo5bobo4bobo36b obob2o$8bo4b2o19bo2bo14bo6bo6b2o38bo$o13bo20bo13bo8b2o45b3o2bo$b3obo 29bo12bobo54b2obobo$bo2b2o43bo5bo$4bo31bo17bo2bo15bo$ob2obo30bob2obo4b 2o6bo2bo5b2o3bo4b2o$2o33b2obobob2o2b2o8bo6b2o2b2o5b2o$o35bob3o27b2o4bo 26b3o4bo$bobo33b2obo3bo6b2o16bo3bo26bo2bo4b2o$38b3ob2o6bo2bo46bo2bo2bo bobo$40bo10bo2bo52b2obo$41b2o4bo4b2o51bobob2o$9b4o29bo3bo2bo6b2o7bo2b 2o23bo13bo$9bo3bo2b2o2b2o3bo20bo2bo5bo2bo4b3o2b2o2bo16bob5o3b2o5b2obo$ 9bo6b3o4bo10b2obobo2bo5bo5bo2bo8b2o2b3o18b2ob2o4bo4bob2obo$10bo4b4obo 2bo11bobo3bo13b2o9b2o2b3o19b2o2b2o11bo$15b2obobobobo10bo4b2o3b2o19b2o 6bo2bo9b2o2b2obo14bo$16b10o10b3o2b2obo22bo6b3o10bo3b2ob6o2bo$35b9o2bo 41bo2bo3b5o2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 670 WIDTH 760 ZOOM 6 ]]

111 × 90 tetrational diehard by Grankovskiy et al. (click above to open LifeViewer) RLE: here Plaintext: here

On July 9, 2023, EvinZL proposed adding loaf-making fuse to increase the lifespan of the methuselah by extending power tower length, based on the original idea of Tanner Jacobi. In a flurry of activity that followed after, toroidalet, Adam P. Goucher, Pavel Grankovskiy and EvinZL pushed the number of loaves from 15 to approximately 3.52 × 10⁴⁸, with the latter improvement based on idea by Adam P. Goucher to use gliders from exponential part of diehard to ignite the fuse. This was subsequently improved to 1.1 × 10¹⁰⁴⁶.

x = 109, y = 91, rule = B3/S23 18b8o20b12o4b5o2bo15b2o15bo$19bo4bo22bo3b2o8b2obob4obo13b2o8b2o5bo$41b 2o4bo4b2o9b4o27bo2bo4bo$42bo4b2o46b2o8b2o$42bobo8bo3bo24b2o21bobo$43b 2o3bob2obo2bo25b2o22bo$48b2o6b3o3b2o$37b3o8b2o12b2o21b2o8bo$28b2o6b3o 46b2o6b3o4b2o$28b2o13bo9b3o36bo7b2o$42bobo8bo38b2o$43bo8b3o$21b2o17bo 5bo4b2o7b2o35b2o7b3o$21b2o6bo9bobo3bobo4b2o6b2o4bo30b2o6bobo$29b2o7bob o5bo2bobo13bobo37bo$29b2o6bobo3bo22b2o35bobob2o$30bo5bobo3bobo6bo2bo5b 2o20bo2bo19b2obo$35bobo5bo6bo2bobo3bo2bo21b4o9bo6bobobo$34bobo13bo3bob o3b2o19bo13b2o9b2o$33bobo19bobo24b2o2b2o8b2o8bo$32bobo21bo45b2o$19b2o 3b2o5bobo6b2o5b2o4bo28b2o17bobo$19b2o3b2o4bobo7b2o5bo4bobo3b2o21b2o18b o$20b5o6bo13bobo5bo4bobo21b2o4b2o10b2o$21bobo21b2o12b2o13b2o14bo$35b2o 37b2o11bo$21b3o4b2o5b2o51b2o$27bobo23b2o22b2o14bo8b3o$27b2o24bo23b2o 13bo2bo$42bo8bobo13b2o23bo2bo$40bobo8b2o14bobo13b2o9bo$19b2o11b2o4b2o 28b2o4b2o6bobo$20bo5bo5b2o4b2o24bo9b2o6b2o5b2o$17b3o5bobo10b2o23bobo 13bo9b2o$17bo8bobo11bobo11b2o8bo6bo6bobo23bobo$27bobo12bo10bobo14bobo 4bobo12b2o11b4o$28bobo22bo16bobo3bobo13b2o9bob2o$23b2o4bobo5bo14b2o17b o5bo6bo18bo4bo$25bo4bo5bobo6b2o11b2o8bo5bo7b3o18b3ob2o$22bo14bo6bobo 10bobo7bobo3bobo5bo7b2o13b3obo$23b2o19b2o3b2o5bo2bobo6bo5bo6b2o6b2o12b o3b2o$30bo10bo6bobo5b2o2b2o3bo5bo33bobo$29bobo8bobo5b2o3bo10bobo3bobo 12bo17bo2bobo$30bo10bo10bobo10bo5bo13bo18bobo$16bo28b2o6bo8bo5bo9b3o4b o$16b3o26b2o14bobo3bobo8b3o9bo$19bo21bo20bo5bo8bo3bo8bo$18b2o20bobo16b o5bo24bo$b2o8b2o9b2o17b2o15bobo3bobo9b2o3b2o$5o6b2o8bo2bo8b2o24bo5bo$ 2ob2o16bobo3b2o3bobo21bo5bo$5b3o14bo3bobo3bo22bobo3bobo7bo$2o2bo3bo17b 2o3b2o17bo5bo5bo7bobo$2bo2bo5bo3b2ob2o16bo13b3o6bo11b2o23b2o$9b4o2bo3b o15bobo6bo8bo4bobo34bo2bo$b4o3bob3o3b3o17bo6bobo6b2o5bo36bobo$bo5bo4b 2o29b2o11bo32b2o6bo$4b3ob2o21bo5bo9b2o6bobo23b2o6b2o$2o3bo2bo2bo4b3o3b 2o6bobo3bobo8b2o7bo19bo4bo$ob3o3b2ob2o2bo3bobobo5bobo5bo37bobo4b3o$2o 2b2ob2o2b2o2b2ob2ob2o5bobo45bo7bo7b2o$o2b3o5bo17bo16bo45b2o9bo2bobo$2o 3bo2b2o3bo12bo5bo5bo6bobo56bobobo$o5b4o15bobo3bobo4b2o6bo9b2o4bo16b2o 8b2o14bo$2obo5bobo14bo5bo5b2o3b3o9bobo3bo2bo14bobo7b2o17bo$o3bob2o3bo 17bo9bo3bo11b2o4bo2bo3b2o11bo24bo$bo7b2o17bobo16b2obo12bo4bo12bobo20b 2o2bo$b3ob2o8bo13bo3b2o13b3o2b3obo2bo8b3o10b2o19b3ob2o$3bo4bo5bo2bo4b 2o9bo19bo2b2o2bo4bo6bo30b2o3bo$b2o2bo3bob2obo2bo4bobo9b3o6b2o4bob2obob o2b3o2bobo4b2o31b2ob2o$obo2b3o4bo5bo4bobo10bo5bo3b2ob3o3b2o3b2o2b2o13b 2o23bo$2ob3obo5b5o6b2o7bobo9b3obo10bo18b2o22b3o2bo$2ob2o2bobo4bobobo 14b2o4bo3b2ob3o2bo2b2obo2bobo40b2obobo$14b5o12b2o5bobo5b2o5bo5b2obo$ 15bo7bo5bo2bo6bo6bob2ob2o2b2o4bo5bo$16b4o9b2o5bo10bob2o6b2o2bo4bobob2o $17bo3b2o12bobo11bo2bo2bo3bob2o2bob3ob2o24bobobobo2bo$23bo12bo9b2o3b3o 5b2o5b6o27bob2o2b2o$24bo2bo5bo12b2ob5obob3o10bo31b2o2bobo$25bo6bobo12b 3o10bobo34bo2bobo5bo$25bo7bo12bo4bo2bo2b2o3bo35b3o2b3o2bo$40bo2bo2bobo bobobo2b2ob2o38b3o4bo$26bo9b2o6bo4bobobo3b2ob3o36b4o4b2o$26bob2obo4b2o 2b3o4bob2obo3bo4bo6bo19b2o7b5o3bob2o$25b2obobob2o8bo2bobobo5bo5bo5b2ob o17b2o8bobobo5bo$26bob3o10b3obo4b3ob2o3bobo5bo34b2o$27b2obo3bo5b2o5bo 3b3obobo2bob2o3b3o3b2o10b2o5b2o7bobob3o$28b3ob2o6b2o2b2o2bo2bobo3bo4b 2o5bob5o9b2o5b2o6bob7o$30bo11b2obo7bo3bobo3b2o6bo3bo24b2ob2obo$31b2o7b 2obob2obobobobob2o2bob3o7b3o20b2o$32bo7b3o4b8o5bob2o8b3o20b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 670 WIDTH 760 ZOOM 6 ]]

109 × 91 tetrational diehard with a lifespan exceeding (101046)10. (click above to open LifeViewer) RLE: here Plaintext: here

On December 23, 2024, Tim Coe posted a 49 × 49 sawtooth-based diehard with lifetime 1237975907532, reducing the size of the sawtooth base.

Double-tetrational designs

On 15th September 2023, Tim Coe and b3s23love increased the height of the tetrational tower from 1.1 × 10¹⁰⁴⁶ to 121^{8.46 × 101059}. The following day, Tim Coe further improved this height to 121^121121121498, so the height of the tetrational tower is itself a tetrational tower. This was subsequently further improved by Tim Coe, toroidalet, EvinZL, and b3s23love, culminating in a height of 121^{1211211211211211211211211356648129958673823266622201465466300} as of the 28th September 2023. The overall lifespan of the diehard exceeds ¹¹¹¹11, or 11^^^3 in Knuth's up-arrow notation. More recent designs have further improved lifespans, with the current record holder taking 17^^^3 generations to die out entirely.

x = 116, y = 86, rule = B3/S23 bob2o2b3o6bob5o3b4o6b2o7b2o6bob4o7bo9bob3o2bo4bo7bob6o2b2o4b2o$o4b2o4b o3bo2bobobo3bob4obo2bo2b2obobo2bobo2bobo2b4o7bo5bob3o2b2o2b2obo11bobo 4b2o2bobo$2obo2b2o2b2o2bob2o2bob2o4bo4bo3b2o2b2ob2o2b2o2bo5bobo3bo3bo 5bob2o4b2ob3o5b2o2b3o8bo3bo$bo5b2o5bo2b2obo3bobo12bo14b2o8bobo14bo2bo 2bobo2b2o3bobobo$2ob3obo2b2o5bo6bo2b2o2bo4bobo14b2obo2bo4bo12b4o2bo3bo 6bo2b3o2b2o6bo2bobo$2b3obo3bo3b2ob3obo2b2obo2b3o3b2o3b2o8b2o3b2ob2o3bo 16b2obo3bo11bo7b3o2bobo$4bob3ob2o3b3ob3o5b3obo9bobo7b2o3bo2bo4bobobo 10bobob2o11bobo5bo2bo7bo$2b2o2b2o2bo3b2obobo3bobob2o3b2o8b2o7bo5bobo8b o27bobobobo4b2o6bo$9b2o39b2o6bo16b2o3b5o$37b2o11b2o3bo5bo10b2o2bo3bo3b o4b2o21b2o$bobobo19b2o10b2o5bo9bobo3bobo2b2o4bobobo7bo4bob3o19b2o$o3bo 2bo17bo2bo15b2o9bo5bo3bobo3bo3b2o6b2o2bo5bo$bo2bo22b2o15b2o6bo5bo7b2o 4b3o2bo10b3obo$bo2bo32bo7bo5bobo3bobo14bobo13b2o$2o3b2o2b2o2bo22b3o13b o5bo5bo4b2o4bob3o$3ob2o7bo7bo13bo3bo9bo5bo7bobo3bobo5bo2bo$2o4bo3b2ob 2o5bobo14bo10bobo3bobo7bo5b2o5bobo13b2o$2ob2obo5bobo5b2o12bo5bo8bo5bo 3b2o17bo13bo2bo12bo2bobobo$2o4bo2bo2bo21bo5bo11bo6bobo6bo4b2o15b3obo9b 2o2b5obo$o3bo2bo4bo22bo3bo5b2o4bobo7bo5bobo3bobo13bo4b2o8b2o$3bo6b3o 23b3o6b2o5bo8b2o5bo5b2o13bob2o2bo14bo3b2o$3o2bo3bob2o36bo36b2obobob2o 9b2o3bobo$o4b2o41bobo4b2o29bobo15bo2bo2bob2o$o4b2o24bo11b2o4bo5b2o30bo 17bob4o3bo$2ob3o24b2o10bobo23b2o22b2o10b2o9bo$o3b4o12b2o8b2o10b2o24bo 23b2o10bo2b4obo2bo$o19bobo7bo27b2o6bobo13b2o21b2obo4b3o$21bo34bo2bo6b 2o14bobo13b2o11b3o$12b2o20b2o5bo5b2o6bo27b2o4b2o6bobo13bo$12bobo20bo4b obo4b2o6bo6bo16bo9b2o6b2o5b2o3b3obobo$14bo17b3o6bo13bo7b2o6bo6bobo13bo 9b2o8bo$14b2o2b2o12bo5bo5bo11bo2bo10bobo6bo6bo6bobo14bo$bo16bo2bo15bob o3bobo12b2o11bo13bobo4bobo12bob4ob2o$2b2o16b2o6b2o2bo5bo5bobo27bo10bob o3bobo13b2ob2o3bo$2bo24bob4o8bo3bo6bo20bobo10bo5bo6bo15bo$26bo13bobo8b obo10b2o8bo8bo5bo7b3o$2bo3b2o12bo6b4o10bo10bo3bo8bo5bo10bobo3bobo5bo7b 2o3bob2o$obo2bobo5b2o3b3o7bo2bo15b2o6bobo4b3o5bobo10bo5bo6b2o6b2o3b2ob 3o$2bo2bo7b2o2bo8bo3bobo2b2o10b2o6bobo4bo8bobo6bo5bo28bo$2b2ob2o10b2o 7b2o3bo3b2o19bo11bo3bobo4bobo3bobo26bo$5bo2bo36bo21bobo3bo6bo5bo13b2o 11bo$5bob2o29b2o4bobo5b2o4b2o8bo8bo5bo16b2o11b2o$b2ob2obo23b2o5bobo4b 2o4bobo3bo2bobo13bobo3bobo20b2o$b2obo2bo23b2o7bo10b2o3bobo2b2o14bo5bo 9b3o9bo$5b2o32bob2o14bo16bo5bo11bo3bo5b2obo4b2o$34b2o4bo2bo4b2o23bobo 3bobo19bobob2o3bo$27b2o5bobo4b2o4bobo24bo5bo10bo5bo2bo2bo2bo4bo2b2o$ 27b2o7bo10b2o5b2o15bo5bo13b2o3b2o3b2ob2o6bo2bo$35bob2o16bo4b2o8bobo3bo bo5bo17bobo4bo3b2o$15b2o13b2o4bo2bo5bo6b3o3b3obo8bo5bo5bobo16bobo3bobo $17bo5b2o5bobo4b2o5bobo5bo4bo5bo4bo5bo9bo18bo5bobo$14bo8b2o7bo12bo11bo 2b3o4bobo3bobo5bo5bo12b3o7b2o2b2o$15b2o14bob2o7bo5b2o4b2obobo8bo5bo5bo bo3bobo11bo14bo$26b2o4bo2bo5bobo3bo2bo3bo2bob2o4bo5bo9bo5bo16b2o2b3o2b 2o$bo17b2o5bobo4b2o7bo5b2o5b2o7bobo3bobo11bo5bo5b2o6b2o7b3o$2bo16b2o7b o10bo5bo19bo5bo5b2o4bobo3bobo4bo11b2obobo$obobo22bob2o7bobo3bobo21bo7b obo5bo5bo6b3o13b3o$o3bo17b2o4bo2bo7bo5bo12bo8bobo6bobob2o5bo5bo5bo8b3o 4bo$o3bo7b2o3bo4bobo4b2o4b2o5bo14bobo8bo8b2obo5bobo3bobo12b2o3b2obo$2b 4o7bo2bobo5bo9bo2bo3bobo14bo5bo7b2o7bo5bo5bo13b4o$2o2b2o10bobo4bob2o7b obobo3bo3b2o4bo2bo7bobo6bo2b5obo8bo5bo7b2ob2o2b3o$15b2ob2o4bo2bo7bo2bo 7bo5b4o8bo8b2obo2bob2o6bobo3bobo6b2o2b2o5bo$13bo2bo3bo4b2o11b2o7b3o11b o5bo22bo5bo10bob2o$2bobobo2bo2bo3bo3bo21bo6bo2b2o6bobo3bobo24bo15bobob obo$3b2o4bobo5b2obob2o5b4o8bobo9bo7bo5bo11bo12bobo16b2o2bo$4o2bob2o2bo bo4bobobo3b2o4b2o7bo8bo6bo5bo13bobo12bo20b2o$7b2o3b3o4bobo5b2o5bo4bo7b 2o2b2o4bobo3bobo12bobo15bo8b2ob2obo2b2o$2obo2bo2b2o2bob2o3b2o7b2obobo 3bobo4b3obobo6bo5bo9b2o3bo15bobo7b2obob2o$b2obo4b2o3b2o18bo4bo4bo4bobo 3bo5bo12bo21bo13bo4bo$b2obob2o2bo2bo2bo13bo3bo8bob4obo3bobo3bobo9bobo 30b2obobobobo$o12bo2bobo11bo4bo7bo4bo6bo5bo9bobo27b2o2bo2bo4b3o$2o2bob 3obo2bo18b3o3bo3b2ob2obo9bo12b2o28b2o4bobo5bo$o2bob2o4bo2bo3bo13b2o4bo 5bo2bo9bobo9b2o5bo31bobo$3o2bo5b2ob2ob3o18b2o4bobo3b2o6bo9bobo3b4o11bo 11b2o3bobo2bo$o4b3o2b2o28bo4bo4bo2bo11bo3bo6bo8b2o2b3o9b2o3b2o2b2o$2o 4bobo3b2o26b3o8b3o8b4o9b2o3b2o2bobo5bo$b2obo2b2o3b2o32bo7b2o8bo3bo2bob 3o4b2o2b2o5bo$2o2bo2bo2bo2bobo28bo8bo2bo2bo4b3o2bobo5bo12bo$3o4bo4b2ob o24bo4b4o4bobo5bo2b3obob3o2bo14b2o$2o9b3o28bobo9bo4bob2obobo5bobobo2b 2obo2b2o$bo3b3o5bo28b2o5bo10bo2bo2b2o3bo3b2ob4o21b2o5bobo$4bo36b2o3bob 2o9b2o2b3o2bo4bo3b2ob2o2bo5bo2bo9b2o4bo2bob2o$40bo3bo4bobo8b3obo4b3o2b 2o5b2o3b5obo14bo2bo$42bo2bo13bo3bo2b2o4bob2o7b2o2bo5bo6b2o5bob3o3bo$ 46bob2o14bob2obob3o2bo3bo5bo2b2o9b2o6bob3ob2o$46b4o10b3o3bob4o3bo3bobo 5b3obo2bo13bob2obobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 670 WIDTH 760 ZOOM 6 ]]

116 × 86 tetrational diehard with a lifespan exceeding 17↑↑↑3. (click above to open LifeViewer) RLE: here Plaintext: here

Timetable

In many cases, several incremental record-breaking improvements were made within 24 hours. In the following table, the record-breaking pattern for each day is listed (with each day beginning and ending at UTC 0:00).

Date	Lifespan	Bounding box size	Bounding box cells	Contributor(s)
2022-02-21	2474	32×32	1024	Charity Engine
2022-03-01	9044	32×32	1024	Dean Hickerson
2022-03-06	14010	32×32	1024	Dean Hickerson
2022-03-31	518476	90×86	7740	Pavel Grankovskiy
2022-04-01	518476	87×86	7482	Jiahao Yu
2022-04-07	2.28 × 10^870	99×101	9999	Pavel Grankovskiy
2022-04-09	1.77 × 10^1295	94x96	9024	Pavel Grankovskiy, toroidalet, Rocknlol
2022-04-10	1.476 × 10^1595	94×99	9306	Pavel Grankovskiy, Dean Hickerson
2022-04-11	11 ^^ 10	105×95	9975	Pavel Grankovskiy
2022-04-13	11 ^^ 11	108×92	9936	toroidalet, Pavel Grankovskiy
2022-04-14	11 ^^ 13	109×91	9919	Pavel Grankovskiy, toroidalet, Tanner Jacobi
2023-07-17	121 ^^ 15	110×90	9900	toroidalet, Pavgran
2023-07-18	121 ^^ (4.98 × 10^27)	111×90	9990	Pavel Grankovskiy, toroidalet, EvinZL, Adam P. Goucher
2023-07-19	121 ^^ (5.94 × 10^54)	109×91	9919	Pavel Grankovskiy, May13, toroidalet, EvinZL, Adam P. Goucher
2023-07-20	121 ^^ (1.67 × 10^903)	109×91	9919	May13, EvinZL
2023-07-23	121 ^^ (1.10 × 10^1046)	109×91	9919	Adam P. Goucher
2023-09-15	121 ^^ (121 ^ (8.46 × 10^1059))	108×91	9828	Tim Coe, b3s23love
2023-09-16	121 ^^ (121 ^ 121 ^ 121 ^ 121 ^ 498)	109×91	9919	Tim Coe
2023-09-19	121 ^^ (121 ^ 121 ^ 121 ^ 121 ^ 121 ^ (9.74 × 10^51))	109×91	9919	b3s23love, toroidalet, EvinZL
2023-09-21	121 ^^ (121 ^ 121 ^ 121 ^ 121 ^ 121 ^ 121 ^ 121 ^ 60143)	109×91	9919	EvinZL, Tim Coe
2023-09-22	121 ^^ (121 ^ 121 ^ 121 ^ 121 ^ 121 ^ 121 ^ 121 ^ 70433)	112×89	9968	b3s23love, toroidalet, EvinZL
2023-09-24	9 ^^^ 3	112×89	9968	Tim Coe
2023-09-28	11 ^^^ 3	112×89	9968	toroidalet
2023-10-05	17 ^^^ 3	116×86	9976	Tim Coe, EvinZL, Adam P. Goucher
2023-10-05	17 ^^^ 3 +	116×86	9976	toroidalet

External links

• Pavel Grankovskiy (April 12, 2022). Re: (Engineered) diehards (discussion thread) at the ConwayLife.com forums (analysis of the tetrational diehard's total runtime)