Thread for small diehards

[hth3]

20 cells 9x9 71 gen, probably semi-significant

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x = 9, y = 9, rule = B3/S23
2bo2bo$3b3o3$2o5b2o$o7bo$b3ob3o$3bobo$4bo!

22 cells 9x8 68 gen:

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x = 9, y = 8, rule = B3/S23
2b2ob2o$3bobo$4bo$2o5b2o$o7bo$b3ob3o$3bobo$4bo!

[Pyry Virtanen]

I decided to post an updated list of the longest-lasting known diehards with low cell counts, namely 1 - 17 and 20. There hasn't been much progress on this subject lately, and the older list in the first post of this thread is outdated. Again, there is a restriction that each pattern on the list must fit into a 2N x 2N bounding box, where N is its population.

Most of the entries are the same as in the earlier list, except the ones for 8, 12, 14, 17 and 20 cells. Note, that I have changed the orientation of some of the patterns and made some minor modifications that don't affect the patterns' lifespans or cell counts. All of the patterns in this post are already known, but they were scattered across multiple different posts. That's why I'm posting this list.

1 cell --> 1 tick
2 cells --> 1 tick
3 cells --> 2 ticks
4 cells --> 5 ticks
5 cells --> 8 ticks

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x = 22, y = 5, rule = B3/S23
o4bo4bo4bo4bo$5bo4bo4bo4bo$11bo3bo4bo$16bo4bo$21bo!

6 cells --> 46 ticks:

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x = 6, y = 3, rule = B3/S23
2bo$2o2b2o$3bo!

7 cells --> 130 ticks:

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x = 7, y = 3, rule = B3/S23
6bo$2o2bobo$bo4bo!

8 cells --> 176 ticks:

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x = 8, y = 4, rule = B3/S23
5bo$2bo2b2o$obo4bo$2bo!

9 cells --> 229 ticks:

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x = 7, y = 4, rule = B3/S23
3bobo$bo3b2o$2bobo$2o!

10 cells --> 270 ticks:

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x = 7, y = 5, rule = B3/S23
3o$3bo$3bo2bo$3b3o$2bo!

11 cells --> 419 ticks:

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x = 14, y = 7, rule = B3/S23
4o$4bo4$8b5o$13bo!

12 cells --> 541 ticks:

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x = 20, y = 4, rule = B3/S23
19bo$bo9bo6bo$obo8b2o5bo$bo16b2o!

13 cells --> 738 ticks:

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x = 22, y = 7, rule = B3/S23
16b3o$2bo18bo$b2o18bo$21bo$19bo2$3o!

14 cells --> 780 ticks:

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x = 19, y = 9, rule = B3/S23
13bo$15bo$14bo$2bo13bo$b2o13bobo$17b2o3$3o!

15 cells --> 1071 ticks:

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x = 19, y = 8, rule = B3/S23
8bo$8b2o$17bo$o15bobo$obo14bo$3bo$2bo2b2o$5bo!

16 cells --> 1100 ticks:

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x = 22, y = 17, rule = B3/S23
16bo$16b2o5$10bo$10b3o4$2bo$2bo16b3o$2bo2$b2o$o!

17 cells --> 1247 ticks:

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x = 27, y = 25, rule = B3/S23
4b2o$5bo2$6b3o11$o$o$o23b3o6$7bo2$6b4o!

20 cells --> 1411 ticks:

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x = 20, y = 13, rule = B3/S23
3o$o4$10bo$10b2o$19bo$17b2o$16bo$5bo11bo$5bo9b2o$5b3o7bo!