TMBR: November 2025

Prev: October 2025

This Month in Beaver Research

Next: December 2025

This edition of TMBR is in progress and has not yet been released. Please add any notes you think may be relevant (including in the form a of a TODO with a link to any relevant Discord discussion).

Holdouts

• BB(6):
  • @mxdys released a holdouts list consisting of 1534 machines up to equivalence, which is a 6% reduction (84 machines)
  • @mxdys decided a holdout from 50 Random Holdouts by hand, making 11/50 solved. He also decided 5 more machines with a single strategy.
• BB(2,7):
  • The code provided by mxdys breaks up the BB(2,7) enumeration into 1 million subtasks which each run for ~10 minutes and leave ~2500 holdouts based on an average of the first 1K subtasks. These values are about 5 times longer than and 25 times larger than the ones for BB(7).
  • Terry Ligocki enumerated the first 2 subtasks, resulting in 62,062,284 holdouts, which can be found here.
  • The expected number of holdouts after the enumeration is ~2'500'000'000.

BB Adjacent

• TODO. Add BBFractan progress. (source: Discord channel https://discord.com/channels/960643023006490684/1362008236118511758 and more recently channel https://discord.com/channels/960643023006490684/1438019511155691521) and the wiki site itself. Included photo: https://discord.com/channels/960643023006490684/1438019511155691521/1438353120605503628
• TODO. Add BMS milestone improved by tromp from 350 to 331. (source: https://discord.com/channels/960643023006490684/1355653587824283678/1436844104742076507)
• TODO. Add Cyclic Tag.

TODO

• TODO. Graph of direct sim perf: https://discord.com/channels/960643023006490684/1226543091264126976/1438890558499061821
• TODO. Write a summary of what happened during BB(3,3) month (October) and BB(2,5) month (November).
• TODO. Add talk about BB https://discord.com/channels/960643023006490684/960643023530762343/1440090541936214017