1RB0LC_1LC0RD_1LF1LA_1LB1RE_1RB1LE_---0LE

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Unsolved problem:
Does this TM halt? If so, how many steps does it take to halt?

1RB0LC_1LC0RD_1LF1LA_1LB1RE_1RB1LE_---0LE (bbch) is a probviously halting tetrational BB(6) Cryptid found by Racheline on 23 Nov 2024 (Discord link).

1RB0LC_1LC0RD_1LF1LA_1LB1RE_1RB1LE_---0LE is a tetrational probviously halting cryptid. the lower bound for when it halts is around 10^10^120395, and with each exponentiation it has a 1/4 chance of halting, so i think the expected halting time is around 10^10^10^10^10^120395 sadly we won't be able to run it any further, it uses the hydra map which we don't have a way to accelerate

On 21 Sep 2025, mxdys has shown that this machine is in an equivalence class of 3 machines:

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