1RB3LB1RZ2RA_2LC3RB1LC2RA_3RB1LB3LC2RC

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1RB3LB1RZ2RA_2LC3RB1LC2RA_3RB1LB3LC2RC (bbch) is a halting BB(3,4) TM. It was discovered in April 2024 by Pavel Kropitz. It achieves a score of exactly $(2 ↑^{15} 5) + 14$ , making it the current BB(3,4) champion. Shawn Ligocki confirmed the TM's score.

Another long running TM, 1RB3RB1LC2LA_2LA2RB1LB3RA_3LA1RZ1LC2RA (bbch), is a permutation of this TM, obtained by starting it in state B and then converting to TNF.^[1]

References

↑ Shawn Ligocki, 2024. https://www.sligocki.com/2024/05/22/bb-3-4-a14.html Accessed 25. October 2025.

[1] Shawn Ligocki, 2024. https://www.sligocki.com/2024/05/22/bb-3-4-a14.html Accessed 25. October 2025.

[1]

1RB3LB1RZ2RA_2LC3RB1LC2RA_3RB1LB3LC2RC

References

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