BB(8)

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The 8-state, 2-symbol busy beaver problem BB(8) is unsolved and largely unexplored. It is thought to be almost certainly larger than Graham's number. The current champion is the BB(7) champion 1RB0RA_1LC1LF_1RD0LB_1RA1LE_1RZ0LC_1RG1LD_0RG0RF (bbch) by default.