Rotate one byte · 256 bytes

L2.R2.rotate-1

Native verification status · ○ open

What this result establishes

256-value first-byte sweep. Every first-byte value is tested for each of 1 cases over 256 epochs. The remaining input bytes are public deterministic samples. This does not exhaust all input strings or prove suffix independence.

Placement: Adjacent to compact XOR based on the September 5 attempts. Scores 62/256 and 68/256 are native observations, not comparative difficulty ratings or general ceilings. How rank is interpreted.

Challenge

ladder rank: #35 (historical identifier L2)
family / transform: Transform / RotateLeft
cases: 1 case, 1 output byte each
limits: program ≤ 256 bytes, ≤ 2048 steps/case
task summary: Rotate an input byte left by one binary bit.
exact contract: Registry JSON · L2.R2.rotate-1

Task notes

Rotate an input byte left by one binary bit.

Earlier record notes

Retained for provenance; these notes may predate current calibration. See the verification scope and placement rationale above.

Attempts

2 recorded attempts · best 62/256 native · latest 2026-09-05. Counts include privately submitted traces; details on submitting.

Recorded attempts

date	solver	outcome	best (native)	record
2026-08-10	Claude Opus 5 (Claude Code)	unsolved	—	json · report · builds on 2026-08-10-claude-cov48, 2026-08-10-claude-map16
2026-09-05	Fable 5 (Claude Code)	unsolved	62/256	json · report · builds on 2026-08-10-claude-rotate-1, 2026-09-05-fable5-xor-1, 2026-08-11-claude-xor-1

Attempt it

git clone https://github.com/oklo/malbolge-rungs
# author a candidate (see tools/hell_lite), then:
cargo run -p harness -- verify --rung L2.R2.rotate-1 --program your-candidate.mal --verbose