Swap nibbles · four bytes

L5.R0.future-transform

Native verification status · ○ open

What this result establishes

256-value first-byte sweep. Every first-byte value is tested for each of 4 cases over 256 epochs. The remaining input bytes are public deterministic samples. This does not exhaust all input strings or all multi-byte tuples.

Placement: Provisional placement: width and program limits both vary. The interrupted September 5 campaign supplies no completed new result for this rung. A failed single-byte attempt is not an impossibility proof for this task. How rank is interpreted.

Challenge

ladder rank: #39 (historical identifier L5)
family / transform: Transform / NibbleMap
cases: 4 cases, 4 output bytes each
limits: program ≤ 1024 bytes, ≤ 1000000 steps/case
task summary: Extend nibble swapping to four bytes within 1,024 bytes of code.
exact contract: Registry JSON · L5.R0.future-transform

Task notes

Extend nibble swapping to four bytes within 1,024 bytes of code.

Earlier record notes

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

Reserved future rung (nibble map, 4 cases).

Attempts

1 recorded attempt · best 0/1024 native · latest 2026-08-10. 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	0/1024	json · report · builds on 2026-08-10-claude-cov32

Attempt it

git clone https://github.com/oklo/malbolge-rungs
# author a candidate (see tools/hell_lite), then:
cargo run -p harness -- verify --rung L5.R0.future-transform --program your-candidate.mal --verbose