MARC2 Analysis Report

March 26, 2026 — Subject model: gpt-oss-20b

1000
Training Tasks
865
Solved by Claude
791
Validated Descriptions
296
MARC-Eligible
67
MARC-Verified Tasks
261
Total MARC Clues

Key Metrics

MetricValue
Training tasks1000
Solved by Claude865 (86.5%)
Validated descriptions791 (91.4% of solved)
MARC-eligible (lang_suff + both_req)296
MARC-verified tasks67
Total MARC clues (all variants)261
Examples-only success rate11.0%
Language-only success rate42.1%

Valid MARC Puzzles (67 tasks)

Task IDmin_kDomainMetaphor
12A narcissistic painting reproduces itself wherever it sees its own reflection.
21A chameleon reads a mood ring to decide what color to wear.
61mythologyA crooked rune inscribed on shadow-stone is straightened by the right hand of the glyph-keeper
402A cartographer surveys walled provinces and draws one dot on a map for each.
454geologyMineral deposits too small to mine — just a crystal or two — oxidize to green copper patina under exposure. Only vein...
583biologyA cell divides along its spine, replicating itself in the direction its backbone runs
821Two monarchs divide a kingdom, each stamping their seal upon their domain's walls.
1281Lighthouses signaling across the darkness
1381A royal decree summons only the knights whose company matches the king's court size to raise their banners above the ...
1511electronicsThree voltage sources on a circuit board's top rail send current down through traces until each finds a grounded comp...
1735Every creature casts a shadow at sunset, and the wallpaper repeats itself endlessly.
1781Two dancers audition for the same spotlight — only a solo performer gets to shine.
1941biologyA membrane separates two colonies of cells. Only the mutations unique to one side survive the selection pressure.
2271Russian nesting dolls carved from colored sticks
2291ocean/sailingA ship's porthole frames the sea — barnacles on the hull outside the glass don't change the view.
2711Lonely magnets calling their partners home across a dark corridor.
2904ocean/sailingTwo captains chart hazards on the same waters — their combined map warns of every reef either one spotted.
2921ocean/sailingA current flows diagonally across open water, strikes a sea wall, and the undertow reverses its crosswise drift.
3192cookingIngredients scattered across the counter are layered into a terrine — the most plentiful ingredient wraps the outside...
3633astronomyTwin nebulae drift at the edges of a dark expanse, mirror images of each other, and the void between glows faintly wi...
3871astronomyTwo nebulae of different spectra drift into the same region of space. The larger nebula claims most of the void, but ...
4101A golden firefly lights up one room of a dark mansion, and its glow tells the mirror where to reflect that room.
4171ocean/sailingA damaged sail with a torn corner lets the wind through, and the escaping gust drives a wake of foam diagonally acros...
4181biologyA cellular biologist stains tissue samples under a microscope, applying different fluorescent dyes depending on how m...
4191A photographic negative reveals what was hidden in the shadows
4302geologyMineral veins trapped in a bedrock stratum erupt under tectonic pressure — basalt intrusions push farther than quartz...
4331weatherHailstones fall through the sky; when one strikes the thermal inversion layer, it fractures and sends ice shards scat...
4431cookingA yellow mold with an off-center spout pours a flipped azure batter beside the original cake.
4541danceFour couples learn the same choreography but start facing different walls of the ballroom—when the music plays, the i...
4671biologyA cell nucleus sends out tendrils of cytoplasm, each filament stretching toward the membrane wall along the path firs...
4883biologyA single spore settles one layer deeper into the tissue, and from where it was, hyphae streak upward through every ot...
4973Colored picture frames display different paintings depending on the size of their canvas.
4991Two rival plants compete for sunlight, and the one that grows more after the fence wins the garden.
5133Three witnesses agree on what happened, but one tells a different story.
5433biologyIn a petri dish teeming with competing colonies, the species that outgrows all others leaves its signature protein fo...
5611biologyTwo cell membranes, each with protein channels, are layered over a tissue. Only where both membranes have open pores ...
6161An archer shoots through a field, and the arrow punches a hole in the castle wall.
6481biologyCells in a petri dish carry genetic markers. When a cell finds its twin across the body's axis of symmetry, their sha...
6741geologyTwo magma vents pierce a dark plain — one glowing blue-hot, one red-hot. Orange mineral deposits have crystallized al...
6841A rain gauge measures the empty sky above the waterline.
6961ocean/sailingCargo crates buoyed upward by the air pockets sealed inside
7002A balloon inflates toward the pin that would pop it
7061weatherA single lightning bolt strikes one edge of a cloud and electrifies the entire formation with its color, while the bo...
7181biologyCells in a tissue multiply through mitosis, each dividing more aggressively the more diverse the population around th...
7242astronomyThree bands of golden stars stretch across the ecliptic. The central band is a dense river of light, while the upper ...
7312biologyA cell membrane only absorbs molecules whose shape perfectly matches its receptor sites. Mismatched molecules bounce ...
7332ocean/sailingTwo flotillas converge from port and starboard toward a rendezvous point — the harbormaster's log marks every berth o...
7864astronomyA constellation is glimpsed through a small telescope aperture. Pull back, and the universe reveals that pattern repe...
7904A mirror lake reveals which stars have true reflections
7921biologyTwo strands of DNA, one coding for cold pigment and one for warm, are spliced together across a membrane. Wherever ei...
7951Trees sink their roots into underground water
8061biologySpores released from scattered fungi drift on a gentle southeast wind, each one depositing copies of itself as it flo...
8151danceBlue dancers stand poised on a dark ballroom floor. At the downbeat, each dancer extends four limbs — one reaching to...
8171mythologyRunes carved along three branches of Yggdrasil, one per notch. The final rune's nature — root or crown — determines w...
8181The emerald hearth draws travelers home by the roads they already walk.
8194biologyCells of a single species colonize the petri dish in unpredictable clusters, but every species folds into the same ge...
8223Two old friends find each other by sending golden roads through the city grid.
8633Kingdoms compete to attract the most wandering fireflies.
8721astronomyA comet oscillating between the gravitational pulls of two binary stars
8801A mirror stands in a hall, and scattered guests on both sides step through to reunite.
9341A cannon fires its payload through the gap in a fortress wall
9392biologyA enzyme reads the folding pattern of a receptor protein and activates a pigment gene, dyeing a nearby cell cluster i...
9652ocean/sailingColored buoys float at scattered positions in a dark sea. Wherever a buoy is anchored, the entire shipping lane benea...
9712biologyA cell colony where the dominant species overwhelms the culture dish, but the researcher only cares about the rare mu...
9771weatherA meteorologist fills in a satellite image's dead pixels by extending the perfectly periodic pressure-front pattern v...
9821biologyA cell undergoes mitosis along its diagonal axis, and wherever chromosomes face each other across the cytoplasm, a ba...
9881Each building casts a green shadow whose length reveals how many departments work inside.