MARC2 Analysis Report

March 26, 2026 — Subject model: gemma-4-31b

1000
Training Tasks
865
Solved by Claude
791
Validated Descriptions
310
MARC-Eligible
96
MARC-Verified Tasks
445
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)310
MARC-verified tasks96
Total MARC clues (all variants)445
Examples-only success rate37.8%
Language-only success rate68.2%

Valid MARC Puzzles (96 tasks)

Task IDmin_kDomainMetaphor
61biologyA leaning cell membrane stiffens as cytoskeletal filaments anchor its trailing edge
141Each star casts a shadow of everything it is not.
351biologyLone cells floating in a dark medium each emit a hormone that claims surrounding tissue. Each cell's signal spreads h...
451astronomyLone stars and binary pairs lack the gravitational pull to resist the green nebula's expansion. Only star clusters of...
471biologyScattered cells carry genetic memories of a single organism they once formed. Each drifts near a nucleus remnant, rem...
582electronicsThe signal propagates down the bus where the ground rail runs — one clean rail of uniform voltage sets the data path
852biologyA ribcage breathes — as each rib rises from the diaphragm, it rocks gently left, then center, then right, then center...
901A compass rose unfurls its cardinal and diagonal beams from a jeweled core, while the equator belt cinches the world ...
1002astronomyThe night sky is full of stars from many constellations, each star seemingly alone. But one constellation's stars are...
1081A painter's palette holds swatches above a workbench, and scattered paint drops on the bench bloom into full brushstr...
1143Green footsteps leave echoes that scatter like reflections in a funhouse mirror.
1361astronomyNebulae in a galactic ring: their spectra redshift one position clockwise while their luminous reach blueshifts one p...
1411architectureAcross a dark cityscape, buildings of various materials stand as isolated blocks. The city planner drafts a skyline e...
1421A stained-glass window template is filled with light filtered through a colored lens strip.
1511biologyThree nerve endings in the brain stem sense distant organs and grow axons toward them, branching laterally upon arriv...
1812A stained-glass window reveals the hidden garden beneath the frost.
1841A river runs through a canyon, and the colored rock strata flood outward to reclaim the empty sediment between them.
2021A scale weighs azure ice against red fire, and the balance tips into shadow.
2062A gemstone is cut open, and its internal layers spill out like light through a prism.
2271musicNotes ranked by duration composing a resonance mandala
2361biologyA cell's membrane shears under directional stress, its base rooted to the substrate while its upper structures lean a...
2452biologyA cell prepares to divide: the upper organelles drift toward one pole while the lower organelles migrate toward the o...
2622mythologyEach colored titan sleeps as a rectangular monolith with one azure rune glowing at a corner — the awakening glyph. Wh...
2701biologyA green nucleus pulses at the heart of the cell, and a red organelle undergoes mitotic division — splitting into iden...
2783A compass needle summons its companion — the red weathervane on the roof tells which direction the wind blows them to...
2842A bathtub overflows through its broken edge, flooding both the tub and the hallway beyond.
2921geologyA seismic wave propagates diagonally through bedrock, hits a dense magma intrusion, and refracts back at a symmetric ...
3101Every treasure chest needs a display case, and open chests reveal gold inside.
3192biologyCells in a petri dish compete for territory; the most abundant organism claims the outer membrane, while rarer specie...
3222biologyA cell migrates toward the membrane wall, and a cytoskeletal filament crystallizes along its trailing edge.
3491biologyA single cell divides with increasing vigor — each generation larger than the last — until it reaches its peak vitali...
3801A lighthouse beam reaches toward ships, and its twin on the far shore shines across the entire sea.
3872biologyTwo organisms, one dominant and one recessive, share the same niche. Where the dominant species cannot reach, the rec...
4003biologyA cell membrane dissolves, but its proteins are redistributed along the rows where the chromosome's active genes glow...
4061Heavy boulders sink to the riverbed while pebbles float in place.
4083astronomyThe night sky is cluttered with stars and nebulae of many colors, but four pulsars of the same rare wavelength sit at...
4162biologyA cell biologist examines a tissue sample under the microscope. The diversity of cell types determines whether the or...
4171electronicsA circuit board with a missing component at one corner of a chip leaks current through the gap, the charge arcing dia...
4182biologyA cellular biologist stains tissue samples under a microscope, applying different fluorescent dyes depending on how m...
4302biologyCertain enzymes along a chromosome express themselves differently depending on their type, sending protein chains of ...
4331geologyBoulders tumble one stratum downward; any boulder striking the magma intrusion fractures and sends two pyroclastic st...
4402Saplings at the riverbank grow to full trees, but full-grown trees uproot and cast their shadows on the far shore.
4412astronomyTwo galactic filaments cross in the void, and at their junction a pulsar emits square wavefronts — luminous shells an...
4431cookingA yellow mold with an off-center spout pours a flipped azure batter beside the original cake.
4443danceFour dancers in colored costumes hold a tight square formation. The choreographer mirrors the formation at double sca...
4492biologyA membrane separates living tissue from decay — below it, cells multiply to fill every gap; above it, necrosis claims...
4544ocean/sailingA cartographer draws a single chart of an island and pins four copies to the navigation table, each turned so a diffe...
4601electronicsA circuit board's bus lines carry four different voltage signals, and each chip region on the board lights up in the ...
4611weatherCalm valleys between mountain ridges fill with the weather front that dominates their surrounding peaks.
4941A picture frame holds a window, and a wandering puzzle piece finds its way home inside.
5001biologyA row of cell cultures in petri dishes, each showing different levels of colony growth across their sample layers. Th...
5062A quiet room with tripwires — disturb one spot and the whole row and column light up.
5201Seeds scattered in a field grow into square garden plots arranged by size at harvest time.
5362geologyA crystal seed grows copies of its own lattice structure into every vein where its own mineral deposits are present —...
5542A compass rose casts colored shadows diagonally away from its heart.
5962electronicsA signal pattern is loaded into the lowest registers of a shift buffer; the clock pulses it upward through the empty ...
6481astronomyStars in a galaxy are caught in a gravitational fold along the galactic plane. When a star's antimatter twin exists o...
6521biologyBlue colonies drift on a dark petri dish. Azure mutations appear within some colonies — a single mutation is benign, ...
6561A fortress casts its shadow outward, but the shadow carries the color of the treasure locked inside.
6601biologyA single mutant cell in dormant tissue triggers a cascade of differentiation, each generation of daughter cells expre...
6641Tree rings reveal the age of the world, each colored seed growing outward from the heartwood.
6743biologyTwo nuclei in a shared cell each emit chemical signals along their axes. Scattered organelles that detect the right s...
6961cookingDough rising in the oven's heat
7051ocean/sailingTwo ships on the same heading unfurl their yardarms as they close distance, the canvas spreading wide across the beam...
7061gardeningA single bee dusted with pollen lands on one petal and the entire flower blooms in that pollen's color — then the bee...
7151A stone dropped in a walled pond sends out ripples that alternate between warm and cool.
7311A lock only turns when the right key fits perfectly into its grooves.
7411biologyCell membranes exchange their protein coats during mitotic inversion
7841dancePartners mirroring the same step from opposite wings cue the center dancer to join in — a solo flourish from one side...
7861musicA short musical phrase insists on being heard — it echoes across the orchestra pit, each instrument picking it up unt...
7961Fountains erupt through broken aqueducts, each geyser painting the sky with the colors of the pipes it bursts through.
7981biologyThree genes compete for expression in the same tissue, and dominance determines which phenotype shows.
8061biologySpores released from scattered fungi drift on a gentle southeast wind, each one depositing copies of itself as it flo...
8132geologySulfur crystals mark the vents at either end of a fissure, and the mineral deposits between them are pressure-cooked ...
8151electronicsBlue transistors sit on a dark circuit board. When powered, each transistor drives current through four colored trace...
8202A mirror reveals what's missing and what's imagined — ghosts glow blue, and memories burn red.
8521Rain falls until it finds a bucket that can hold it.
8603Scattered birds return to roost on a single wire at dusk
8752biologyA mother cell's nucleus carries the genetic signature. When the daughter cell bearing the same DNA is found in the ti...
8933biologyAmong the petri dishes, the colony with the most aggressive infection is isolated for study
8954A green laser beam bounces off prisms in a dark room
8993Scattered breadcrumbs召 home the lost puzzle pieces they fell from.
9082Three surveyors plant flags and a fence rises to enclose their claim.
9103astronomyPlanets in a resonant chain swap their ring configurations with their outward neighbor at each conjunction. Predict t...
9141A hall of mirrors where one mirror has smudges — clean the glass and mark where the smudges were.
9152A doctor diagnoses dark wounds on grey skin — their color reveals how badly the infection has spread.
9211biologyFour strains of bacteria colonize a petri dish divided by nutrient barriers. When the barriers dissolve, they compete...
9311biologyFour colonies compete for territory in a shared petri dish, but some species are simply more dominant.
9411mythologyThree patron gods occupy shrines along a sacred column above the mortal realm. Each god favors one color of offering....
9653musicOn a silent staff, a few notes ring out. Each string they touch resonates completely, humming in azure, while the str...
9663electronicsA circuit traces paths around a dead socket; wherever a solder joint glows hot, the same circuit is etched onto the b...
9771astronomyAn astronomer reconstructs a corrupted region of a star map by exploiting the crystalline periodicity of stars in a l...
9821cookingA chef plates the same dish twice on a diagonal, and between every pair of garnishes, a stripe of pesto is drizzled a...
9832biologyTwo enzyme markers bind to the membrane wall, triggering mitosis in reverse — the cell cleaves along the marked axis,...
9871biologyA host organism's membrane absorbs the pigment of the dominant parasite, while the smaller symbiont withers away unno...
9955electronicsA shift register clocks a pattern of colored signals diagonally across a dark LED matrix, each clock cycle advancing ...