MARC2 Analysis Report

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

1000
Training Tasks
865
Solved by Claude
791
Validated Descriptions
326
MARC-Eligible
110
MARC-Verified Tasks
506
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)326
MARC-verified tasks110
Total MARC clues (all variants)506
Examples-only success rate25.8%
Language-only success rate59.4%

Valid MARC Puzzles (110 tasks)

Task IDmin_kDomainMetaphor
61biologyA leaning cell membrane stiffens as cytoskeletal filaments anchor its trailing edge
241Three wolves in sheep's clothing, and the lone sheep must be rescued from the flock.
261Four creatures trapped in walled-off rooms escape when the walls dissolve, huddling together in a shared den.
353mythologyColored runes are carved at different heights on a dark monolith. Each rune awakens, sending its power surging across...
452ocean/sailingSmall rafts of one or two lashed boats capsize in the green algal tide. Only flotillas of three or more vessels linke...
471architectureBlueprints for a single room were photocopied onto transparencies and scattered—each transparency shows only a few ti...
584biologyA cell divides along its spine, replicating itself in the direction its backbone runs
642A compass needle swings toward a distress flare, and rescue arrives where the flare was lit.
854astronomyGravitational lensing warps the image of a distant grid-like nebula — the bottom edge stays true, but each band of li...
901A compass rose unfurls its cardinal and diagonal beams from a jeweled core, while the equator belt cinches the world ...
912Two rivers flowing from a mountain peak reveal their true nature by their length.
1001astronomyThe night sky is full of stars from many constellations, each star seemingly alone. But one constellation's stars are...
1192A drumline marches in formation, and every third beat strikes the snare — painting it red.
1361astronomyNebulae in a galactic ring: their spectra redshift one position clockwise while their luminous reach blueshifts one p...
1411electronicsComponent clusters of various types are soldered onto isolated rectangular pads across a dark circuit board. The engi...
1511architectureThree pillars in a colonnade extend their foundations downward and throw flying buttresses sideways to brace against ...
1743The largest kingdom claims the throne.
1941astronomyA golden meridian divides two star charts. Red nebulae glow only where one chart shows a star and the other shows void.
2021A scale weighs azure ice against red fire, and the balance tips into shadow.
2071biologyIn a petri dish teeming with microcolonies, each species leaves a unique footprint. The dominant strain—the one that ...
2182architectureA building undergoes façade inversion — the exterior cladding retreats inside while the interior finish wraps the out...
2232Scattered seeds fall and pile into pyramids on the ground.
2272electronicsColored wire traces sheathed into a cable by gauge length
2291biologyA cell membrane encloses precious organelles while free-floating proteins drift in the cytoplasm around it.
2364mythologyThe Tower of Babel mid-collapse — divine wrath pins the foundation stones while each higher course of masonry is flun...
2451ocean/sailingA capsizing vessel lists apart—the sail and rigging above the waterline heel to port while the keel and hull below th...
2511mythologyA red oracle sits at the crossroads while green spirits gather in one quarter of the sacred grove. When the ritual ma...
2623biologyEach organism bears a single azure mutation at one extremity — a genetic compass needle. During mitosis, the cell col...
2703biologyA green nucleus pulses at the heart of the cell, and a red organelle undergoes mitotic division — splitting into iden...
2901astronomyTwo nebulae drift through the same region of space — wherever either cloud has matter, the overlap glows with new sta...
3023Breathing squares exhale inward, and the smallest take their deepest breath back out.
3172Rockets on a launchpad leap upward by their own height, hovering just above where they used to stand.
3192ocean/sailingFlotsam of different colors drifts in scattered patches across the sea; the tide pushes it all into a single reef — t...
3223astronomyA nebula drifts toward the accretion disk and settles against it, while a shock front forms on its outer boundary.
3494mythologyA phoenix is reborn in cycles of increasing splendor — a single spark, then twin flames, then a triple blaze — buildi...
3571A butterfly unfolds its wings from a single decorated panel pressed against the window of a cross-shaped frame.
3633astronomyTwin nebulae drift at the edges of a dark expanse, mirror images of each other, and the void between glows faintly wi...
3701Only in the silence between two conversations can you hear the whisper.
3812Butterflies pinned to a collector's board are removed and pressed into a field journal, spine to spine.
3871biologyTwo organisms, one dominant and one recessive, share the same niche. Where the dominant species cannot reach, the rec...
3891Compass needles trapped in amber, signaling their true north to the fortress walls
3981biologyThree species of lichen colonize the same rock face. The magenta fungus is most aggressive and claims any territory i...
4082musicAn orchestra warms up in cacophony, but four tuning forks hidden at the edges of the concert hall resonate at the sam...
4162biologyA cell biologist examines a tissue sample under the microscope. The diversity of cell types determines whether the or...
4171sportsA formation with a gap in its corner launches the ball through the opening, and it rolls diagonally across the field ...
4181biologyA cellular biologist stains tissue samples under a microscope, applying different fluorescent dyes depending on how m...
4211A vampire stands before a mirror that reveals not its reflection, but the negative space where it should be.
4302biologyCertain enzymes along a chromosome express themselves differently depending on their type, sending protein chains of ...
4321A mandala holds its full truth in a single petal.
4331mythologyFallen souls descend one tier toward the River Styx; any soul that touches the river's edge is seized and split into ...
4402Saplings at the riverbank grow to full trees, but full-grown trees uproot and cast their shadows on the far shore.
4432astronomyA yellow pulsar whose beam skews to one side causes the azure nebula to project its mirror image into the adjacent void.
4492biologyA membrane separates living tissue from decay — below it, cells multiply to fill every gap; above it, necrosis claims...
4544biologyA cell undergoes mitotic division, but each daughter inherits the mother's memory at a different angle of the spindle...
4601biologyA single stem cell divides along two axes, and the daughter cells inherit different gene expressions depending on whi...
4612biologyCells in a tissue matrix absorb the dominant signal from their surrounding membrane receptors.
4673warfareA fortress holds the center, but sappers have already breached at the corners and now tunnel outward, digging one tre...
4751A mirror hangs on the wall, and everything reflected in it appears in swapped colors.
4772A butterfly unfolds its wings from a single scale pattern.
4792A grey kingdom gazes into a mirror and sees its own face repeated in each of its provinces.
4961biologyA tissue sample under the microscope: green and blue proteins form a structural lattice, while the unpigmented inters...
4991Two rival plants compete for sunlight, and the one that grows more after the fence wins the garden.
5001biologyA row of cell cultures in petri dishes, each showing different levels of colony growth across their sample layers. Th...
5351electronicsOn a dark circuit board, several blue chip arrays are mounted in separate zones. Within each array, a few transistors...
5361astronomyA constellation maps its own stars onto the sky — each bright star in the constellation projects the whole pattern on...
5432biologyIn a petri dish teeming with competing colonies, the species that outgrows all others leaves its signature protein fo...
5522A pebble dropped in a pond sends out ripples painted in the colors of a rainbow overhead.
5613biologyTwo cell membranes, each with protein channels, are layered over a tissue. Only where both membranes have open pores ...
6023mythologyA runic inscription at the corner of a sacred threshold is chanted once for every stone in the temple wall, and each ...
6111astronomyA telescope's CCD captures a grid of nebula segments separated by diffraction spikes of a single wavelength. Each seg...
6201A kite drifts home to the center of its flying field.
6482electronicsA circuit board is folded along its center trace. Wherever solder pads align across the fold, current flows and they ...
6521biologyBlue colonies drift on a dark petri dish. Azure mutations appear within some colonies — a single mutation is benign, ...
6551astronomyA comet traces the longest diagonal corridor through a nebula's dust lanes.
6621An archaeologist restores the largest damaged section of a mosaic floor.
6742biologyTwo nuclei in a shared cell each emit chemical signals along their axes. Scattered organelles that detect the right s...
6831A spy encrypts messages using a codebook, and you must decode a new message using the same cipher.
6961danceTroupes leaping by the collective spring of their dancers
7052electronicsTwo charged terminals on the same trace reach toward each other, each building up a capacitor plate at the point of n...
7062mythologyA demigod touches a stone idol and their divine essence flows through every crack, transforming the whole statue — th...
7182sportsPlayers on a field claim territory based on how many rival teams showed up to the tournament — more competitors, more...
7231An elevator descending floor by floor — predict which floor it arrives at next.
7241biologyA colony of golden cells stretches across three tissue layers. The central artery pulses strongest, and at regular in...
7311ocean/sailingCargo loads into a hull only when every crate fits a hold and every hold gets a crate — mismatched manifest and the s...
7832Two lighthouses signal each other across a dark sea, and their crossing beams trace a cat's eye on the water.
7841biologyGenes express only when both parents carry the trait — recessive alleles in flanking cells activate the dormant center.
7982biologyThree genes compete for expression in the same tissue, and dominance determines which phenotype shows.
8133theaterAmber spotlights lock onto each other across the stage, and every actor caught in the cross-beam is revealed in costu...
8161A rising flood fills a walled courtyard but cannot enter the sheltered pavilion.
8171astronomyStars along a three-band constellation chart — the terminal star's position in the sky determines which stars flare i...
8181musicThe green chord resonates at center stage, and only those notes tuned to its frequency sustain their tone along the s...
8193biologyCells of a single species colonize the petri dish in unpredictable clusters, but every species folds into the same ge...
8201A mirror reveals what's missing and what's imagined — ghosts glow blue, and memories burn red.
8272Only the dancer whose reflection is perfect earns a place on the stage.
8693Each ribbon sends a secret signal to the lighthouse, but the signal's color is alchemically transmuted by the ribbon'...
8952A green laser beam bounces off prisms in a dark room
9161mythologyGrey serpents coil through the underworld's darkness, each serpent a single unbroken body that never entwines with an...
9211biologyFour strains of bacteria colonize a petri dish divided by nutrient barriers. When the barriers dissolve, they compete...
9316geologyFour mineral veins intersect in a cross-section, and at every point the hardest mineral displaces the softer ones.
9393biologyA enzyme reads the folding pattern of a receptor protein and activates a pigment gene, dyeing a nearby cell cluster i...
9413astronomyThree spectral filters are mounted on a telescope's eyepiece column. They peer down at a star chart full of colored n...
9651astronomyA few colored stars ignite in an otherwise dark sky. Each star's gravitational pull compresses its entire meridian in...
9661biologyA virus carries its protein coat encoded around a dormant nucleus; wherever receptor sites glow on the membrane, the ...
9771biologyA geneticist reconstructs a corrupted segment of DNA by recognizing the codon repeat cycle that governs the rest of t...
9822astronomyA constellation duplicates itself at the far diagonal of an expanding universe, and wherever binary stars face each o...
9831theaterTwo stagehands pin marks on one edge of the curtain. When the cue comes, the curtain is cut along its center seam and...
9851A clam opens its shell and reveals the pearl's negative image inside each half.
9872sportsThe championship arena's lines are repainted in the visiting team's color after fans storm the field.
9881Each building casts a green shadow whose length reveals how many departments work inside.
9961An election within a walled city — the majority faction tears down the old walls and rebuilds them in its own color, ...