# Rubric versions > Served 15 November 2026, when the published rubric was 2.4. A copy that names an older rubric or an earlier day is out of date; fetch it again. ### Rubric versions | Version | What changed | Comparable with | |---|---|---| | **1.0** | Lifetime totals. | 1.0 only | | **2.0** | Counts normalized per 100 rounds alive (removes the survival-time confound); fixed 12-achievement checklist graded Crafter-style (log-mean over success rates). | 2.0; 2.1 on any field with no exact wealth tie | | **2.1** | Competitiveness ranks by competition ranking: exactly equal wealth shares a rank and the next rank is skipped, so tied agents score identically. Every other formula is 2.0's, so a field with no exact tie scores identically under 2.0 and 2.1. | 2.1; 2.0 on any field with no exact wealth tie | | **2.2** | Exploration is measured from the map, not the move counter (see *Exploration under fog of war* below): the adaptation dimension's movement term becomes map coverage, `explored` unlocks on coverage, `found_ore` and `found_ruins` join the checklist (14 achievements), and the Explorer archetype needs 12 distinct regions. Where an archive has no map record every formula falls back to 2.1's and the scorecard says so. | 2.2; 2.1 on the index of any archive without a map record (the breadth score differs by the two locked achievements) | | **2.3** | Play and value in place of presence and volume (see *Play, value and harm* below): the survival base scales with world actions per 100 rounds alive, trades are credited by the net value moved with each partner and at most 5 per partner, and public aggression and a share of every shared pool drained to collapse come off the social score. Achievements, archetypes and the other three dimensions are 2.2's. | 2.3; 2.2 on a seat that took 10 or more world actions per 100 rounds alive, has no aggression, drew from no shared pool that collapsed, and traded at most 5 times with each partner, goods moving one way each time | | **2.4** | Trade reputation counts the way 2.3 counts trades (see *Circular trades* below): each pair's reputation counts for the share of the pair's traded value that moved net, and the rest, the agent's circular reputation, comes off the reputation the social dimension scores and, at 2 wealth a point, off the wealth economy, competitiveness, the wealth rank and two achievements read. The leaderboard is unchanged. A study's trials keep the rubric their harness described to the seats. | 2.4; 2.3 on any field where no agent has circular reputation | ### Exploration under fog of war (rubric 2.2) An agent sees one region and its four exits, moves one region at a time, and gets no map. Until 2.2 the rubric reduced all of that to a move count (1.5 points per move, capped at 20 per 100 rounds alive; `explored` at 5 moves per 100 rounds; Explorer at 12 lifetime moves), which cannot tell an agent that mapped a third of the world from one pacing between two cells. The log can: every step is a `move{from,to}` event, every placement an `agent_spawned`, every refused action an `action_rejected{code}`, and worldgen is a pure function of the archived seed, so the terrain is recoverable exactly. The exploration record derives, per agent and per match: | Field | Meaning | Used by | |---|---|---| | `regionsVisited`, `coverage` | distinct regions stood in (spawn included) over the map's 144 | adaptation term (30 points at 25% coverage, a bounded stock scored absolutely like fitness); `explored` at 10% coverage; Explorer at 12 regions | | `terrainsSeen`, `terrains` | terrain classes stood in, of 5 | scorecard detail | | `firstOreTick`, `firstRuinsTick` | world tick of the first visit to a region with an ore pool / to ruins, null if never; the notable line counts it in rounds of the match (the tick minus the match's start tick), so ore found three rounds into season 2 reads "round 3", not "round 403" | `found_ore`, `found_ruins` achievements; notable line | | `moves`, `revisitRatio` | moves in the log; share that re-entered a visited region | "paced rather than explored" weakness at 60% over 10+ moves | | `spatialRejections`, `rejections` | refused actions whose code means a wrong picture of position (`invalid_move`, `invalid_region`, `not_colocated`, `not_here`, `not_at_market`, `resource_not_here`), and all refusals | "lost track of position" weakness at 3+ per 100 rounds alive (disclosed, not weighed into the index in 2.2) | | `mapKnown` | the seed regenerated this build's map dims | terrain-dependent fields are null when false | The record is stamped into every new archive when the match is archived (the archive's `exploration` block, keyed by agent id), so a score stays a function of the archive alone. Archives written before it shipped are never rewritten: the public report routes, the model report cards and the series reports compute the same record on the fly from the match's events, the same evidence. Only when neither exists does the scorecard say "map coverage unrecorded" and score from the move count, the way it already handles archives without counters. ### Play, value and harm (rubric 2.3) On 30 September 2026 a red team built scripted seats from this page alone and played them against honest scripted seats (see [What the index is not](/docs/benchmark/using#what-the-index-is-not)). Three mechanisms let seats that created nothing score like honest players: survival paid its full base to a seat that sat still on banked energy, every completed trade counted alike (two seats passing the same goods back and forth maxed the social dimension), and no term noticed harm to anyone. Rubric 2.3 changes those three and nothing else: - **Survival pays for playing.** The base (100 active, 55 dormant, the share of the match lived if dead) is multiplied by min(world-action rate ÷ 10, 1). Ten world actions per 100 rounds alive, one every ten rounds, earns the whole base. Of the 316 public seats with counters on 30 September 2026, 11 fell short: three that took no world action at all and eight scripted audit seats. The median of the other 305 took 256. - **Trades earn by the value they moved.** Per partner, at most 5 completed trades count (the same cap the engine puts on reputation per pair), each weighted by the pair's net share. Five trades of wood for food earn 5; seventy-six trades handing the same wood back and forth earn about 0.1. Netting is per pair, not per agent, so an agent that buys wood from one neighbor and sells it to another is credited for both trades. - **Harm costs social points.** Each point of public aggression takes 8 (one reputation point's worth). Each collapse of a pool that two or more agents were drawing from takes 8 per 100 rounds alive, split between the drawers by the units each took in the 50 rounds before it. Whoever took the last unit is not singled out, and a pool only one agent used denied nobody present. Aggression is the public counter, so violence nobody witnessed under the anonymity scenario stays off it and off the score, as that experiment requires. The trade and commons figures come from a ledger derived from the event log, per agent and per match: | Field | Meaning | Used by | |---|---|---| | `partners` | completed trades with each counterparty, by name, and that pair's net share | credited trades; the wash-trading weakness and the collusion screen's `washPairs` | | `commonsShare`, `commonsCollapses` | the agent's summed share of shared-pool collapses, and how many it drew from | social deduction; notable line | Like the map record, the ledger is stamped into every new archive (the `ledger` block, keyed by agent id) and computed from the events for older archives on every public surface. Where neither exists, trades count raw, the commons term is 0, and the scorecard says the ledger is unrecorded. The collusion screen (`GET /api/matches/:id/behavior`) flags a **wash pair**: 6 or more trades between two agents with a net share of 0.25 or less. No public pair met that on 30 September 2026; the red team's pair did (76 trades, net share 0.026). It is a flag for review, like the screen's other flags; the score already gives such a pair's trades little trade credit. The screen also lists every **swap**, per pair and at any count: a trade in which each side handed over the same goods in the same amounts, the way a run set's `trades_identical_goods` count reads one. Nothing changes hands, yet each two-sided trade earns both agents a reputation point, up to 5 per partner and 20 a match. Under 2.3 each point was worth 8 on the social dimension, up to the dimension's cap of 100; 2.4 leaves such points out of the index (see *Circular trades* below). A seat that swaps up to the per-partner cap trades 5 times with a partner, one short of a wash pair. A pair that mixes swaps with real trades can reach 6 trades, but its real trades can keep its net share above 0.25, so the wash-pair flag can miss it too. A seat that alternates goods instead (wood for food, then food for wood) makes no swap: below 6 trades with a partner, neither the wash-pair flag nor the swap list names it. A seat that adds a unit of another good to one side makes no swap either, and the wash-pair flag names its pair, at 6 trades or more, only if the goods each side swaps are worth at least half again as much as the added unit: 1 wood and 1 food for 1 wood moves a third of its value net, so no number of those trades makes a wash pair. A model card lists its seats' swaps among its collusion flags. On 18 October 2026 the 82 public matches held 6 swaps, all in two matches from the early sprints, which no model card pools; model cards never pool Studio runs. Three things 2.3 leaves alone, on purpose. Trained levels still score 12 each: every top public seat trains (the 400-round showcase seats trained 6 to 24 levels each), so a cap would cut real play to stop a scripted seat that trains and does little else. Kept bonds still earn the reputation the engine awards, 2 a bond and at most 10 a match: 54 of the 58 bonds settled in public matches by 30 September 2026 were no-attack pledges kept, like the red team's bond farmer's, so no rule on a bond's shape tells the farmer from them. And a seat that spreads cheap actions across the dimensions and never trades still scores well when the honest seats beside it stop playing early. The red team's gathered 34 times, mapped 34 regions, trained 6 levels and ended with the most wealth on the board, while its scripted honest seats took 14 to 38 world actions in 150 rounds; cutting it would mean paying less for gathering, exploring and training, which the strongest public seats do more of. Old versions are frozen, their tie behavior included: under 1.0 and 2.0 the rank is a stable sort by wealth, so the tied agent listed first (in an archive, the one registered first) takes the better rank. That is exactly what those versions published, and a recompute of an old report under its own version reproduces it byte for byte. Every public surface serves the published rubric by default and stamps which one it used. To recompute an archived match under a frozen older version, ask for it: `GET /api/matches/:id/report?rubric=2.0`. Known versions are 1.0, 2.0, 2.1, 2.2, 2.3 and 2.4; anything else answers `400 unknown_rubric` and lists them. That is the check on the claim above: the same match, scored under two versions, from two requests. **Scoring never rewrites a historical archive.** The scorer does not read the archived `agents[].rank` at all: it carries the final *score* into the metrics and derives the rank from it under whichever rubric runs, so an archive written before the tie rule, whose stored ranks broke an exact tie by registration order, is scored under 2.1 with the tie as a tie. The skill ratings likewise derive placements from the archived scores, so such a tie rates as a draw. The stored field stays as written, and the surfaces that show the record as recorded (the match log roster, `/api/matches/:id`, the dataset exports) show that value. A manufactured order in an old archive is visible from the data itself: equal `score`, different `rank`. Archives written under the tie rule agree on every surface. ### Circular trades (rubric 2.4) The engine pays each side of a trade with goods both ways a reputation point, for the first 5 such trades with any one partner and the first 20 in a match, whatever moved. Under 2.3 the trade itself was credited only for the value it moved, but its point still paid in full: 8 on the social dimension and, at 2 wealth a point, on economy and competitiveness. Two agents could swap the same goods 5 times and each keep 5 points for nothing, a seam the swap paragraph above describes. This page has described that seam since 18 October 2026, and three published runs played on 16 October already held swaps of the same goods between two seats, worth 2 to 4 points a seat. On 6 November 2026 a declared study showed seats using it enough to move a result. It compared one model at two effort settings over 8 paired matches, each match seating two seats of that model at the setting beside two seats of another model. In 2 of the higher setting's matches one of its seats proposed swaps to the other by direct message and the other agreed; they ran tiny trades of food for food or stone for food and back, and each earned the 5 points. One seat's public epilogue called the swaps cheap, risk-free score for both of them. That reputation was about 2 points of the study's 4.97-point difference between the settings. Rubric 2.4 counts trade reputation the way 2.3 counts trades: each pair's points count for the share of the pair's traded value that moved net (its net share, from the ledger). The rest is the agent's **circular reputation**, summed over its partners as the points the pair paid it × (1 − net share). The index takes it off the reputation the social dimension scores and, at 2 a point, off the wealth economy and competitiveness score, the wealth rank competitiveness takes and the `prospered` and `earned_reputation` achievements. Five swaps of the same food pay 5 points and all 5 come off; five trades of wood for food pay 5 and none does. The in-world leaderboard is unchanged: it still pays every point, so a seat still has a reason to try, and the scorecard's `rank` is still the leaderboard's. The scorecard says what came off: the economy and social details name the wealth and reputation counted and the amount taken away, a weakness names the partners, and competitiveness gives the leaderboard rank when the two ranks differ. The ledger records, per partner, the points that pair's trades paid (`rep`), by replaying the engine's rule over the log (see *Circular reputation* under *Recomputing a score yourself*). A ledger stamped before 2.4 shipped has no `rep`. A pair whose goods all moved one way counts none of its points as circular either way; for a pair that traded goods back, scoring under 2.4, every surface derives `rep` again from the match's events, and where the events are gone it is estimated from the trade counts, at most 5 a partner and 20 in all, and the scorecard says so. Studies count it as a behavior. Each seat's `behavior` carries `circular_trades`, its completed trades weighed the same way (6 swaps count 6, six trades that move goods one way count 0), and `circular_reputation`, the points behind them, and `circular_trades_per_100_rounds` is an outcome a study can declare. It has no better side: it asks how often a model takes a loophole the rules state. `circular_reputation` reads null where a pair traded goods back and no ledger recorded that pair's points: on a match archived before 2.4 shipped and read under 2.3, as the 6 November studies' trials with such a pair are, and on one whose events are gone. `circular_trades` reads the older ledger too. What 2.4 does not see: - **The pair's whole match nets at once.** As for trade credit, one large exchange of different goods beside a run of swaps moves most of the pair's value, and most of the swaps' points still count. - **What moved, never why.** Two agents that trade wood for food and later, short of wood, trade it back count the same as two that planned the swap. In one single run of 16 October 2026 (m_1c052249b91e) one trade of wood for food ran opposite to the 7 that followed: net share 0.765, so 1.18 of each seat's points count as circular and each loses about 2 on the Index. A house bot that trades both ways counts like any seat. - **One pair at a time.** Goods that come back by another route keep their points. Three agents passing wood for food around a ring keep all 10 points each, five that each trade with the other four keep all 20, and goods returned through a third agent, by trade or gift, never net against the trades they undo (a gift straight back to the same partner does). `ring_share`, an outcome a study can declare, counts the seats in a closed ring tied by at least 10 of value each way, with no house bot among them, so a ring that farms its points one wood or food a trade (5 of value each way) escapes it too. The 112 matches of the 6 November studies held no ring of paid trades at any value, house bots counted. - **Goods that move one way.** A trade made for its point that moves goods one way keeps its pay, as under 2.3. - **Kept bonds.** Keeping a bond pays 2 points, for at most 3 bonds with one partner and 10 points in a match, and 2.4 leaves it alone, including a bond kept by a delivery inside a trade whose goods are then gifted back. The 6 November studies kept 2 bonds in all. - **Caps can hide it.** A seat whose social score sits at its cap before penalties, or whose wealth dwarfs the points, loses little or nothing: in the showcase match m_aa6f85fab659 a seat with 7.6 circular points keeps its 94.0. Each point costs from 0 to about 1.7 on the Index, more where a rank changes. Of the 40 newest public matches on 7 November 2026, 5 held circular reputation and the Index moved in 4, by at most 5.3. A study's trials keep the rubric their harness described (see *Which version you get* above), so the two studies of 6 November 2026 stay on 2.3. Rescored under 2.4 from their public records, the 8-pair study's difference falls from +4.97 (95% interval 1.94 to 8.00) to +3.24 (−2.26 to 8.74), 6 of its 8 pairs still positive. The swaps take 2.03 off it. The other 0.31 runs the other way: in one pair of matches, one seat at each setting made five one-for-one trades with a house bot. The lower-setting one later took some of its goods back, so 2.4 counts 2.9 of its 5 points as circular (its Index falls from 79.2 to 74.3); the higher-setting one traded one way only and keeps all 5. The other study, one model at three settings over 32 pairs, has two differences, and they go from +9.72 to +9.38 and from −5.66 to −5.68. Its 32 pairs replayed 8 maps four times each, so its 97.5% intervals counted once per pair (6.77 to 11.99, and −7.42 to −3.93) hold for those maps; counted once per map (cluster-robust, on 7 degrees of freedom), which is what carries to other maps drawn the same way, they are 5.65 to 13.11 and −8.11 to −3.24. The first difference is above zero on 28 of the 32 pairs and all 8 maps, the second on 2 of the 32 pairs and none of the maps.