king
Enable an AI agent to recognise a physical chess king, establish its role and current state, and determine which handling or game actions are permissible.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a physical chess king, establish its role and current state, and determine which handling or game actions are permissible.
A monarch occupying the highest hereditary office of a kingdom, typically male, whose authority, succession, and public role are defined by that polity's constitution, statute, or customary law rather than by personal title alone.
It can be Identify the king and associate it with the correct side and game.; Reconcile its observed location with the confirmed game position.; Evaluate candidate king moves using the complete resulting position.; Evaluate and execute authorised castling as a coordinated king-and-rook action.; Flag check, uncertain castling rights or inconsistent placement for resolution.; Replace an unusable token while preserving the represented king's game history..
Distinguishing features
The set's design, documentation or explicit assignment identifies this token as the king; height or a cross-shaped finial alone is insufficient.
Under standard chess rules, its ordinary movement is to an adjacent square, subject to king-safety constraints, unlike the queen's long-range movement.
It is the piece whose checkmate ends the game; capturing it is not a legal game action.
It participates with a rook in castling when the applicable conditions hold. [FIDE Laws of Chess, Articles 1 and 3](https://handbook.fide.com/chapter/e012023)
Scope
+ Recognition of a king within its particular chess set
+ Assignment of the physical token to a side and game
+ Observed placement and reconciliation with the recorded position
+ King movement, exposure to attack and castling eligibility
+ Physical usability and replacement of the king token
- Human monarchs, royal offices and political authority
- Complete chess-game state, scoring and adjudication
- Board geometry, orientation and square recognition as standalone models
- Movement models for other chess pieces
- Player identity, clocks and tournament administration
- General manufacturing, ownership and valuation of chess sets
Characteristics
- King recognition evidence
- set documentation | distinctive design | explicit token assignment | unresolved Prevents a queen, decorative miniature or substitute token from being misidentified.
- Assigned side
- white side | black side | unassigned | unknown Determines friendly occupancy, opposing attacks and the relevant player.
- Game and ruleset
- linked game and explicit ruleset/version Supplies the context required to evaluate king actions.
- Observed placement
- identified square | between squares | held | off board | unknown Separates what a sensor sees from a confirmed game move.
- Confirmed game square
- a1-h8 for a standard board | unresolved | not assigned to a game Anchors movement and attack evaluation to the accepted position.
- Check assessment
- in check | not in check | unknown, linked to a position revision Constrains responses without treating stale analysis as current.
- Castling rights
- retained | lost | unknown, separately for each associated rook Records historical eligibility separately from immediate feasibility.
- King movement history
- never moved | moved | unknown, with supporting game history A current square alone cannot establish castling rights.
- Physical readiness
- recognisable and stable | ambiguous identity | unstable | damaged | missing Determines whether the king can be reliably observed and handled.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.king-2
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 20 findings · 33 questions.
King identity Establish which physical token represents the king and whose king it is.
King-specific restrictions must attach to an evidenced role, not an assumed silhouette.
Set-specific recognition
Distinguish the king from similar pieces in this set.
King identification evidence
Record the design cues or explicit designation supporting recognition, including ambiguity with the queen.
- What evidence identifies this token as the king in this particular set? definition
- Could the same visible features identify a queen or decorative object here? boundary
Side and token assignment
Connect the physical object to one represented king.
Represented king
Record side, game and whether the object is an original piece, spare or designated substitute.
- Which side and game is this king assigned to? definition
- Who or what established that assignment, particularly for a substitute token? provenance
King position Locate the king and reconcile observation with game state.
A misplaced or temporarily lifted king must not silently become a confirmed move.
Observed king location
Capture the physical placement and its uncertainty.
Square assignment
Record the observed square or off-board condition together with board orientation and observation time.
- Which square contains the king's base, and how was board orientation established? measurement
- Is the token centred on a square, straddling squares, being held or off board? measurement
Position reconciliation
Associate the observation with a confirmed position revision.
Observed versus recorded square
Record discrepancies and the evidence needed to distinguish a move from adjustment, setup or disturbance.
- Does the observed king location agree with the latest confirmed game position? boundary
- What evidence is required before accepting a discrepancy as a completed king move? action
King safety and movement Evaluate ordinary king moves and king exposure using the linked board position.
A geometrically reachable square can still be forbidden because of attack.
Ordinary king moves
Evaluate candidate destinations and resulting occupancy.
Candidate destination
Record destination geometry, occupancy and the resulting position used for safety evaluation.
- Is the proposed destination adjacent and available under the selected ruleset? boundary
- After moving the king and removing any captured piece, is the destination attacked? action
Check and response
Record attackers and refer whole-side response analysis to the game model.
Attack evidence
Attach attacking pieces and attack paths to a specific position; include opposing-king proximity and attacks from pinned pieces.
- Which opposing pieces attack the king's square under the applicable attack rules? measurement
- Does the attack calculation account for the opposing king and pieces constrained by their own king's safety? boundary
Response and outcome boundary
Keep king escape analysis separate from all legal responses and the game's outcome decision.
- Can the side answer the threat through a king move, capture or interposition? action
- Has the game model checked all legal moves before reporting checkmate or stalemate? boundary
Castling Track historical rights and evaluate a proposed coordinated king-and-rook move.
Castling requires information that cannot be recovered from the king's present location alone.
Castling history
Establish rights using the king and associated rook histories.
Historical rights evidence
Record evidence of retained or lost rights and preserve unknown status when history is incomplete.
- What move history or trusted position record establishes rights for each associated rook? provenance
- Has the king or relevant rook previously moved, even if it later returned? boundary
Castling feasibility
Evaluate current occupancy, king safety and both pieces' destinations.
Castling action plan
Record the ruleset-specific path checks and a coordinated relocation plan tied to the current position.
- Which king and rook start squares, transit squares and destinations apply to this ruleset? definition
- Do current occupancy and attack conditions permit this castling action? boundary
- How will both final placements be verified before the game record accepts castling? action
Physical king use Assess whether the king token can be handled and keep physical interventions distinct from game actions.
Damage, accidental displacement and replacement can affect the token without changing the represented king's rights.
King handling readiness
Assess king-specific recognition and manipulation constraints.
Finial, base and grip
Record whether damaged identifying features, an unstable base or a fragile top prevent reliable recognition or movement.
- Can this king still be distinguished from its queen and stand securely on one square? measurement
- Where can the token be gripped without relying on a fragile finial or disturbing neighbouring pieces? action
King intervention continuity
Preserve the represented king across adjustments, disturbances and token replacement.
Handling intent
Record whether manipulation is an authorised move, adjustment, restoration or replacement; avoid inferring resignation from a fallen king alone.
- What establishes the purpose and authority for touching, lifting or repositioning this king? action
- If the king is toppled or removed, what corroborating evidence establishes the game significance? boundary
Replacement continuity
Link a replacement token to the existing represented king and its confirmed state.
- Which replacement token has been accepted to represent this same king? provenance
- How will side, square and castling history be preserved through replacement? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- constitutional / ceremonial monarch
- absolute monarch
- elected or tanist king
- co-king or junior king
- king consort
- pretender or claimant in exile
- chess king (game piece)
- playing-card king
- Which of these kinds and varieties hold for the sense of king this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q12097 - king as male monarch / sovereign of a kingdom
- Wikidata - Q184386 - chess king (game piece); separate item from the office
- Library of Congress Subject Headings - Kings and rulers - LCSH class used in cataloguing persons holding the office
- Which of these identifiers and schemes hold for the sense of king this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Succession to the Crown Act 2013 (United Kingdom Parliament) - gender-neutral succession and consent to royal marriage in the UK and, by agreement, several Commonwealth realms
- Spanish Constitution of 1978, Title II The Crown (Cortes Generales / Kingdom of Spain) - king as Head of State, inviolable, with succession by male-preference cognatic primogeniture still in the text
- Belgian Constitution, Title III The King and the Federal Government (Belgian Federal Parliament) - king's powers exercised only with ministerial countersignature
- FIDE Laws of Chess, Articles 3.8 and 5 (International Chess Federation) - movement, check, and checkmate of the king piece
- Which of these standards and regulation hold for the sense of king this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Head of state in remaining kingdoms (e.g. United Kingdom, Spain, Belgium, Sweden, Norway, Denmark, Netherlands, Jordan, Morocco, Saudi Arabia, Thailand, Eswatini), performing constitutionally specified acts: assent, appointment of ministers, commander-in-chief functions, state visits
- Dynastic and liturgical figure in coronation, accession, and state funeral rites
- Named party on coinage, seals, letters patent, and military commissions
- Chess set piece: the unique royal piece whose checkmate ends the game
- Standard face card in a 52-card deck (king of each suit)
- Which of these real-world use hold for the sense of king this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- reign length - a few days to ~70 years in well-documented modern cases - year
- count of currently reigning kings as heads of state - on the order of 20-30 sovereign kings worldwide, depending on whether elective and dual monarchies are counted - person
- chess-king height in a tournament set (Staunton) - 85-105 - mm
- Which of these typical measurements hold for the sense of king this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Succession crisis: disputed legitimacy, minority, or absence of an heir producing civil war or constitutional deadlock
- Personal union and divided loyalty when one person is king of more than one realm
- Constitutional overreach or refusal to act (e.g. withholding assent, dismissing a government) in a system that assumes a non-partisan crown
- Regicide, deposition, or forced abdication as political violence against the office-holder
- In chess: leaving the king in check is an illegal move; stalemate and insufficient mating material are game-ending conditions distinct from checkmate
- Which of these failure modes and hazards hold for the sense of king this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- English king vs queen: gender of the sovereign; a reigning woman is queen regnant, not king
- French roi, Spanish rey, German König, Arabic malik, Hebrew melek, Chinese wang - not always equivalent in rank to European king (wang historically below huangdi/emperor)
- Saudi Arabia and several Gulf states: king as absolute or near-absolute ruler with Islamic legal framing; European kingdoms: largely ceremonial under ministerial responsibility
- Malaysia: Yang di-Pertuan Agong, a king elected on rotation among hereditary state rulers
- Eswatini: dual monarchy with a king (Ngwenyama) and a queen mother (Ndlovukati) sharing ritual and political roles
- Chess: the piece is called roi, König, rey, король; some historical sets used a non-Staunton form that is easy to confuse with the queen
- Which of these regional variation hold for the sense of king this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- queen regnant - A woman holding the same sovereign office in her own right; test is the incumbent's sex and the style used in that polity's law (queen, not king), not a lesser rank.
- emperor - A higher or differently framed imperial rank (imperator, huangdi, tennō); test is the polity's official style and whether the ruler claims supremacy over kings rather than kingship of a single kingdom.
- king consort - Spouse of a queen regnant who holds a kingly title without the sovereign office; test is whether succession and constitutional powers vest in that person.
- prince / crown prince - Heir or dynast who is not yet sovereign; test is whether accession (or an equivalent legal act) has occurred.
- chess queen - The most mobile piece, not the royal piece; test is movement (queen: any number of squares on rank, file, or diagonal; king: one square) and that only the king's checkmate ends the game.
- playing-card king - A rank in a card deck, not an office-holder; test is the object type (printed card vs person or chess piece).
- Which of these neighbouring kinds and how to tell them apart hold for the sense of king this model covers, and on what evidence? provenance
Sources
- king (Q12097) - Canonical identifier and class: male monarch of a kingdom; distinguished from queen, emperor, and other royal ranks.
- King - Specialist definition of king as sovereign of a kingdom and the historical range from sacral and absolute to constitutional forms.
- Succession to the Crown Act 2013 - Modern statutory regulation of who becomes king in a constitutional monarchy, including gender-neutral succession and marriage consent.
- Laws of Chess - The chess king as a distinct physical game object with unique movement, check, and checkmate rules, often confused with the monarch sense.
What the second pass must settle
- Does an existing Vercy world model already own the chess-king concept, requiring this registry entry to link to it?
- Should the initial model support only standard chess, or also Chess960 and other explicitly named variants?
- What evidence threshold should establish king identity in unfamiliar, abstract or accessibility-oriented chess sets?
- Which connected system supplies authoritative position history, attack analysis and castling rights when observations are incomplete?
- Which play context and handling rules govern robotic movement, adjustments, replacement tokens and interpretation of a toppled king?