knight
Enable an AI agent to recognise a knight chess piece, record its physical and game state, and determine its permitted use under the applicable chess rules.
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.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an AI agent to recognise a knight chess piece, record its physical and game state, and determine its permitted use under the applicable chess rules.
In the physical-object sense used here, a knight is a chess piece, conventionally represented by a horse's head, that moves to a square two files and one rank, or one file and two ranks, away, without being blocked by intervening pieces.
It can be Identify the token as a knight and establish its side using the set convention or an explicit assignment.; Enumerate knight destinations and attacked squares from a supplied board position.; Filter candidate moves against occupancy, turn and king-safety constraints.; Move the token to a legal destination and remove an opposing captured piece when authorised.; Assign an available knight token to represent a pawn promoted to a knight.; Flag ambiguous markings, damage or poor board fit before physical play or automated handling..
Distinguishing features
Its assigned chess role permits displacement by two files and one rank, or one file and two ranks, in standard chess.
Intervening occupied squares do not obstruct its movement, unlike the paths of bishops, rooks and queens.
Every standard knight move changes the colour of the occupied square.
A horse-head form commonly signals a knight, but an explicit role assignment or set convention is needed when appearance is ambiguous.
The covered entity is a chess token; a human title or mounted warrior belongs to a different sense of knight.
Scope
+ Identification of a physical piece assigned the knight role
+ Side affiliation, current square and participation state
+ Knight movement, capture and attack patterns in standard chess
+ Constraints that distinguish a geometric knight move from a legal move
+ Physical distinguishability and suitability for the intended board
- Knighthood as a social rank, honour or historical military role
- Whole-game administration, clocks, scoring and competition procedures
- Complete board positions and rules governing other chess-piece kinds
- Horse sculptures or decorative objects with no assigned chess role
- Digital rendering, chess-engine implementation and general search algorithms
Characteristics
- Represented piece role
- knight; uncertain pending identification Assigned role determines movement; silhouette alone may not establish it.
- Applicable ruleset
- Reference to standard chess or a named variant and its rules Variant rules may change movement, capture or role assignment.
- Side affiliation
- White; Black; unassigned; variant-specific side Determines friendly occupancy, opposing pieces and control.
- Current square
- Board-square reference; a1-h8 on a standard board; none when off board Locates the origin from which destinations and attacks are evaluated.
- Participation state
- in play; captured; spare; awaiting placement; unknown A captured or spare token contributes no attacks to the current position.
- Standard movement offsets
- (file offset, rank offset): (±1, ±2) or (±2, ±1) Defines the knight's geometric destinations before board and legality constraints.
- Role acquisition
- initial setup; pawn promotion; explicit setup assignment; unknown Distinguishes game-role history from the identity of the physical token.
- Role and side legibility
- unambiguous; ambiguous role; ambiguous side; both ambiguous An agent must reliably distinguish this knight from other pieces before moving it.
- Physical envelope
- Height and maximum horizontal dimensions in mm Supports square fit, storage fit and collision-aware handling of projecting horse-head forms.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.knight
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 17 findings · 25 questions.
Knight identity and sense Establishes that the registered thing is the chess-piece sense and identifies the token's represented role.
The batch contains multiple senses of knight, and a horse-shaped object does not by itself establish a chess role.
Registry sense
Resolves the intended meaning while preserving registry granularity.
Chess sense boundary
The draft interprets this entry as the physical knight chess piece, subject to confirmation from the registry's source record.
- Does the source record for vr.tr.knight-q136 explicitly identify the chess-piece sense? provenance
- Which separate registry entry owns knight as a human rank or role? boundary
Token role recognition
Connects a physical token to its knight role and side.
Assigned role and appearance
Horse-head styling is a common recognition cue; themed, tactile or substitute pieces require the relevant set convention or explicit assignment.
- Which shape, marking, tactile feature or declared convention identifies this token as a knight? definition
- What evidence establishes its side when the set does not use literal white and black colours? provenance
Knight movement and attacks Captures the knight's distinctive displacement and its interaction with occupied squares.
Recognition alone is insufficient: an agent must distinguish jumping movement, attacks and permitted captures.
Jump geometry
Defines destination offsets independently of intervening pieces.
Two-and-one displacement
In standard chess, a knight changes one coordinate by two squares and the other by one; intermediate occupancy does not block the move.
- Which destinations at offsets (±1, ±2) and (±2, ±1) lie within the current board? measurement
- Does the applicable variant preserve the standard knight jump? boundary
Destination interactions
Distinguishes geometric attacks from movement onto occupied squares.
Occupancy and capture
A knight may move to an empty destination or capture an opposing non-king piece there; friendly occupancy prevents a move onto that square.
- For each geometric destination, is the square empty, friendly-occupied or opponent-occupied? measurement
- Does the requested operation concern an attacked square, a defended friendly piece, a capture or a quiet move? action
Knight game state and legality Connects the knight to the supplied game position and its history of role assignment.
A geometrically valid jump may be illegal, and promotion can introduce knights beyond the initial pair.
Position-dependent legality
Uses external board state to evaluate turn and king safety.
Legal move versus attack
A standard-chess knight move must respect the turn and leave its own king safe; attack evaluation remains distinct from whether the knight can legally move.
- Would the candidate knight move leave or place its own king in check? action
- When evaluating an attacked square, has the agent avoided treating a king-safety restriction on movement as removal of the knight's attack? definition
Role history and participation
Tracks whether the knight is active and how the represented role entered the position.
Initial, promoted and spare knights
A knight role can originate in initial setup or pawn promotion; physical tokens may also remain captured or unused off board.
- Was this active knight introduced by initial setup, promotion or an explicitly constructed position? provenance
- If a spare or substitute token represents a promoted knight, how is that assignment made unambiguous? action
Physical knight use Addresses recognisability and handling of a physical knight on its intended chessboard.
The PHY entry must support actual token recognition and manipulation without confusing physical travel with abstract jumping rules.
Knight form and board fit
Assesses whether the distinctive piece form remains identifiable and fits the play surface.
Recognisable, stable placement
The token must remain distinguishable as a knight and occupy its intended square without ambiguous placement; projecting forms can affect clearance.
- Do the base and projecting head fit the intended square without interfering with neighbouring pieces? measurement
- Has wear or damage obscured the features that distinguish this knight from other roles or sides? measurement
Physical jump execution
Translates an authorised knight move into a physical transfer.
Transfer clearance and orientation
The rule allowing a knight to jump does not provide physical clearance; handling must avoid other tokens, and facing direction does not change standard knight movement.
- What lift height and transfer route clear intervening pieces for the selected knight and handling device? measurement
- Can the agent place the knight securely on its destination, removing any authorised captured token without disturbing neighbouring pieces? 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.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The chess-piece sense is inferred from PHY.OBJ and the duplicate-name warning; the registry's underlying entry should confirm it.
- This is recalled knowledge, not source-checked research.
- Exact tournament equipment dimensions and applicable FIDE document editions should be checked before specifying a physical set.
- Which of these check these first hold for the sense of knight this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- White knight
- Black knight
- Which of these kinds and varieties hold for the sense of knight this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- English algebraic chess notation - N - Identifies the piece type in move notation, not an individual physical piece.
- Unicode - U+2658; U+265E - WHITE CHESS KNIGHT and BLACK CHESS KNIGHT, respectively.
- Which of these identifiers and schemes hold for the sense of knight this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- FIDE Laws of Chess, issued by the International Chess Federation, define the knight's movement and the rules governing legal moves.
- FIDE chess equipment standards specify requirements for tournament pieces, including recognisability and proportions.
- Which of these standards and regulation hold for the sense of knight this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Playing over-the-board chess.
- Teaching tactics, particularly forks and attacks on squares of alternating colours.
- Representing positions in chess analysis and composed problems.
- Which of these real-world use hold for the sense of knight this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Knights per player in the standard starting position - 2 - pieces
- Geometrically reachable destination squares from one square - 2-8 - squares - Depends on board location; occupancy and king safety can further restrict legal moves.
- Which of these typical measurements hold for the sense of knight this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- A broken or ambiguous piece design can cause misidentification.
- A missing knight prevents use of the standard starting set unless a replacement is supplied.
- Small detachable pieces can present a choking hazard to young children.
- Which of these failure modes and hazards hold for the sense of knight this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Algebraic notation uses different piece letters in different languages; N is the English convention.
- The horse in xiangqi has a related movement pattern but can be blocked by an intervening piece; it is a distinct game piece.
- Which of these regional variation hold for the sense of knight this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- knight as a social or military role - A person holding a title or historical military status, rather than a chess piece.
- bishop - Moves along unobstructed diagonals rather than making the knight's fixed jumping move.
- rook - Moves along unobstructed ranks or files rather than making the knight's fixed jumping move.
- chess piece - The broader category; a knight is one specific piece type.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of knight this model covers, and on what evidence? provenance
What the second pass must settle
- Confirm from the registry source that vr.tr.knight-q136 denotes the chess piece, and identify the entry covering the other knight sense.
- Determine whether an existing Vercy chess-piece or knight world model already owns this concept and should be linked instead of duplicated.
- Read the governing chess rules to establish authoritative references for movement, attack semantics, king safety and promotion.
- Settle whether this entry covers only standard chess knights or also variant knights whose rules require explicit qualification.
- Determine which physical-piece conventions or competition requirements apply to the intended sets, including tactile identification and acceptable promotion substitutes.