| (subclass GamePiece GameArtifact) | Mid-level-ontology.kif 17000-17000 | Game piece is a subclass of game artifact |
| (subclass RugbyBall GamePiece) | Sports.kif 324-324 | Rugby ball is a subclass of game piece |
| (subclass Football GamePiece) | Sports.kif 344-344 | Foot ball is a subclass of game piece |
| (subclass GameDie GamePiece) | Mid-level-ontology.kif 17004-17004 | Game die is a subclass of game piece |
| (subclass Ball GamePiece) | Mid-level-ontology.kif 17008-17008 | Ball is a subclass of game piece |
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