Board and rules
Over-the-board procedures
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Touch-move rule
Level: BeginnerAn in-person rule requiring a deliberately touched piece to be moved or captured when a legal option exists.
j'adoube
Level: BeginnerA phrase spoken before touching a piece to show that it will only be adjusted within its square.
One-hand rule
Level: BasicThe requirement to execute each move with one hand and press the clock with that same hand.
Two-handed move
Level: IntermediateThe physical execution of one move with both hands, contrary to the competitive one-hand requirement.
Made move
Level: IntermediateA move whose physical execution has become fixed under the rules, before any separate completion by the clock.
Completed move
Level: IntermediateA move that has reached its final rules state, usually after the board move is made and the clock is pressed.
Irregularity
Level: IntermediateA competition situation that departs from the correct state or procedure and requires a rules response.
Displaced piece
Level: BasicA piece accidentally moved away from its correct place without necessarily constituting a chess move.
Illegal-move penalty
Level: IntermediateThe rules consequence applied when a player completes a move that does not meet the legal requirements.
Position reinstatement
Level: AdvancedThe procedure for reconstructing an earlier position and resuming the game from it after an irregularity.
Reversed colors
Level: IntermediateAn irregularity in which the players begin with the opposite colors from those assigned to them.