Touching Pieces During Your Move
The basic rule governing the touching of chess pieces is that if you touch one or more of your chess pieces, you must make a move with the first piece you touch. The exception is if a player announces first that he is only adjusting the piece on the chess board. This declaration must be made before touching any chess piece. If the piece touched cannot legally be moved, then you may make any legal chess move.
Touching Pieces During a Castle
In the castle move, the first piece touched is the piece that must be moved first. In other words, if you touch the rook first, you must move the the rook first. If you touch the king first, you must move the king first. Once the first piece is released, then the castle must be completed. If both pieces are touched at the same time, and a castle is not allowed, then you must determine if you can make a legal move with the king before being open to any other move.
Touching the Chess Piece of an Opponent
If you touch an opposing player's piece, you must take the piece in a legal move. If you touch both your own piece and one of your opponent, you must move his piece if it was touched first, or take the piece of you opponent if it was touched first. If you touched both pieces at the same time, it is up to your discretion which course of action to take. If neither piece may be moved legally or taken, then you may make any legal move.
Releasing Your Chess Piece
Once you've moved a chess piece to a new space on the board and then released it, you can't move it to another space on the board during that move. As long as you hold the piece, you can change its destination.
Violations of the Rule
If an opponent witnesses a touching violation during tournament play, he should stop the game clock and consult an official. If there are no witnesses, the opponent may not be able to substantiate the charge. It is the final judgment of the official how to proceed. All players should adhere to the rules in order to uphold their own integrity, as well as the integrity of the game.