ASGA Tournament Chairman Bob Remey has issued the following position statement on the use of anchored putters: "ASGA will conform to USGA Rule 14-1B that prohibits strokes using a putter anchored to the players body".
For the rule definition go to USGA Rule 14-1B on the USGA website. Examples of permitted and prohibited strokes are available at this link.
Questions may be directed to Tournament Chairman Bob Remey.