Play and stop messages are now of the form:
(PLAY|STOP <MATCHID> <TURN> <YOURLASTMOVE> <PERCEPTS>), where <TURN> is an integer counting the number of turns played (=0 on the first play message), <YOURLASTMOVE> is the last move of the player receiving the message or "nil" for the first play message, and <PERCEPTS> is the list of terms "seen" by the player according to the sees predicate or "nil" on the first play message.
Note: These changes are only for GDL-II players. Complete information players (GDL V1) are not affected.