I have a question about the trickery rule; there was a throw in to myself. My first touch i chested it up to a header back to the goalie where he picked it up with his hands. The opposite team was awarded a free kick at spot. I was told if i didnt chest it and just hit with my head it would of beeen fine just want to double check his call thanx

USSF answer (September 28, 2011):
The International Football Association Board (IFAB) changed Law 12 in 1992 in an effort to deal with trickery aimed at circumventing the requirement limiting the opportunities for the goalkeeper to handle the ball when it was deliberately kicked to him by a teammate. (Previously it had been legal for the goalkeeper to pick up the ball with his hands if the teammate had been outside the penalty area when he kicked the ball to the goalkeeper.) Players looked for and found crafty ways to get around the requirement and thus the IFAB adopted a new Decision 18 to Law 12 in 1993 (since incorporated into Decision 3 to Law 12). This Decision 18 specifically defined trickery as including (but not limited to) the teammate “using his head or chest or knee, etc.” That is now found in the Interpretation of the Laws of the Game and Guidelines for Referees under Cautions for unsporting behavior: “uses a deliberate trick while the ball is in play to pass the ball to his own goalkeeper with his head, chest, knee, etc. in order to circumvent the Law, irrespective of whether the goalkeeper touches the ball with his hands or not. The offense is committed by the player in attempting to circumvent both the letter and the spirit of law 12 and play is restarted with an indirect free kick”

One clue to the correctness of the player’s action is whether it a natural part of play or is clearly artificial and intended only to circumvent the Law. In such cases, the action is considered misconduct whether it ultimately is touched by the goalkeeper or not. Indeed, the misconduct should be whistled before the goalkeeper even has a chance to touch it.

The defender who initiates the “trickery” is cautioned and shown the yellow card for unsporting behavior; the decision does not require that the goalkeeper actually handles the ball, and the misconduct can occur during dynamic play or at a restart. The question as to which defender in this case was guilty of initiating the deliberate trickery can be answered only by the referee who is on the spot. The referee must be sure that the sequence of play was indeed intended to circumvent the Law and to prevent opponents from having a fair chance to compete for the ball rather than have it unfairly handled by the goalkeeper. If, in the referee’s opinion, there was trickery, then it is the teammate who played the ball immediately prior to it going to the goalkeeper who would be cautioned.

The key to deciding whether or not a player is trying to thwart the Law by passing the ball to the goalkeeper without actually kicking it is whether the action is a natural one, a normal playing tactic, which is perfectly legitimate, or a contrived act, a “trick,” which must be punished with a caution for unsporting behavior.

You will also find the answer in the USSF publication “Advice to Referees on the Laws of the Game.” It requires that the referee exercise a good sense of the game.

A goalkeeper infringes Law 12 by touching the ball with the hands after receiving it directly from a throw-in taken by a teammate. The goalkeeper is considered to have received the ball directly by playing it in any way (for example, by dribbling the ball with the feet) before touching it with the hands. Referees should take care not to consider as trickery any sequence of play that offers a fair chance for opponents to challenge for the ball before it is handled by the goalkeeper from a throw-in.