Illegal advancement of the puck is called if the puck is moved with anything other than the legal playing section of the stick. The most frequent occurrence of this foul is advancing the puck with the glove (known as "gloving"), but includes any advancement of the puck using the free hand or any other part of the body. Incidental contact between the puck and glove will not be called as a foul unless the contact is deliberately used to advance the puck.
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This should be called if a player gains an advantage by advancing the puck with anything other than their stick. The signal to call this foul is done by punching one fist into the palm of the other hand.
Illegal advancement should not be called if there is incidental contact between the puck and the glove that does not give the player any significant advantage. This is true for incidental contact between any body part or piece of gear.
In this example black team player #1 hits the puck with his glove, illegally advancing it. Notice how he realizes this quickly and flips his stick to avoid hitting the puck with his glove again.
In this example, black player #40 pins the puck against the wall. The white player tries to push it forward, but can't because the black player's glove is stopping any movement along the wall.
ILLEGAL ADVANCEMENT OF THE PUCK