A330
Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Time Pressure
Deviation / Discrepancy - Procedural Published Material / Policy
Human Factors
While taxiing in the ramp area approaching [the gate] I noticed the visual docking system was turned off. There were 2 wing walkers and a marshaller though so I continued in to park. About 40 feet short I felt there was inadequate clearance with the jet way. I stopped the aircraft; set the parking brake; and directed the passengers to remain seated. The marshaller then gave me the stop signal and motioned that the jet way was to be moved. After the jet bridge was properly positioned there was a short delay before the ground crew called on interphone. Apparently; someone had prematurely placed a chock on the nose wheel and it was now stuck there. I was told to release the parking brake to allow the aircraft to roll back; freeing the stuck chock. When I released the brake nothing moved. To assist I momentarily placed the thrust levers to idle reverse. Again nothing moved. I repositioned the thrust levers to forward idle and reset the parking brake.Coordination with the ground crew resulted in the engines being shut down and a tug moving the aircraft back so the chock could be removed; then forward to the parking spot. Subsequent parking and securing procedures were conducted uneventfully. Because [the flight] was operating late I became overly focused on getting to the gate as soon as possible. In this effort I momentarily activated the thrust reversers; which constituted an unauthorized power back operation. I failed to maintain a primary emphasis on safety- I realize there was a very real chance of foreign object damage or; most critically; personal injury.  I was inattentive to the safety concerns and Operating Manual restrictions associated with a power back operation. I placed too much focus on arriving as close to schedule as possible.
A330 Captain reported after a stop short of the gate a chock was stuck. Captain reported using idle reverse to attempt to free chock; in violation of policy.