Here are the rules for the 2010 event. I see restricted step (two 60-second rounds) and moving step (one 90-second round) as well as chi sau, but no "freestyle" push-hands event (at least in this version). There are also shuai jiao and sanshou (sanda) competitions (see full set of rules).
GENERAL OUTLINE OF COMPETITION RULES
Restricted-Step Push Hands - two 60 sec rounds with a 15 sec break in between rounds
Moving Push Hands - one round of 90 sec PUSHING TIME
Shuai Chiao - three 2 min rounds with a 1 min rest period in between rounds
Chi Sau - two 90 sec rounds, with a 30 sec rest period in between rounds
San Shou - three 2 min rounds, with a 1 min rest period in between rounds
Reaction Skill events include Stationary Push Hands, Moving Push Hands, Shuai Chiao, Chi Sau, Weapons Sparring, & San Shou. Nearly all reaction events have listed some sort of protective gear, some mandatory, some optional. All competitors are responsible for their own protective equipment unless otherwise mentioned.
RESTRICTED-STEP PUSH HANDS
All push hands competitors must wear short-sleeved shirts. One match consists of two 60 second rounds with a 15 second break in between rounds. Opponents face each other and each places their foot on the center mark. When prepared to begin, they make contact with the back of the right or left wrist. The referee gives the command to begin at which time the competitors are required to perform a minimum of 2 revolutions before initiating any techniques. Time is suspended while the referee calls for a point and verification and announces their decision and for consultation or emergency situations. Points are awarded to the competitor whose opponent has made an error or committed a personal violation or a serious personal violation. Points may be awarded for technical violations.
Attacks may be made within restricted areas of the body: from below the base of the neck to above the coccyx or bladder area. Pushing the neck, head, bladder area, hip joint, or leg is illegal.
Competitors may take a step or steps forward or backward, with either the front or the back foot, but may not reverse the stance, i.e., the front foot must stay forward. Competitors must keep to the orientation of the center line; they may not step to the side to defend or to gain an advantage in pushing.
Points are awarded to the opponent of the competitor who committed the violation. However, the opponent will receive 2 pts if one commits a serious personal violation. Disqualification may be enforced for one serious violation and must be disqualified for 2 serious violations. The referee in consultation with the judges may disqualify a competitor.
Loss of balance and endangering oneself.
Serious Personal Violations
1. Using techniques excessive in strength
1. Striking, hitting, punching
2. Grabbing the opponent's clothes
2. Using the head to attack
3. Double grabbing (gripping with both hands)
3. Using the legs, knees, or feet to attack
4. Holding on to prevent loss of balance.
4. Twisting the joints (grappling or chin na)
5. Attacking an illegal target area
5. Using pressure points
6. Reversing the stance to gain advantage
6. Pulling hair or beard
7. Attacking the groin area
8. Using any technique determined to cause injury
1. Not following instructions of the referee 9. Unsportsmanlike conduct
2. Not completing the mandatory revolutions
3. Receiving coaching during the round
Points are awarded to the opponent of the competitor who committed the violation. However, the opponent will receive 2 points if one commits a serious personal violation as listed above.
Competitors may be disqualified for one serious violation and must be disqualified for 2 serious violations. A competitor may also be disqualified by the referee in consultation with the judges.
The Chi Sau matches will consist of three rounds, the first two being 45 seconds and the third being 60 seconds (intermediate division) or 120 seconds (advanced division); with a 30 second rest period in between rounds. No long-sleeved shirts or short pants will be permitted. Competitors will not be allowed to wear any objects (including jewelry) that may cause injury to themselves or to their opponents. Fingernails must be clipped as short as possible, and will be inspected by the officials. A mouthpiece and groin protector will be required. Head gear is mandatory in the third round for advanced divisions; hand and foot gear will not be required. The competition area will be a square space measuring 9' x 9', enclosed and divided into two halves by tape.
Judges will be looking for a continuous exchange of discernible techniques, with an emphasis on adherence or "sticking". This is to be distinguished from wrestling, shoving, and boxing. In the first two rounds, techniques must be directed to the chest region with at least one hand in contact with the opponent's arm. In the third round, techniques are allowed to be aimed at the head with (intermediate) no contact or (advanced) light-contact. Competitors should display good "bridging" skills. Points are awarded for proper, legal technical contact. Points will be deducted from a competitor that makes an error or commits a personal violation.