Polo Rules

The LHBPA rules on body contact:

11.2. – Body contact.
11.2.1 – Shoulder–to–shoulder contact and the use of static elbows is allowed (you may "shield" yourself from others to avoid your bikes becoming tangled together, etc).
11.2.2 – Holding (with hands, elbows, or mallets) is not allowed (for example: "chicken winging", grabbing shirts, etc).
11.2.3 – Pushing with the hands is not allowed (for example: hands on a player's back, pushing a player away from you when being screened, etc).
11.2.4 – Mallet–to–body contact is not allowed (for example: hitting a player with your mallet, hooking a player's hand, etc).
11.2.5 – Body–to–bike contact is not allowed (for example: holding part of another player's bike, leaning
across a players cockpit, etc).
11.2.6 – Body pressing is allowed. (for example: pressing and leaning like–for–like between aware players is
fine, flying in unawares and taking someone off their bike is not ok).
11.2.7 – Pushing or checking someone from behind is not allowed.
11.2.8 – Physical blows about the neck or head, any punching or kicking are not allowed.
Personally, I think the 'static' elbow is probably a slightly confusing wording. Most players will either push their steering elbow out slightly, which is ok, or lift their mallet elbow to somewhere near shoulder height whilst in contact, which is definitely not, IMO.

In my view, elbows have no business being up at all, as most people's instinct, once the elbow is up, is to start pushing at the other player with the fore-arm or elbow in the back or side, which isn't really ok, even if it's not specifically prohibited, or even clothes-lining the chest, ie extending the fore-arm right across the upper torso, which is really poor form.

Much better to keep elbows down, but pushed out slightly, much as a sprinter does, so that your bars are protected, but you're not applying pressure to the other player.

This is another area where the rules could be more explicit, as I think some players may think that it's ok to push with fore-arm / elbow, just because they're not using a hand. Much better to just say elbows have to stay down well below shoulder-height, unless you're striking at the ball (which is what I have been saying to players anyway).