Single pony for arena polo?

[Vindicated]

In regards to arena polo, are there actually any rules that stipulate that a pony change must occur between chukkas?
I understand the need for the professionals to change pony every chukka as they're galloping up and down a 300 yard field for 7 minutes, but surely a fit thoroughbred could play consecutive chukkas in arena polo, especially low goal where the pace is normally always at a slow canter.

Thanks

 

[Leaf]

no you are not allowed to play one pony for four chukkas regardless how slowly you go! you need to hire a second pony. check the HPA for the definitive ruling but no pony is allowed to play more than 2 chukkas or the combined time.