Line of the ball
The extended track the ball is travelling on. Almost every foul in polo is defined in relation to it.
The line of the ball is the extended path the ball has travelled or is travelling on. It counts just the same when the ball came off a pony, off a player, off the umpire's pony or off anything else on the field, so a deflection makes a new line at once. Miss the ball at a free hit and the line becomes the direction you were riding. The line is what decides precedence between players, and the rule
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Every rule here is stated in our own words, with short quoted extracts from the HPA Blue Book 2026 and Green Book 2025 and a link to the book itself. Polo Rules Test is an independent study aid and is not affiliated with the Hurlingham Polo Association. In any dispute the published rulebook governs.