or of an approved synthetic material.

The green is surrounded by a ditch between 200 millimetres and 380 millimetres wide, and between 50 millimetres and 200 millimetres deep. The ditch has a bank against its outer edge. The top of the bank should be at least 230 millimetres above the surface level of the green.

Generally, greens are built in a square shape as close to 40 metres as possible. This allows for games to be played in either direction. The advantages of playing in different directions are that: the wear on the green

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