Working with thatch is a great way to see how round-off can affect play. Failures result in a small loss of material.
Combined mixed grass of greater than .05 will only use the required .05 per thatch created, so loss only occurs upon failure.
The maximum thatch [[QL | quality]] is the quality of the mixed grass used, with exception of using a [[rare]] or greater leggat, which increases the maximum quality that is possible.