Type: Decimal

Contains the size of the bet inserted by the user from the Back betting frame.
The Back betting frame is available to the user only if the xml property "show_input_back" of the strategy tag is equal to "y". The Back betting frame is opened when the user clicks on a cell of the "Back" column.

<place condition="@is_horse_selected=1" price="@input_back_price" size="@input_back_size" />
When the horse is checked, place a bet with the inserted size and price.