Put this at the top of a variable-height playfield.
Usually, you'll have a
{{pfstart}}
one or more {{pfrow}} lines
{{pfend}}
Example
{{pfstart}}
{{pfrow| | |J|J|J| | | | | }}
{{pfrow| | | | |J| | | | | }}
{{pfrow| | | | | | | | | | }}
{{pfrow| | | | | | | | | | }}
{{pfrow| | | | | | | | | | }}
{{pfrow|J| |-|-|-| | | |i| }}
{{pfrow|J|J|J|Z|-|S|L|L|i| }}
{{pfrow|O|O|Z|Z|T|S|S|L|i| }}
{{pfrow|O|O|Z|T|T|T|S|L|i| }}
{{pfrow|G|G|G| |G|G|G|G|G|G}}
{{pfrow|G|G|G| |G|G|G|G|G|G}}
{{pfend}}
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Output
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It is possible to show one preview by putting the next piece all alone in a 2-row-high playfield above the main playfield.
