Is “Countback” a Scrabble word?
Yes
COUNTBACK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Countback
noun
1.A procedure used to determine which of two equal finishers is the winner, based on past performance