From Pinnacle:
The following rules apply to standard teasers:
A tie in a standard teaser of three or more teams reduces the teaser to the next lowest number; for example, a four teamer with a tie becomes a three teamer.
Except for Arena Football, a tie in a two-team teaser, regardless of whether the other team wins or loses, is graded "No Action", and all monies are refunded.
Any teaser with an open spot and a loser is graded immediately as a loser; open teasers with a loss cannot be filled in.
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