What is a Yankee bet?
A Yankee is 11 bets across 4 selections: 6 doubles, 4 trebles and 1 four-fold. Unlike a Lucky 15 it has no singles, so at least two of your four selections must win for any return — but the combinations still pay even if not all four land.
Example
4 selections at £1 per line = £11. Two winners pay the relevant double; three pay the doubles and treble; all four pay every line.