A Union Jack bet is named after the pattern made on the betting slip. There are 9 selections in a 3×3 grid. A winning bet involves having a treble along any of the straight lines. Three horizontal, three vertical and two diagonals. In total there are 8 trebles.
The 8 winning combinations are:
8 trebles: 1-2-3, 4-5-6, 7-8-9, 1-4-7, 2-5-8, 3-6-9, 1-5-9, 3-5-7
It is possible to have six winning selections but receive no return.
Union Jack Treble Bet Calculator