The Handicap Draw is slightly more complicated. Here, you're betting on the underdogs to lose by the exact goals margin spelled out in the Handicap Draw odds. In this example, Handicap Draw +1 means Latvia need to lose by exactly a goal for the handicap to apply its +1 and result in a draw.

Where there is a half number (0.5, 1.5, 2.5, etc.), a draw is impossible. Where there is a whole number handicap (0, 1, 2, 3, etc.), the draw is possible. Stakes will be returned when a handicap draw happens (the final result of the match is drawn after including the whole number handicaps).

Definition of 'I bet/I'll bet'\n\n You use I bet or I'll bet in reply to a statement to show that you agree with it or that you expected it to be true, usually when you are annoyed or amused by it. [informal, spoken, feelings]

The phrase I/ I'll bet you do,  means I really believe you, so much that I'm willing to make a bet on it.  The scenario in which it's stated, however, is what actually determines the meaning.