Useful code for calculate bet size

bet.scala

def kellyFactor(pWin: Double, odd: Double) = {
  (pWin * odd - 1) / (odd - 1)
}

def betSize(
  bankroll: Double, 
  minOdd: Double, 
  odd: Double) = {
    val pWin = 1.02 / minOdd
    val kf = kellyFactor(pWin, odd)
    val left = (0.75 / 100 + kf * (odd / minOdd - 1)) / (odd - 1)
    val right = 2d / 100 / (odd - 1)
    // println(s"$left <> $right")
    val size = math.min(left, right)
    bankroll * size
  }

Seq(3d -> 9.2, 3.1 -> 11d, 3.2 -> 14d, 3.3 -> 17d, 3.4 -> 20d).map {
  case (odd, bet) => 
    val newBet = betSize(2500d, 2.979, odd)
    println(newBet -> bet)
}