Roulette Ruby

Assumptions:
- we get double our bet back when we win
- we reset the bet to 1 when we win
- we leave the bet at the maximum bet of $50 when we hit it
- we double our bet each time we lose (this is the theoretical lynch pin in that you can win back your previous losses eg. you lose with bets of 1,2,4,8. Then you win with a bet of 16. So total profit is 16 - 8 - 4 -2 -1 = 1. So you never really lose. Until you hit the table betting limit.)
- we keep betting until we run out of money or we make 1.05 * initial bank

This is the highest win ratio but the wins are so small that one loss wipes them out.

tohare@pts-tohare-laptop:~/projects/ruby$ ruby roulette.rb  
count: 368, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 190, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 233, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 1361, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 192, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 425, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 702, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 219, bank 2101, bank - INITIAL_BANK 101, bet 1
count: 15496, bank 44, bank - INITIAL_BANK -1956, bet 50
count: 1078, bank 2101, bank - INITIAL_BANK 101, bet 1
Times Won: 9
Times Lost: 1
Average win amount: -105
tot amount: -1047


class RouletteTable
  BLACk=[2,4,6,8,10,11,13,15,17,20,22,24,26,28,29,31,33,35]
  RED=[1,3,5,7,9,12,14,16,18,19,21,23,25,27,30,32,34,36]

  def self.spin
    srand()
    result = rand(37)
    #puts "Result: #{result}"
    return :green if result == 0
    return :black if BLACk.include?(result)
    return :red if RED.include?(result)
  end

end

INITIAL_BANK=2000
BETTING_LIMIT=50
winnings=[]

10.times do
  bank = INITIAL_BANK
  bet = 1
  count =0

  while 1
    break if ((bank - bet) < 0)
    break if (bank > (1.05 * INITIAL_BANK))
    bank -= bet
    count += 1
    if RouletteTable.spin == :black
      bank += bet*2
      bet = 1
      next
    end
    bet = (bet*2).to_i
    if bet > BETTING_LIMIT
      bet = BETTING_LIMIT
    end
  end
  winnings << bank - INITIAL_BANK
  win = bank - INITIAL_BANK
  #puts "count: #{count}, bank #{bank}, bank - INITIAL_BANK #{win}, bet #{bet}, winnings #{winnings}"
  puts "count: #{count}, bank #{bank}, bank - INITIAL_BANK #{win}, bet #{bet}"
end

profit = winnings.select{|i| i > 0}.length
loss = winnings.select{|i| i < 0}.length
tot = winnings.inject{|acc,i| acc + i}
avg = winnings.inject{|acc,i| acc + i} / winnings.length
puts "Times Won: #{profit}"
puts "Times Lost: #{loss}"
puts "Average win amount: #{avg}"
puts "tot amount: #{tot}"