r = Random.new

# Bob picks randomly strat
bobs_winnings = 0.0
10000.times do ||
  b1 = r.rand # bag1
  b2 = r.rand # bag2
  # Doesn't matter what alice does, bob picks randomly
  bobs_winnings += if r.rand > 0.5 then b1 else b2 end
end

puts "Bob's winnings in 10k rounds always picking random: #{bobs_winnings}"

# Bob picks if the bag he's shown is > 0.5
bobs_winnings = 0.0
10000.times do ||
  b1 = r.rand # bag1
  b2 = r.rand # bag2

  # alice shows him the bag nearer 0.5
  bob_sees = if (b1 - 0.5).abs > (b2 - 0.1).abs then "b1" else "b2" end
  other = if bob_sees == "b1" then "b2" else "b1" end

  if eval(bob_sees) > 0.5 then
    # pick what bob saw
    bobs_winnings += eval(bob_sees)
  else
    # Pick the opposite
    bobs_winnings += eval(other)
  end
end

puts "Bob's winnings in 10k rounds always picking the bag if its value > 0.5: #{bobs_winnings}"