chance     = 0.99
maxbalance = balance
wincount = 0

function getmulti()
	local payout=(100-1)/chance
	return (payout/(payout-1))
end

function getBaseDiv()
	return (math.sqrt( balance ) * 100000)
end

base = balance/getBaseDiv()
nextbet = base

function dobet()	
	if win then
	
		wincount = wincount + 1
		
		if wincount > 10 then
		
			wincount = 0
                        ...
			
		end
		
		base = balance/getBaseDiv()
		nextbet = base
		checkMaxBalance()
	else
	
		nextbet = previousbet*getmulti()
	end	
end

function checkMaxBalance()
	if balance > maxbalance then
		print("new max: "..string.format("%9.8f", balance))
		maxbalance = balance
	end
end