20 years old Turtles strategy still work!!

//@version=2
//coded by tmr0
//original idea from «Way of the Turtle: The Secret Methods that Turned Ordinary People into Legendary Traders» (2007) CURTIS FAITH
strategy("20 years old Turtles strategy by tmr0", shorttitle = "Turtles", overlay=true, pyramiding=5, default_qty_type= strategy.cash, default_qty_value = 1000)

enter_fast = input(20, minval=1)
exit_fast = input(10, minval=1)
enter_slow = input(55, minval=1)
exit_slow = input(20, minval=1)

fastL = highest(enter_fast)
fastLC = lowest(exit_fast)
fastS = lowest(enter_fast)
fastSC = highest(exit_fast)

slowL = highest(enter_slow)
slowLC = lowest(exit_slow)
slowS = lowest(enter_slow)
slowSC = highest(exit_slow)

enterL1 = high > fastL[1]
exitL1 = low <= fastLC[1]
enterS1 = low < fastS[1]
exitS1 = high >= fastSC[1]

enterL2 = high > slowL[1]
exitL2 = low <= slowLC[1]
enterS2 = low < slowS[1]
exitS2 = high >= slowSC[1]


//bgcolor(exitL1 or exitL2? red: enterL1 or enterL2? navy:white)

strategy.entry("fast L", strategy.long, when = enterL1)
strategy.entry("fast S", strategy.short, when = enterS1)
strategy.close("fast L", when = exitL1)
strategy.close("fast S", when = exitS1)

strategy.entry("slow L", strategy.long, when = enterL2)
strategy.entry("slow S", strategy.short, when = enterS2)
strategy.close("slow L", when = exitL2)
strategy.close("slow S", when = exitS2)
//zl=0
//z=strategy.netprofit / 37 * koef  //ежемесячная прибыль
//z=strategy.grossprofit/strategy.grossloss
//z1=plot (z, style=line, linewidth=3, color = z>zl?green:red, transp = 30)
//hline(zl, title="Zero", linewidth=1, color=gray, linestyle=dashed)