if(iHigh(symb, 0, 1) > previousHigh && iLow(symb, 0, 1) < previousLow)

//+------------------------------------------------------------------+
//|               Professional Trader Lab EA by profnas100           |
//|                  Trading during London Session                   |
//|                        Copyright 2023, profnas100                |
//+------------------------------------------------------------------+

// Define variables
double previousHigh, previousLow, fairValueGap;
int targetPips = 20;

// Define London session start and end times in broker server time
input string symb = "EURUSD";
input string londonSessionStart = "08:00"; // Adjust the time based on your broker's server time
input string londonSessionEnd = "16:00";   // Adjust the time based on your broker's server time

//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
// Print a message when the EA is initialized
   Print("Professional Trader Lab EA initialized");

// EA initialization logic, if any
   return(INIT_SUCCEEDED);
  }

//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
// Check if the current time is within the London session
   //if(TimeCurrent() >= StringToTime(londonSessionStart) && TimeCurrent() <= StringToTime(londonSessionEnd))
     {
      // Get previous M15 high and low
      previousHigh = iHigh(symb, 0, 2);
      previousLow = iLow(symb, 0, 2);

      // Calculate fair value gap
      fairValueGap = (previousHigh + previousLow) / 2;

      // Check for a market structure shift
      if(iHigh(symb, 0, 1) > previousHigh && iLow(symb, 0, 1) < previousLow)
        {
         // Buy condition: Previous M15 high taken out
         if(iHigh(symb, 0, 0) > previousHigh)
           {
            // Implement your entry logic here
            // For example, enter a long trade at the fair-value gap
            double stopLossLevel = fairValueGap - 10 * SymbolInfoDouble(symb, SYMBOL_POINT);
           }
         // Sell condition: Previous M15 low taken out
         else
            if(iLow(symb, 0, 0) < previousLow)
              {
               // Implement your entry logic here
               // For example, enter a short trade at the fair-value gap
               stopLossLevel = fairValueGap + 10 * SymbolInfoDouble(symb, SYMBOL_POINT);
               int r=OrderSend(NULL,OP_BUY,0.1,Ask,33,stopLossLevel-10*Point(),stopLossLevel+20*_Point,"",0,0,Green);
              }
        }
     }
  }
//+------------------------------------------------------------------+
//|  Expert deinitialization function                                |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
// Print a message when the EA is deinitialized
   Print("Professional Trader Lab EA deinitialized");

// EA deinitialization logic, if any
  }
//+------------------------------------------------------------------+