The pattern is a continuation pattern in GBPJPY . There are 2 ways to trade this pattern.
1) Aggressive method (Long GBPJPY on breakout)
Place a buy stop order on breakout above 173.50
2) Conservative method (wait for retracement)
After GBPJPY breakout decisively above 173.50, wait for any pullback to 173.50.
Place a buy limit order 173.50