Sail has been facing heavy resistance between 90 and 104 price band since May 2006. It finally broke that price band on April 2021 with a huge bullish candle and heavy volumes. It has now come back to retest the resistance-turned-support zone and has also formed a Flag and Pole pattern.
The Perfect entry would be after the flag breakout. The analysis would become invalid if the stock falls below the lower flag trendline