According to Bukowski’s pattern site the right-angled and ascending broadening chart pattern is not one you should consider trading.
Many other chart patterns perform much better. Downward breakouts have a large break even failure rate which should disqualify them from your trading arsenal. Upward breakouts have only a middling average rise, and that’s if you trade them perfectly.

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Broadening Formations, Right-Angled and Ascending: Identification Guidelines

Characteristic Discussion
Price trend Can be up (66% have a rising price trend) or down (34%) leading to the pattern.
Shape A megaphone tilted up with the bottom horizontal.
Trendlines The bottom trendline is horizontal, the top one slopes upward.
Touches At least two peaks and two valleys should touch their respective trendline.
Volume Trends upward 54% of the time and downward 46% of the time.
Breakout Downward 66% of the time.

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SPX,W Broadening Formation, Right-Angled and Ascending

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Bonus: From zero hedge 

In turn, this means that every push higher in yield, whether orchestrated by central banks, or due to exogenous events like a “taper tantrum” risks upsetting this precariously compressed ERP “spring”, leading to a violent market crash. Because if the ERP is responsible for 92% of the S&P500 move since 2012, or just over 800 points, that would suggest that central bank policies are directly responsible for approximately 40% of the “value” in the market, and any moves to undo this support could result in crash that wipes out said ERP contribution, leaving the S&P500 somewhere in the vicinity of 1,400.

In retrospect, it becomes obvious why the Federal Reserve is petrified about even the smallest, 25bps rate hike.