Chart patterns are not magic shapes. Each one is a picture of a specific tug-of-war between buyers and sellers, and the "signal" is simply the moment one side visibly loses. If you understand what the fight is about, you can read patterns you have never seen a textbook name.
Reversal patterns: the trend runs out of buyers
A head and shoulders is three pushes higher where the third push fails to beat the second. That is the entire message: an uptrend that could set a higher high twice in a row suddenly cannot. The line connecting the two dips between the pushes is the neckline, and the pattern only completes when price closes below it. Until that close, it is just three bumps — most "head and shoulders" you will spot intraday resolve upward and were never patterns at all.
A double top is the same failure with two pushes instead of three: price hits a level, retreats, returns, and fails at the same place. The confirmation is a break of the low between the two tops. Double bottoms and inverse head and shoulders are the mirror images at the end of downtrends.
The textbook target for all of these is the height of the pattern projected from the breakout point — if a head and shoulders is 80 pips from head to neckline, the projected move is roughly 80 pips below the neckline. Treat that as a rough estimate of how much fuel the reversal has, not a promise.
Continuation patterns: the trend catches its breath
Flags are small, tight channels that drift against the prevailing trend after a sharp move — a burst higher, then a shallow downward drift on falling volume. The logic: the sharp move attracted profit-taking, but no real sellers showed up, so when the drift breaks in the direction of the original move, the trend resumes. Pennants are the same pause drawn as a small triangle instead of a channel.
Triangles come in three flavors. An ascending triangle has a flat ceiling and rising floor — buyers are getting more aggressive while sellers defend one level, and it usually resolves upward. A descending triangle is the mirror. A symmetrical triangle — both sides converging — carries no directional bias at all; it just tells you volatility is compressing and a decision is coming. Trading the break, not predicting it, is the only honest way to use one.
Wedges are converging patterns that slope. A rising wedge — higher highs and higher lows, but converging — shows each rally covering less ground than the last, and tends to break down. A falling wedge tends to break up. They sit awkwardly between reversal and continuation, which is a polite way of saying: wait for the break.
Why the textbook version rarely appears
Real charts are noisy. Necklines slope. Shoulders come in unequal sizes. A double top's two peaks can differ by ten pips and still be the same failure. If you demand geometric perfection you will find one clean pattern a month; if you look for the underlying story — a trend that stopped making progress, or a sharp move followed by a shallow, low-energy pause — you will see it everywhere, because that is how markets actually move.
Two filters improve almost any pattern trade. First, location: a double top printed into a level that was already resistance on the daily chart means two timeframes agree. A pattern in the middle of nowhere is just noise. Second, volume, where your market shows it: breakouts that matter tend to happen on expanding activity, and flags are more trustworthy when the pause happens on shrinking activity.
The failure is also a trade
Patterns fail constantly, and the failure is information. A head and shoulders that breaks the neckline, cannot follow through, and climbs back above it has trapped every breakout seller — and their exits become buying fuel. Some traders trade almost nothing but these failed-pattern reversals. At minimum, know where your pattern is invalidated before you enter, and treat a close back through the breakout level as the market telling you the story changed.
How to practice honestly
Scroll a chart back, cover the right-hand side, and mark the pattern before revealing what happened. You will discover two things quickly: you see far more patterns when you already know the outcome, and the clean ones that work are rarer than any textbook implies. That discovery — hindsight bias, measured on your own eyes — is worth more than the patterns themselves.