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Tier 3Lesson 10 of 20

RSI & Divergence

Momentum that fades before price turns

10 min+60 XP Spot the Divergence

The Relative Strength Index measures how forcefully price has been moving, not where it is. That makes it useful for one thing above all: spotting when a move is running out of energy before price itself turns.

01What RSI measures

RSI compares the average size of up-closes with the average size of down-closes over the last 14 periods and scales the result from 0 to 100. Readings above 70 are called overbought, below 30 oversold — but those labels describe momentum, not value.

RSI
100 − 100 ÷ (1 + average gain ÷ average loss)
Wilder’s smoothing over 14 periods by default.
Watch outOverbought can stay overbought

In strong trends RSI can sit above 70 for weeks while price keeps rising. Shorting simply because RSI is high is one of the most expensive habits in trading.

02Divergence: when momentum and price disagree

100.0105.0110.0115.0Higher highHigh 1High 2305070RSI (14)
IllustrativePrice makes a higher high, but RSI (bottom panel) makes a lower high: bearish divergence. The second push had far less force behind it.
TypePriceRSIImplication
Regular bearishHigher highLower highUpside momentum fading — possible reversal down
Regular bullishLower lowHigher lowDownside momentum fading — possible reversal up
Hidden bullishHigher lowLower lowPullback in an uptrend — continuation up
Hidden bearishLower highHigher highBounce in a downtrend — continuation down

03Turning divergence into a trade

Divergence tells you momentum has changed, not direction. Markets can diverge two or three times before turning. The trigger professionals wait for is a break of structure in the new direction — for bearish divergence, a close below the most recent higher low.

Low-quality divergence
  • Mid-range, at no meaningful level
  • Against a strong higher-timeframe trend
  • Entered with no structural trigger
High-quality divergence
  • At a higher-timeframe level or after a liquidity sweep
  • Confirmed by a lower-timeframe structure break
  • Clear invalidation just beyond the extreme
TipRSI(2) for mean reversion

A 2-period RSI is a completely different tool: it flags extreme short-term pullbacks inside long-term trends. The RSI(2) Mean Reversion template in the Backtester is one of the few retail strategies with decades of positive evidence on equity indices.

Key takeaways
  • RSI measures momentum on a 0–100 scale.
  • Overbought and oversold are not signals on their own.
  • Regular divergence warns of reversal; hidden divergence supports continuation.
  • Confirm divergence with a structure break before acting.
Common mistakes
  • Shorting every reading above 70
  • Trading divergence without a trigger
  • Drawing divergence between non-matching swings

Complete “Moving Averages” to unlock this challenge.

Go to Moving Averages