When I first started using RSI in my expert systems, I tried to make LONG signals appear whenever RSI < 30. It didn’t work.
So I let the MT4 genetic algorithm choose the RSI value at which it made sense to enter a trade according to my conditions. And that’s when the shock came:
👉 The genetic algorithm selected RSI = 90 as the LONG threshold.
Everything below that value was considered “good RSI for entry.”
“That’s nonsense,” I thought. So I allowed the genetic algorithm to choose the RSI period as well. It did — and the LONG threshold suddenly dropped to 80.
So I flipped the whole thing around. I added a logical variable to the RSI calculation for a reversed interpretation — essentially a “trend continuation threshold.” In simple terms: anything above this RSI value is good for LONG entries.
And when I saw the optimization results, I finally understood why the genetic algorithm wanted such high values in the first place. In the new reversed version, it selected 70 as the lower RSI boundary for LONG.
Translated:
👉 If RSI is above 70, feel free to enter LONG — the market has the strength to continue.
The genetic algorithm simply wanted me to enter into a clean trend, not against it.
And that’s where the real story begins — what RSI actually is, and what it definitely isn’t.
🟦 What RSI Really Is
1) RSI is an oscillator based on strength ratios
RSI (Relative Strength Index) tells you nothing about trend, patterns, or market structure.
It only measures:
How strong recent upward moves were compared to downward moves.
Nothing more.
No magic.
No predictions.
Just math.
2) RSI is a momentum indicator, not a directional indicator
RSI will not tell you:
- where the market will go
- when it will reverse
- where the bottom is
- where the top is
It only tells you:
“In the last X candles, upward/downward moves were stronger than the opposite side.”
That’s it.
3) RSI is good at detecting extremes — but not at trading them
Yes, RSI can show:
- extreme momentum
- overextended moves
- short-term imbalances
But that does not mean:
“RSI above 70 = sell”
“RSI below 30 = buy”
This is the biggest myth in retail trading.
🟥 What RSI Definitely Isn’t
1) RSI is not a trend reversal indicator
RSI in an extreme does not mean the market will reverse.
👉 Strong trends can keep RSI in extremes for weeks.
That’s a sign of trend strength, not its end.
2) RSI is not an overbought/oversold indicator
That’s marketing, not reality.
The market is not “overbought” just because RSI shows 80. The market is not “oversold” just because RSI shows 20.
A market is overbought/oversold only when buyers/sellers stop appearing. RSI cannot measure that.
3) RSI is not a predictor of future movement
RSI is reactive, not predictive.
It shows what has happened, not what will happen.
4) RSI is not a standalone strategy
Using RSI as:
an entry signal
an exit signal
a filter
or even a “holy grail”
…is a path to disaster.
RSI is a diagnostic tool, not a system.
🟩 How to Use RSI Correctly
1) RSI as a trend strength gauge
In a strong trend:
RSI stays high (long)
or stays low (short)
This is a signal:
👉 “The trend is healthy — don’t trade against it.”
2) RSI divergence as a supplementary warning
Divergences are not entry signals. They are warnings that momentum is weakening.
That’s a big difference.
3) RSI as a filter for trade entries
RSI is not a signal. RSI is not an entry. RSI is not a prediction.
RSI is a sentiment multiplier, telling you:
“The market currently tends to continue or slow down.”
And that is exactly its proper role.
🟨 Why RSI Is So Often Misunderstood
Because most traders:
look for simple signals
want “buy here, sell there”
don’t understand momentum
ignore context
use RSI in isolation
And RSI in isolation is useless.
🟪 Conclusion: RSI Is a Great Servant, but a Terrible Master
RSI is a useful tool if you know:
what it measures
what it doesn’t measure
how to interpret it
how to place it in context
But if you use it as:
a reversal signal
a buy/sell trigger
a predictor of future movement
…you will be disappointed.
RSI is not a crystal ball. It’s just math.
And math doesn’t lie — people just interpret it poorly.