SPECIMEN 007 / STRATEGY AUTOPSYCRYPTO · OUT-OF-SAMPLE TESTED
Donchian / Turtle Breakout
The famous Turtle Traders system. Buy the 20-day high. It makes a fortune — and still can't quite beat doing nothing.
Breakout
Spot · daily · Donchian(20/10)
10 coins · out-of-sample
No edge · coin flip
The claimBuy the breakout — the system that made the Turtles millions.
The realityBeat holding on just 6 of 10 coins. A coin flip you pay fees to make.
Cause of death Whipsaw tax
01 The seduction
Buy when price breaks to a new 20-day high, exit on a 10-day low. This is the system that supposedly turned a group of novices into millionaires in the 1980s. Breakouts lead trends, trends lead profits — and on the big crypto moves it genuinely delivers.
Donchian / Turtle Breakout · BTC
+502%
$1,000 → $6,024 vs $7,538 holding
Beat buy & hold
6 / 10
a coin flip
Out-of-sample
7 / 10
held up in recent years
Simulated on real historical prices, fees included, and past results are not the future. See how we grade →
02 The one line that ends it
No edge
Donchian / Turtle Breakout vs. doing nothinglog scale
The strategyBuy & hold (doing nothing)
Donchian / Turtle Breakout beat holding on 6 of 10 majors — and 7 of 10 out-of-sample. Same money, same window, fees included — measured against simply buying Bitcoin once and never touching it.
03 The evidence
| Coin | Trades | Win % | Strategy | Buy & hold | Verdict |
|---|
| BTC | 51 | 43 | +502% | +654% | lost |
| ETH | 49 | 55 | +1783% | +1285% | beat |
| BNB | 48 | 38 | +1779% | +2792% | lost |
| SOL | 42 | 48 | +28147% | +3395% | beat |
| XRP | 42 | 43 | +1960% | +349% | beat |
| LINK | 55 | 36 | −27% | +132% | lost |
| LTC | 56 | 34 | −63% | −36% | lost |
| DOGE | 37 | 51 | +5897% | +1846% | beat |
| ADA | 46 | 39 | +2088% | +173% | beat |
| AVAX | 39 | 36 | +1827% | +61% | beat |
Beat holding on 6 of 10 coins — and on 7 of 10 in the recent out-of-sample period (the honest test that separates a real edge from a bull-market coincidence).
04 The other direction — what if you also shorted?
The headline test sits in cash when it is not long. The fair question is whether trading both ways helps — so we ran the identical rule with the flat side flipped to a 1x short (still no leverage), same fees, same ten coins.
| View | BTC $1k→ | Median return | Median maxDD | Beat hold | Verdict |
|---|
| Long / flat · headline | $6,024 | +502% | 65% | 6/10 | No edge · coin flip |
| Long / short 1x · illustrative | $1,924 | +92% | 87% | 2/10 | Failed out-of-sample |
Trading it both ways was worse on the headline test — median return +1805% → +179%, worst drawdown 65% → 87% and the verdict fell from no edge · coin flip to failed out-of-sample. And that is before funding: a short is not spot, it needs a derivative that pays borrow/funding (~10–30%/yr) this omits — add a realistic 20%/yr and the median return drops to +15%. Shorting a market that mostly went up is a wrecking ball, not a rescue.
Why the short side is illustrative
You cannot short on spot — it needs a derivative (a perpetual or margin), which is why the headline test is long/flat. These short figures are shown at 1x with no funding or borrow cost, so the real-world version is worse than what you see here, not better. The window is also net-bullish; the short side only pays in a sustained bear, and betting on that is a different strategy entirely.
05 Verdict
So close to a survivor, and that's the interesting part. Biggest headline returns here, held up recently — but it still only beat holding on six coins out of ten, for a mountain of whipsaw trades. Most years it's buy-and-hold with extra steps.
Method — the headline test is long/flat spot, no leverage (the long/short view above is a 1x illustration, funding excluded) · a signal read at the daily close is filled at the NEXT close (a full bar of lag — no look-ahead) · 0.06% fee each side, buy-and-hold charged one entry fee too · each coin over its available Binance daily history with warm-up · out-of-sample = held-back most-recent ~45% of each coin's data (a recency holdout, not rolling walk-forward). Honest limits: the ten coins are today's majors (survivorship bias) and are correlated, so “beat on N of 10” is not N independent tests. Reproducible.
The honest other side
This one earns real respect: the highest returns in the whole set, because when a monster trend shows up it's on it early and rides it. It even mostly held up out-of-sample. If you only care about catching the one move a cycle, it does that.
06 Your turn
That was the textbook version.
We tested it exactly as it's usually described. Yours is probably a little different — a tweak to the settings, an added filter, a different exit. You don't need to code any of it: just describe your version to Vera, our assistant, in plain English, and she builds it and runs it through this same honest test. Most don't survive. A few do — we've proven that. Worth knowing which yours is.
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