Breakouts & channels · daily rule · Software & devices
P&F Double Top on Shopify
What the play says
SHOP with the play, last two years
Shading shows the play's call from the close that triggered it.
Growth of C$10,000 since 2015
Log scale. After trading costs, with T-bill interest while out.
The record
The play against buying and holding SHOP over exactly the same dates, after costs.
| Play, since 2015 | Hold, since 2015 | Play, 5 yrs | Hold, 5 yrs | |
|---|---|---|---|---|
| Annual return | +23.1% | +46.2% | −7.6% | +7.6% |
| Total return | +954% | +7,284% | −33% | +44% |
| Worst drawdown | −60.5% | −83.5% | −60.5% | −83.5% |
| Volatility | 43.9% | 57.8% | 47.4% | 64.5% |
| Sharpe ratio | 0.64 | 0.91 | −0.01 | 0.38 |
| Time invested | 63% | 100% | ||
| Switches per year | 11.4 | 0 |
Every call, graded
Right on 47 of 129 closed calls (36%). In calls averaged +6.0%; out calls saw SHOP move +3.7% on average.
| Called | Call | Price | Until | SHOP moved | Result |
|---|---|---|---|---|---|
| Sep 22, 2026 | IN | C$207.69 | now | +20.9% | open |
| Sep 1, 2026 | OUT | C$194.62 | Sep 22, 2026 | +6.7% | ✕ wrong |
| Jul 28, 2026 | IN | C$183.92 | Sep 1, 2026 | +5.8% | ✓ right |
| Jul 22, 2026 | OUT | C$166.88 | Jul 28, 2026 | +10.2% | ✕ wrong |
| Jun 24, 2026 | IN | C$162.59 | Jul 22, 2026 | +2.6% | ✓ right |
| May 5, 2026 | OUT | C$146.28 | Jun 24, 2026 | +11.1% | ✕ wrong |
| Apr 16, 2026 | IN | C$174.12 | May 5, 2026 | −16.0% | ✕ wrong |
| Apr 10, 2026 | OUT | C$153.55 | Apr 16, 2026 | +13.4% | ✕ wrong |
| Apr 8, 2026 | IN | C$166.27 | Apr 10, 2026 | −7.7% | ✕ wrong |
| Mar 19, 2026 | OUT | C$168.26 | Apr 8, 2026 | −1.2% | ✓ right |
| Mar 4, 2026 | IN | C$176.75 | Mar 19, 2026 | −4.8% | ✕ wrong |
| Jan 20, 2026 | OUT | C$200.06 | Mar 4, 2026 | −11.7% | ✓ right |
An in call is right when the price rose before the next call; an out call is right when it fell. The latest 12 of 130 calls shown.
How the play works
- In on a double-top breakout: the current X column rises at least one box above the top of the previous X column.
- Out on a double-bottom breakdown: the current O column falls at least one box below the bottom of the previous O column.
- Otherwise the rule keeps the chart's last signal.
Boxes are 2% apart, and a new column needs a 3-box reversal (about 6%). Dorsey's classic box table uses fixed price bands; ChartSchool's examples use 1% boxes.
The chart is built from daily highs and lows by StockCharts' high-low method: a new box from the high wins, and the low only counts if it reverses the column.
The signal fires on the day the breakout box fills during the day. Be The Puck acts on that day's close.
Where the rules come from
The case against
Valeriy Zakamulin tested moving-average timing on up to 155 years of U.S. stock data and found no statistically significant edge in the second half of that record. The rules earned their keep in a few severe bear markets and lagged buy and hold for long stretches in between.