The books... not free though
A long triggers when Williams %R(14) crosses above -80, and a short when it crosses below -20. Longs close once %R is above -50 and shorts once it is below -50. A 1% stop protects each trade.
Best run of 16. Nasdaq 100, 30 min, spread 3, from run sweeps:2026-09-07-NAS100-30m-opt.tsv:20.
| Period | Up to 2026-09-07 |
| Instrument | Nasdaq 100, 30 minutes |
| Spread | 3 points |
| Contracts | 1 |
| Starting capital | 1,000,000 |
| Costs | Spread only. Commissions and overnight financing are not included. |
| Bars | Up to 200,000 bars, fewer where the instrument has less history |
| Last tested | 2026-09-07 |
| positionSize Contracts per trade | 1 |
| williamsPeriod Williams %R length | 14 |
| oversoldLevel Buy when %R climbs back above this | -80 |
| overboughtLevel Sell short when %R drops back below this | -20 |
| williamsExitLevel Close the trade when %R passes the midpoint | -50 |
| stopLossPct Protective stop, percent of entry price | 1 |
Every run
| Market | Timeframe | PF | Trades | Win % | Net | Max DD |
|---|---|---|---|---|---|---|
| Nasdaq 100Best run | 30 min | n/a | 15,667 | 50.90 | -49,262 EUR | -52,557 |
| S&P 500 | 1 hour | n/a | 10,263 | 56.35 | -7,052 EUR | -8,015 |
| Gold | 1 hour | n/a | 9,699 | 57.39 | -9,119 EUR | -9,156 |
| Gold | 15 min | n/a | 14,468 | 54.14 | -9,529 EUR | -9,665 |
| Gold | 5 min | n/a | 14,142 | 54.80 | -9,878 EUR | -9,935 |
| Gold | 30 min | n/a | 14,830 | 56.59 | -10,448 EUR | -10,499 |
| S&P 500 | 5 min | n/a | 14,243 | 50.78 | -13,127 EUR | -13,148 |
| S&P 500 | 30 min | n/a | 15,196 | 53.33 | -14,271 EUR | -14,775 |
| S&P 500 | 15 min | n/a | 14,583 | 55.94 | -15,426 EUR | -15,445 |
| Nasdaq 100 | 1 hour | n/a | 10,801 | 52.13 | -28,487 EUR | -29,626 |
| DAX 40 | 1 hour | n/a | 9,341 | 59.93 | -36,842 EUR | -37,955 |
| DAX 40 | 15 min | n/a | 14,650 | 60.25 | -42,611 EUR | -44,380 |
| Nasdaq 100 | 5 min | n/a | 14,125 | 58.06 | -46,027 EUR | -46,375 |
| DAX 40 | 5 min | n/a | 14,319 | 56.23 | -47,307 EUR | -47,598 |
| Nasdaq 100 | 15 min | n/a | 14,795 | 59.13 | -50,134 EUR | -52,157 |
| DAX 40 | 30 min | n/a | 15,097 | 59.31 | -59,845 EUR | -63,442 |
Charts
Top 10 of 16 runs. The full list is in the table above.
The code
// ============================================================ // Williams %R Reversal // ProRealAlgos Strategy Library | prorealalgos.com // Type: Mean reversion // Direction: Long & short // Timeframe tested: 30 minutes // ============================================================ // --- Settings --- DEFPARAM CumulateOrders = false // --- Parameters --- positionSize = 1 // contracts per trade williamsPeriod = 14 // Williams %R length oversoldLevel = -80 // buy when %R climbs back above this overboughtLevel = -20 // sell short when %R drops back below this williamsExitLevel = -50 // close the trade when %R passes the midpoint stopLossPct = 1 // protective stop, percent of entry price // --- Indicators --- williamsValue = Williams[williamsPeriod](close)
26 more lines: the entry and exit rules.
Setup
Questions
It can run in ProOrder, but every backtest lost money. It is shown here as a result, not a recommendation.
Nasdaq 100, S&P 500, Gold and DAX 40. The smallest loss was S&P 500 1 hour at EUR -7,051.78, and DAX 40 30 minutes lost EUR -59,845.2.
The Nasdaq 100 run had a EUR 52,556.9 drawdown with 1 contract.
No. Every run from 5 minutes to 1 hour lost money.
Related
Copy trading on US indices is available to ProRealAlgos members as spots open.
