https://rulyfi.com/blog The Rulyfi blog on backtesting, scanning and auto-trading, treated as data. How validated strategies are actually built. en Fri, 10 Jul 2026 15:32:45 GMT https://rulyfi.com/blog/how-many-backtests-is-too-many https://rulyfi.com/blog/how-many-backtests-is-too-many Fri, 10 Jul 2026 00:00:00 GMT We ran one 5.7-year crypto search twice, removing four rarely-firing indicator slots the second time. That one change cut the luck bar for every other strategy by more than half, and we predicted the second run's numbers from the first run's export before it started. Here is the dial that actually moves your overfitting hurdle. https://rulyfi.com/blog/agent-api-scanner https://rulyfi.com/blog/agent-api-scanner Wed, 08 Jul 2026 00:00:00 GMT Learn how much of your AI's best backtest is search luck. A lone backtest grades itself against zero; a scan grades it against the 893 variants it beat to look that good. Watch a Sharpe 4.514 short deflate to a Deflated Sharpe of 0.000, then download every candidate with its own dsr and judge the rest yourself. https://rulyfi.com/blog/how-to-combine-trading-strategies https://rulyfi.com/blog/how-to-combine-trading-strategies Sat, 04 Jul 2026 00:00:00 GMT We combined all 1,131,321 pairs of our gauntlet-surviving Bitcoin strategies with zero extra backtests. Only 25% beat simply using the better strategy alone, yet 92% still cleared the luck baseline. Here is how to tell when combining two trading strategies helps and when it just dilutes your best idea. https://rulyfi.com/blog/100-million-backtests-deflated-sharpe https://rulyfi.com/blog/100-million-backtests-deflated-sharpe Fri, 03 Jul 2026 00:00:00 GMT We ran 99,878,688 Bitcoin backtests and measured each with the Deflated Sharpe Ratio. Only 3,130 (0.003%) beat the luck you would expect from searching that hard, and the only result to clear the strictest bar was two survivors pooled into one. Here is the step-by-step method. https://rulyfi.com/blog/backtest-lies https://rulyfi.com/blog/backtest-lies Sat, 13 Jun 2026 00:00:00 GMT A backtest that looks great can still lose money live. The cause is usually not the strategy but how it was measured. Here are the three measurement flaws, and how to catch each. https://rulyfi.com/blog/how-to-read-backtest-results https://rulyfi.com/blog/how-to-read-backtest-results Sat, 13 Jun 2026 00:00:00 GMT What each backtest metric measures, how to read it, and where it fools you. Read Sharpe, profit factor, max drawdown, and win rate as a stack, not as one number. https://rulyfi.com/blog/repainting-closed-candle https://rulyfi.com/blog/repainting-closed-candle Sat, 13 Jun 2026 00:00:00 GMT Repainting is when a signal that appeared mid-candle vanishes once the candle closes. It is look-ahead bias on a live chart. Here is how to spot it and prevent it.