A simple two‑ETF switch: buy whichever of SPY (broad U.S. stocks) or XLE (energy) looks most oversold on a 6‑month RSI. All‑in on that pick, aiming for mean reversion. Straightforward but concentrated and potentially volatile.

At each check, it compares two ETFs: SPY (S&P 500, big U.S. stocks) and XLE (energy companies). It computes a 6‑month RSI—a 0–100 score of recent losses vs gains; lower = more beaten down. It buys the one with the lower RSI (a contrarian rebound bet), putting 100% there, and holds until the next check. No routine rebalancing; the 10% drift band matters little with one holding.

Two-ETF contrarian switch (SPY vs XLE) targets mean-reversion. In out-of-sample tests it shows lower market risk (beta ~0.67), smaller drawdowns (14.8% vs 18.8%), and better risk-adjusted profile (Calmar ~0.48) versus the S&P—offering downside protection with equity exposure.