Why Strategy Tournaments Beat Backtesting for Algorithmic Trading

Backtesting creates dangerous illusions through look-ahead bias, overfitting, and survivorship bias, leading traders to overestimate strategy performance before risking real capital. The live tournament approach—running multiple strategies simultaneously in real-time paper trading—exposes flaws within days and reveals which strategies actually perform in live market conditions. This shift from historical optimization to competitive real-time validation represents a fundamental change in how algorithmic traders can reliably validate strategies before deploying them with real money.