Momentum breakout — buy above 20-day high

• Buy when today's close > max(close[-20..]) (new 20-day high)
• Sell when today's close < min(close[-10..]) (new 10-day low)

Markets trend. A new high confirms demand is eating supply. The trend continues until something breaks it — that break is signalled by the opposite extreme.

Choppy sideways markets give you repeated breakout → reverse → breakdown → reverse whipsaws. You lose transaction costs on every whipsaw.

Take at least 3 trades, positive or negative PnL both pass (we're training the structure).