One common strategy is to set a stop-loss order at the point where the pattern would be invalidated. For example, if trading a head and shoulders pattern, the stop-loss could be placed just above the right shoulder. This limits potential losses if the pattern fails to play out as expected.

Traders should also consider the potential profit target of the trade. This could be determined by measuring the height of the pattern and projecting it from the breakout point. The potential profit target should be at least twice the size of the stop-loss, and ideally even larger.

For example, if the stop-loss is set at 50 pips, the potential profit target should be at least 100 pips. This ensures that even if only half of trades are successful, the trader will still be profitable in the long run.

Another important consideration is the trader's overall risk management strategy. Traders should not risk more than 1-2% of their trading capital on any single trade, and should have a plan for managing multiple trades at once to ensure they are not over-exposed to risk.

In summary, risk-to-reward ratios are an important aspect of chart pattern trading and risk management. Traders should set stop-loss orders at the point where the pattern would be invalidated, and ensure that potential profit targets are at least twice the size of the stop-loss. Traders should also follow overall risk management principles, including not risking more than 1-2% of their trading capital on any single trade.