Hi Deriv Community,
This strategy encourages traders to reduce contract size after a loss and increase it after a successful trade.
To use this strategy on your Bot, go to the “Bot builder” and click "Quick strategy” 
Select Reverse D’Alembert strategy.
You may edit the parameters accordingly and click “Edit” to further check on the strategy. Otherwise, you may click “Run” to automate your trades.
To know more about quick strategy, please refer to this topic: Simple Steps in Setting Up Quick Strategy in Dbot
If you have any questions, please visit our Help Centre or contact us via Live Chat and WhatsApp.