Time series analysis
Using a time series analysis, this strategy attempts to forecast the close price of the next period. This information is combined with xtrend and smacross to indicate the strength of an expected price move.
Gunbot places a buy order when the ask price crosses under the forecasted price. A sell order is placed when the bid price crosses up the forecasted price.
To refine this strategy, other indicators are available to be used as confirmation for both buying and selling. For example you could have Gunbot buy when the forecasted price crosses up ask and RSI is 30 or lower.