This strategy combines calculations of daily volume change and the NVI indicator to trade short-term market swings.

Specifically, it counts the number of days volume is lower than previous day, and uses NVI value change to form an oscillator. Long signals are generated when the oscillator flips from negative to positive, and remains positive on the 2nd candle. Short signals occur on the flip from positive to negative, while still negative on 2nd candle.

The advantage of this strategy is capitalizing on short-term gaps within just 2 candles. However, such high frequency trading risks overoptimization, with performance varying greatly across market time periods.

Also, trading fees can be a concern for such short-term trades, requiring parameter tuning per instrument. And slight errors in decisions within small timeframes could lead to losses. Only by strictly controlling per trade position sizes can this dual candle strategy be applied successfully over the long run.