So out of the four trades, Nicolas was successful in two trades and was unsuccessful in the other two trades, which means 50% of the times he was right and the rest 50% of the times he was wrong. Despite being right only 50% of the time, Nicolas still earned huge profits. This was possible because, wherever his trades went wrong he had maintained stop-losses and whenever his trades worked in his favor, he increased his investments there. In this way, Nicolas Darvas was able to increase his profits and cut short his losses.