According to the link I posted above, the calculated value is the break-even win rate.
So, for SL=TP=10 pips comparing zero spread and spread=1,
Spread=0: (10+0)/(10+10)=0.5 : The break-even win rate is 50%.
For example, 20 trades with 10 wins and 10 losses (50% win rate) breaks even ((10 *...