Surrender, especially when you have big bets out, is one of your most powerful index plays. That power is about variance reduction a lot more than increased EV. The variance reduction allows you to bet more which is were most of the EV gain comes from. A Hiopt2/ASC 10:1 optimal spread with surrender that is 20 to 200 would have an optimal spread of 16 to 160 without surrender. You lose 20% of your advantage betting EV when you lose surrender. To see the full effect, for the later optimal bets EV for Hiopt2/ASC with surrender is $58.40/100 rounds and EV without surrender is $40.77/100 rounds for a total loss of 30.2% of EV when you lose surrender. So 2/3rds of the loss when you give up surrender is from decreased optimal bets and the other 1/3rd is from the EV loss from the surrender plays themselves. This is where RA surrender, especially for your biggest bets, gets its power. You get more EV from the bet change from surrendering than the EV loss when it is slightly negative EV to surrender. Overall variance may increase due to betting more but the variance on your worst matchups that you lose the vast majority of the time goes to 0. Surrender is a huge tool for counters that most don't take to its full potential.
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