Range polarization is the approach of constructing a betting range composed exclusively of premium value hands and pure bluffs, leaving medium-strength hands in the checking range. This strategy is optimal in river spots where no further streets exist for protection and bet sizing can be maximized. On boards where the bettor holds clear nut advantage, polarization enables overbets that exploit the opponent’s inability to hold sufficient nuts to call. The correct bluff-to-value ratio in a polarized range is determined by the alpha of the chosen bet sizing.