Lets consider a NL HU Match 100BB deep (no rake). Both players are playing GTO (game theoretical optimum).
Lets assume in the GTO Strategy the SB open limps or open raises r times and open folds f times, with f + r = 1. r_ev is the part of the initial pot of 1.5BB the sb wins when r.
r_ev <= 1.
Furthermore I guess it is commonly excepted, that the SB has an positiv expectation. Hence: 0 < ev_sb = -ev_bb = -0.5 * f + r * r_ev * 1.5 ev_sb <= 1 (since the small blind can win from a GTO perspective at the most the 1bb from BB)
We get: r >= 0.3333; r_ev >= 0.3333
Are there more known boundaries for the introduced values?