You need to be good a bit less than 20% make a +EV call.

If we give villain a very strong range that an beat you with all nuts straight, the 2 J9s combo that have GS+FD turn and all better set, you just need him to raise 5 KJ combo (or anything else) to make it a +EV call. So yes his range is strong but his raise is too small to fold your hand.

STOVE:

equity win

Hand 0: 78.125%   { KcKd, KcKh, KdKh, JcJd, JcJs, JdJs, TcTh, TcTs, ThTs, AQs, KcJc, KdJd, Jd9d, Js9s, AQo, KdJc, KhJc, KhJd }

Hand 1: 21.875%  0 { 6c6d }

Text results appended to pokerstove.txt  21  games     0.048 secs      437  games/secBoard: 6s 2d Ks Td JhDead:   equity win tie      pots won pots tied

Hand 0: 52.381%    52.38% 00.00%            11        0.00   { KcKd, KcKh, KdKh, JcJd, JcJs, JdJs, TcTh, TcTs, ThTs, 2c2h, 2c2s, 2h2s, AhKh, AdQd, AsQs, KcJc, KdJd, KcTc, KhTh, JcTc, JsTs }

Hand 1: 47.619%    47.62% 00.00%            10        0.00   { 6c6d }

Whysoeasy, i think this should be a more realistic River raising range for Villain, due to previous actions up to this point in hand. And i think this should be a real easy Bet/call, since i dont see VIllain calling with much worse if i raise River, and that he's 100% folding his bluffs, thus making me more inclined to add 66 Set into my river Bet/calling range