I would sleep fine as well if I were you as a river fold (IMO) is a marginally better play than calling. As played I think you should bet the turn as well and I don't think its really close (I would check back 88-99 as well as jdr mentioned). Not many players are check-raising this turn again with two pair, sets, or made flushes. They will usually just go for immediate value with hopes of getting 3! by AQ-AK and Aces w spade kicker/free showdown/bet river if you catch. I agree with steveistheman when he said "whatever this guy's doing with less than kk seems like a bigger mistake than folding kk's if he is"
. Sometimes going for a weird 10-1 variance play like Villain may have done will accidentally work.
A key piece of information that needs to be mentioned here is that a lot of the semi-pros/pros in this game probably have SD frequencies up to 10-20% lower than "GTO" because they can exploit a large majority of the field pretty well. Most of the recreational players basically never take creative lines, never check-raise semi-bluff, and never bluff raise rivers. However, these pros often have the habit of overfolding too much vs. thinking players as a result. They are so geared toward how 85%+ of field plays who do not take such lines, and the pros do not increase their SD frequencies enough for the other 15%.
The Villain in this hand may or may not have been on his 20th+ hour of play for the weekend and not immediately conceptualized in his head that Hero obviously understands SD frequencies better than the rest of the field too. If, for example, a different Hero in this particular game had KK w no spade, he would often bet and fold turn to a xR v given Villain.
Last edited by NedSchneebly; 10-27-2017 at 02:29 PM.