I have not played poker in about 12 years and have recently been getting back into it, in some low stakes online games, and a little bit of brick and mortar action. Poker strategy has, not surprisingly, really evolved in the last decade, and the average player seems much better than they were "back in the day". One thing that was commonly understood was the gap concept and people were very hesitant to do things like call a middle position raise in late position with hands like KQo. This seems to have changed somewhat and I am seeing many more competent players flatting with this sort of hand. Could anyone explain how the understanding of "the gap concept" has changed, evolved, or been discarded? It seems obvious to me (and I may be wrong) that it would still be very valid in hot/cold/all in type situations like often occur in tournaments but it is less clear the ramification of flatting with KQo type hands in cash games with deeper stacks (compared to tournaments not necessarily deep by cash standards). any thoughts would be appreciated