Imagine the villain opens on the button, and we somehow know that he plays with a real tight range. Something like;
88+
ATs+
KJs+
AQo+
SB folds and we are on the BB.
If we are a Level Two player, who can only take into consideration the strength of the opponents range in comparison to our hand, we’d design our continuing range to be stronger than the villains. It would look something like this;
TT+
AJs+
KQs
AKo
If we were a Level Three player, who could also consider how the opponent perceives our range, we would be able to mislead him regarding our strength and so would start to bluff. We know that when we continue it looks like we hold the above range and so; We can REMOVE the weaker portion of said range as we will get almost no value from these hands on later streets. We can ADD to our range the best the hands that the opponent will not expect. Our new range would look something like this;
JJ+, 99, 88
AQs+, A5s – ATs
89s - TJs
AK
If we are a Level Four player, and realize that the opponent knows we’re deceiving him, we need to skim off the bottom portion of our range again, and replace them with the best of the cards the opponent will not expect;
JJ+, 99
AJs+, A8s – ATs
TJs
AK
If you look to the ranges that we would use at the different skill levels, you can see that they gradually get closer and closer to Equilibrium. The first is purely value, the second is bluff heavy, and the third is starting to look like a Nash solution.
If you don’t like my ranges, try it yourself. Choose any situation, consider the ranges that a player from each skill level would use in that situation, and see for yourself how they get closer and closer to Nash as the player advances through the Levels.
Before I came along, everyone in the poker world taught that these Levels are circular, but everyone in the poker world is wrong. GTO is Level Infinity. (Quite a simple mistake for everyone to make, don’t you think? I wonder what makes them all misunderstand these Levels…)

VS