i believe high concept" refers to the use of strategic concepts, such as basic strategy, card counting, and shuffle tracking, to improve a player's chances of winning.The effect of using high concept in blackjack games can be significant, as it can lower the house edge (the casino's advantage over the player) and increase the player's expected win rate. For instance, using basic strategy alone can reduce the house edge to less than 1%, while card counting can further reduce the edge to the player's favor.