Players adapt their blackjack strategies based on game conditions by evaluating factors such as the dealer's upcard, the deck composition, and specific table rules. For instance, they may increase their aggression against a weak dealer card while playing conservatively against a strong one. In games with fewer decks, players might use card counting to inform their decisions. They also adjust their strategies according to table rules like doubling down options and payout variations. Successful players remain flexible and observant, modifying their approach in response to the game's dynamics and the behavior of others at the table.