関連ワード:  blackjack basic strategy when to hit    blackjack basic strategy hit soft 17    blackjack basic strategy hit 17    blackjack basic strategy dealer hits soft 17    blackjack basic strategy chart hit soft 17    blackjack strategy when to hit    blackjack basic strategy 6 deck hit soft 17    blackjack basic strategy chart dealer hits soft 17    blackjack basic strategy explained    blackjack basic strategy advantage