Blackjack 21 HD: Tips, Tricks and Strategies.

Tips:
1. Learn the basic rules of Blackjack 21.
2. Always assume the dealer's face-down card is a 10-value card.
3. Use a strategy chart to make the best decisions based on your hand and the dealer's upcard.
4. Manage your bankroll wisely and set limits for yourself.
5. Avoid taking insurance bets, as they rarely work in the player's favor.
6. Pay attention to the number of decks in play, as it can affect your strategy.
7. Don't chase losses and avoid making impulsive decisions.

Tricks:
1. Card counting is a powerful trick, but casinos frown upon it and may ban you if caught.
2. Look for Blackjack games with favorable rules like 3:2 payouts and the option to double down after splitting.
3. Consider using a betting strategy like the Martingale, but be cautious as it can lead to big losses.
4. Practice regularly to improve your skills and decision-making.
5. Stay focused and avoid distractions while playing.

Strategies:
1. Always hit when you have a hand value of 11 or less.
2. Stand when you have a hand value of 17 or more.
3. Double down when your hand value is 10 or 11, and the dealer's upcard is 9 or lower.
4. Split pairs of 8s and Aces, but avoid splitting pairs of 5s and 10s.
5. If the dealer's upcard is 7 or higher, keep hitting until your hand value is 17 or more.
6. If the dealer's upcard is 6 or lower, consider standing on a hand value of 12 or more to avoid busting.
7. Adjust your strategy based on the specific rules of the Blackjack game you're playing.