Blackjack table

A hard 8 against a dealer 2 is too weak to stand, and doubling is only reasonable on 9 to 11, so hitting gives the best expected value.

Hard 18 against a dealer 2 is a stand, since the dealer's weak upcard gives a good chance of busting and hitting would risk a bust on most draws.

A hard 8 against a dealer 8 is a weak total, but doubling is only worth it on 9-11 and splitting 4s is poor here, so hitting is the best option.

Hard 18 against a dealer 8 is a strong standing total, since the dealer's likely final hand is weak and hitting risks busting on a 10-value card.

A hard 5 can't bust on one card, and against a dealer 10 it is a standard hit rather than a double.

Hard 13 against a dealer 10 is a losing stand, so basic strategy calls for a hit; the bust risk is smaller than the expected loss from standing.

Hard 16 against a dealer 10-card is a losing hand to stand on, and busting costs no more than standing in expectation here, so hitting is the basic-strategy play. Doubling is not favorable with 16.

Hard 20 is a strong total and busting on a hit is far more likely than improving, so standing against the dealer's Jack is correct.

Hard 14 against a dealer 9 is a losing stand, and doubling is only worth it on hard 11 or so, so hitting gives the best expected value.

Hard 17 against a dealer 9 is a stand in basic strategy, since busting on a hit is likely and the dealer's 9 is a reasonably strong upcard to face.

Hard 12 against a dealer 3 is a hit under basic strategy, since the dealer's bust chance is still too low to justify standing. Doubling is not favorable with 12.

Hard 20 is a strong total that beats most dealer outcomes, and the dealer's 3 upcard is weak, so standing is clearly correct.

Soft 19 is already a strong total against the dealer's 10, and doubling here gains little while adding risk. Standing keeps the bet at a favorable expectation.

Hard 13 against a dealer queen is a losing stand, and basic strategy hits here since the dealer has a strong 10-value upcard. Doubling is only worthwhile on 9 to 11.

A hard 17 is a stand against a dealer queen, since the dealer's likely total of 10 is strong and hitting risks busting on most of the remaining cards.

Hard 16 against a dealer 7 is a losing stand, and doubling is not favorable here, so hitting is the basic-strategy play.

Standing on 15 against a dealer Ace loses most of the time, and doubling is weak with a hard 15. Hitting is the best available option since surrender is not allowed.

A hard 8 against a dealer Ace is a weak total that can't stand, and doubling on 8 isn't worth the extra risk, so hitting gives the best expected value.

Hard 15 against a dealer Ace is a losing stand, and surrender is not available, so hitting is the better play under basic strategy.

Hard 10 against a dealer 4 is a strong doubling spot since the dealer is likely to bust, and doubling takes advantage of that edge with one more card.

Soft 14 against a dealer 4 is a strong double spot, since the dealer's weak upcard gives good odds to win an extra card and a doubled bet.

Hard 15 against a dealer 9 is a losing stand, and the dealer's likely strong total makes hitting the better option. Doubling is not worth the extra risk at this total.