Blackjack table

Total 20 is a strong hand; standing maximizes expected value against dealer's K upcard.

Hard 12 against dealer 5 is a stand under basic strategy since the dealer is likely to bust.

Hard 17 against a dealer 4 is a standing hand; hitting risks busting, and doubling is not justified with a made total of 17.

With a hard 10 against the dealer’s 7, doubling is the optimal basic-strategy play, maximizing value from a strong starting total.

Hard 7 against a dealer 10 is a losing stand, so I hit to try to improve toward 17 or better. Doubling on a 7 versus a 10 is not favorable.

Hard 17 against a dealer 10 is a standing hand; hitting risks busting with little chance to improve enough to beat a likely strong dealer upcard.

Hard 6 against a dealer 10 is a clear hit; standing or doubling would be far too weak with only 6 total.

Hard 9 against a dealer queen is a hitting hand; standing on 9 would leave too little chance to beat a likely strong dealer total.

Hard 19 against a dealer queen is a strong standing hand; hitting risks busting with little chance to improve.

Hard 17 vs dealer Jack; dealer already peeked and lacks blackjack, so standing is the optimal play. Hitting risks busting and doubling a total of 17 against a strong upcard is -EV.

Hard 12 against a dealer 3 is a basic-strategy hit; standing risks losing to any dealer made hand, while doubling is not warranted on a non-advantage total.

Hard 16 against a dealer Ace is a losing stand, so I hit to try to improve without risking an extra double bet.

Hard 13 against a dealer 6 is a standing hand; the dealer is likely to bust, so hitting or doubling would only add risk without improving expected value.

With a hard 6 against the dealer's 8, hitting is correct; splitting 3s against an 8 is not favorable, and doubling is not appropriate for this weak total.

Hard 14 against a dealer 8 is a losing stand, so hitting gives the best chance to improve without busting immediately.

With a hard 12 against the dealer's 10, standing risks losing immediately, while hitting gives a chance to improve without busting on most cards. Splitting or doubling a 12 against a strong upcard is not favorable.

I have 20, a very strong hand. The dealer shows a Queen, so standing is clearly optimal; hitting risks busting and doubling/splitting would only add risk to an already excellent total.

Hard 12 against a dealer 6 is a standing hand: the dealer is in bust territory and hitting my 12 risks busting with no need to improve.

With a hard 9 against the dealer's 6, doubling is the optimal basic-strategy play to maximize expected value.