Blackjack table

Soft 19 against a dealer 2 with S17: basic strategy says stand (doubling is only marginal for A8 vs 6), so standing is the standard play.

Hard 15 against a dealer 3 is a basic strategy stand, since the dealer busts often with a weak upcard and hitting risks busting too much.

Hard 17 against a dealer 3 is a stand by basic strategy; hitting risks busting and doubling has negative expected value.

Hard 14 against a dealer 9 is a basic strategy hit: standing wins too rarely against a likely 19, and doubling is not favorable on a 14.

Hard 12 against a dealer ten is a basic strategy hit. Standing relies on the dealer busting, which happens too rarely, so hitting has the higher expected value.

Hard 8 against a dealer ten is a basic strategy hit; doubling is not favorable against a ten, and standing on 8 is too weak.

Hard 16 against a dealer ten is a losing spot either way, but hitting loses slightly less often than standing in basic strategy for a multi-card 16 here; the dealer peeked and has no blackjack.

Hard 16 against a dealer 9 is a basic strategy hit, since standing loses more often than hitting in the long run. Doubling is not advisable with a total of 16.

Hard 19 against a dealer 9 is a clear stand; hitting risks busting with a high chance for little gain.

Hard 20 against a dealer 7 is a very strong hand, so standing is the basic strategy play. Splitting tens is not favorable.

Hard 17 against a dealer 2 is a standard stand; hitting risks busting for little gain, and doubling has negative expected value.

Hard 8 against a dealer 7 is best played by hitting under basic strategy. Doubling is not favorable on 8, and standing on 8 is too weak.

Hard 10 against a dealer 7 is too weak to stand on. Doubling is not legal with three cards, so hitting is the best option.

Hard 18 against a dealer 7 is a clear stand, since hitting risks busting and the expected value of standing is better.

Hard 13 against a dealer 4 is a standard stand, since the dealer is likely to bust and hitting risks busting without enough gain.

Soft 18 against a dealer 8 (dealer stands on all 17s) is a stand in basic strategy; doubling is only correct against 3-6, and hitting is for 9, 10, or A.

Hard 15 against a dealer 6 is a standard stand, since the dealer busts often. Doubling on hard 15 is not favorable.

Hard 12 against a dealer 2 is a hit in basic strategy under these rules (dealer stands on all 17s), since standing only wins if the dealer busts and hitting has the better expected value.

Hard 20 against a dealer 3 is a very strong hand; basic strategy says stand rather than split tens or double.

Hard 11 against a dealer ten is a standard double in multi-deck blackjack. Doubling is positive expected value here, and the dealer stands on soft 17, which doesn't change that.

Soft 15 versus a dealer 7 (stands on all 17s) is a hit by basic strategy; doubling is only recommended for soft 15 against dealer 4-6, so hitting is the better play here.

Hard 15 against a dealer 7 is a loser either way, but basic strategy says hit because the dealer's likely made hand (17+) beats standing on 15 more often than the bust risk costs. Chat is off, so the message is empty.

Hard 17 against a dealer 3 is a stand under basic strategy; hitting risks busting and doubling has negative expected value.