Blackjack table

Hard 8 against a dealer 2 is a basic strategy hit; doubling is only recommended on 9-11, so hitting is the best play.

Hard 18 against a dealer 2 is a clear stand; hitting risks busting for little gain.

Pair of 4s against a dealer 8 is best played as a hit under basic strategy. Doubling a hard 8 against an 8 is not favorable, and splitting 4s is worse than hitting.

Hard 18 against a dealer 8 should stand: hitting risks busting on most cards, and standing has a positive expectation against an 8.

Hard 5 against a dealer ten is far too weak to stand on, and doubling is not favorable against a ten, so hitting is the basic strategy play.

Hard 13 against a dealer Queen (10) is a basic strategy hit, since standing loses more often than hitting in expectation.

Hard 16 against a dealer ten is a close call, but without surrender, basic strategy says hit (hard 16 vs 10 is a hit in a multi-deck game with no surrender). Standing loses more often in the long run.

Hard 20 (Q+6+4) against a dealer ten is a strong hand; standing is clearly correct since hitting risks busting on nearly any card but an ace.

Hard 14 against a dealer 9 is a basic strategy hit: standing loses too often against a strong upcard, and doubling is not favorable with only 14.

Hard 17 against a dealer 9 is a stand in basic strategy; hitting risks busting with little gain.

Basic strategy for hard 12 against a dealer 3 is to hit (stand only against 4-6). Doubling a hard 12 is not recommended.

Hard 20 is a very strong hand against a dealer 3; hitting would almost certainly make it worse, so standing is correct.

Soft 19 against a dealer ten is a stand in basic strategy; hitting or doubling has lower expected value.

Hard 13 against a dealer ten is a losing spot either way, but basic strategy says hit: standing loses more often than hitting here. Doubling is incorrect with a hard 13 against a ten.

Hard 17 against a dealer Queen: standing is the basic strategy play, since hitting risks busting too often to be worthwhile.

Hard 16 against a dealer 7 is a hit by basic strategy, since the dealer likely holds a made hand of 17 or better and standing wins too rarely. Doubling is not advisable on a hard 16.

Hard 15 against a dealer Ace (dealer stands on soft 17, peeked so no blackjack) is a weak spot. Basic strategy for 6 decks S17 with no surrender is to hit, which has a slightly lower expected loss than standing.

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

Hard 15 against a dealer Ace (who has already peeked and has no blackjack) is a weak hand, and basic strategy says to hit; standing loses more often than hitting.

Hard 10 against a dealer 4 is a standard double, since the dealer is likely to bust or finish weak and a 10-value card gives a strong 20.

Soft 14 vs dealer 4: basic strategy for A3 is to double against 5-6 only, and hit against 4 (stand-on-soft-17 charts show A3 doubles only against 5-6). So hit.

Hard 14 (ace counted as 1) against a dealer 4, which is a weak upcard with high bust odds, so basic strategy says to stand.

Hard 15 against a dealer 9 is best played by hitting under basic strategy. Doubling is not favorable on 15, and standing loses more often than hitting does.