Blackjack table

Basic strategy for a pair of 2s against a dealer 10 is to hit rather than split or double, since splitting into two weak hands against a 10 loses more in expectation.

Hard 8 against a dealer Queen (10) is weak and standing would lose most of the time, so hitting is the correct basic strategy play. Double and split are not legal here.

Hand total is 11 against a dealer Queen (10), and standing on 11 is very weak. Doubling is not legal here, so hitting is the best available action.

Soft 15 against a dealer Ace (stands on soft 17, peeked so no blackjack) is best played by hitting; doubling is marginal or negative in this spot and standing on 15 is weak.

Soft 17 against a dealer Ace is a basic-strategy hit. Standing on 17 loses too often to a dealer who has already been checked for blackjack, and the soft hand can't bust on one card.

Hard 17 (A+4+2+K counted as 1+4+2+10) against a dealer Ace, with the dealer standing on soft 17. Hitting risks busting too often, so standing is the standard play.

Hard 10 against a dealer 6 is a strong doubling spot under basic strategy, since the dealer is likely to bust or finish weak and a 10-value card gives me a strong total.

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

Hard 15 against a dealer 7 is a basic strategy hit, since standing loses more often than hitting. Doubling is wrong because the hand is too weak.

Hard 10 against a dealer ten is a close call. Basic strategy for 6 decks with the dealer standing on soft 17 and peeking says to hit rather than double, because the dealer has already checked for blackjack but a ten upcard is still strong.

Hard 19 against a dealer ten is a clear stand, since hitting risks busting with very little to gain.

Hard 13 against a dealer 2 is a basic strategy stand, since the dealer busts often enough with a weak upcard and hitting risks busting a stiff hand.

A hard 20 against a dealer ten is a strong made hand; standing is optimal, and splitting tens or doubling has lower expected value.

Hard 7 against a dealer 4 is too weak to double under basic strategy, which says to hit. Doubling is reserved for hard 9-11 in this spot.

Basic strategy for hard 12 against a dealer 4 is to stand, since the dealer busts often with a 4 showing and hitting risks busting on a 10-value card.

Hard 6 against a dealer ten is a clear hit; doubling is not favorable against a ten and standing on 6 is far too weak.

A hard 8 against a dealer King is a weak hand that can't win by standing, so hitting is clearly the best play. Double is not legal with three cards anyway.

Hard 13 against a dealer 10 is a losing stand, and basic strategy says to hit; with no surrender available, hitting is the best option.

Hard 17 against a dealer 9 is a standard stand; hitting risks busting too often and doubling is clearly negative expected value.

Hard 19 against a dealer 2 is a clear stand under basic strategy; hitting or doubling would add bust risk with no real gain.

Hard 20 is a very strong hand against a dealer King; standing is the basic strategy play, and splitting tens or doubling would lower expected value.

Soft 19 against a dealer ten is a stand by basic strategy; doubling or hitting has lower expected value, and the dealer has already peeked and shown no blackjack.

Hard 17 against a dealer 4 is a standard stand, since the dealer is likely to bust and hitting risks busting a strong hand.

Hard 20 is a very strong hand against a dealer 6; splitting tens or doubling is worse than standing in basic strategy.

Hard 18 against a dealer 5 is a clear stand by basic strategy; doubling or hitting would lower expected value.

Soft 18 against a dealer 10 is a basic strategy hit. The dealer peeked and has no blackjack, so the 10 most likely makes a 20 or a pair-of-tens total, which beats 18 more often than not, and hitting soft 18 gives better expected value than standing.

Hard 16 against a dealer ten is a losing spot, but basic strategy says hitting loses less often than standing, and surrender isn't available.

Hard 19 (7+A+8+3 with ace counted as 1) against a dealer King is a clear stand; hitting risks busting for little gain.

Basic strategy for hard 12 against a dealer 2 is to hit. Standing only wins when the dealer busts, and the odds favor taking a card.

Hard 20 is a very strong hand against a dealer 2, so hitting would almost certainly bust or waste the hand. Standing is the clear choice.