Blackjack table

I have 20 (Q♠ T♠) against dealer's K♠ (counting as 10). Twenty is a very strong hand; doubling risks busting and standing wins against most dealer outcomes since the dealer needs exactly 21 to push or win.

Hard 12 against dealer's 5 is a borderline hand where standing is optimal. The dealer's 5 is a weak upcard with high bust probability, and hitting 12 risks busting (any card 9+ busts). Basic strategy favors standing here to let the dealer bust.

With a hard 17 against dealer's 4 (a weak upcard), standing is optimal. The dealer busts roughly 40% of the time from a 4, and hitting a 17 is very likely to bust or result in a weaker hand. Doubling down is unfavorable due to the high bust risk.

With 10 (6-4) against dealer's 7, doubling down is the optimal play. A 10 is a strong doubling hand, and the dealer's 7 is vulnerable; doubling maximizes expected value by risking additional chips to capitalize on this favorable situation.

With a hard 7 against dealer's 10, hitting is the optimal play. The dealer's 10 is a strong card, and I need to improve my hand significantly. Doubling would be too risky with such a weak starting total.

With a hard 17 against dealer's 10, standing is the correct play. Hitting risks busting while the dealer will likely stand on 17 or higher, making this a break-even situation where doubling risk outweighs potential gain.

With a hard 6 against dealer's Queen (10-value), hitting is correct basic strategy. The dealer's strong upcard means I need to improve my hand, and the risk of busting on 6 is minimal.

With a hard 9 against dealer's Queen (10-value), hitting is the mathematically optimal play. The probability of improving without busting is high (most cards help), and standing at 9 loses to most dealer hands.

I have 19 (2+4+3+K), which is a strong hand. The dealer shows a Queen (10-value card), which is strong but my 19 beats any non-blackjack dealer total. Standing maximizes expected value.

With a hard 17 against dealer's 10-value card, standing is the correct basic strategy play. Hitting risks busting (any card 5+ busts), while standing gives a reasonable chance as the dealer must hit soft 17 and risks busting themselves.

With a hard 12 against dealer's 3 (weak upcard), standing is optimal. Dealer's 3 is a stiff card prone to busting; hitting risks busting my 12 to 16 range. Basic strategy recommends standing on 12 vs 3.

With a hard 16 against dealer's Ace, standing is the mathematically optimal play. Hitting would bust more often than it improves the hand, and doubling would only increase losses in a bad spot.

Soft 17 (Ace-6) vs dealer 5 is a stand scenario. The dealer's weak upcard (5) is likely to bust, and doubling soft 17 creates too much risk of busting or ending with a weak total. Standing maximizes expected value here.

With a hard 17 against dealer's 3, standing is the optimal play. The dealer's weak upcard (3) is likely to bust, and hitting risks busting our hand or improving the dealer's position unnecessarily.

With a hard 20 against dealer's 6 (a bust card), standing is optimal. This hand wins in most scenarios and doubling would risk losing money unnecessarily.

With a hard 19 against dealer's 9, standing is the optimal play. My hand is strong and unlikely to improve; hitting risks busting while doubling is unnecessary given the hand's already strong value.

I hold 20 (Jack-Queen), which is a very strong hand. The dealer shows a Queen (10-value card), meaning the dealer likely has 10 or a blackjack. Standing on 20 is the optimal play as hitting risks busting while the hand is already excellent.

With a hard 12 against dealer's 6 (a bust card), standing is optimal. The dealer has a high probability of busting, and hitting risks going over 21 with my stiff hand.

Hard 9 vs dealer 6 is a classic double-down spot. The dealer's 6 is a bust card (busting frequency ~42%), and doubling here maximizes expected value when the dealer is weak. Hitting risks getting a stiff hand, while doubling leverages the dealer's poor position.

With a hard 8 against dealer's King (10-value), hitting is the optimal basic strategy play. The hand is too weak to stand, and doubling is not recommended in this position as 16 or 17 still loses to the dealer's likely 10-value hand.

With a hard 18 against dealer's King (likely 10-value), standing is optimal. The hand has strong value and hitting risks busting; basic strategy recommends standing on 18 versus any dealer upcard.