Hold'em table

Button open-raise with an ace to pressure the blinds and leverage position.

With As9d (ace-high), I have a strong preflop hand that merits aggression from the small blind. Seat_1's raise to 250 is modest and raisable; a 3-bet to 800 builds the pot with a strong hand while testing opponent strength before the flop.

6c5s offsuit is weak facing a raise and a big 3-bet to 800; folding is clearly correct.

A3 offsuit has sufficient equity against a potentially wide small-blind 3-bet range, especially with position and favorable pot odds. Calling keeps weaker hands and bluffs in.

I have 9d-As (ace-high with a nine kicker) on a 5c-5h-4d flop. This is a marginal hand on the flop. Seat 1 and I have both invested 800 chips and are heads-up. Checking allows me to see the turn without additional risk while keeping the pot small, preserving my ability to fold if Seat 1 bets or to continue if my hand improves.

With ace-high and a gutshot on a paired board, checking back preserves equity and avoids inflating the pot against the preflop aggressor's strong range.

I have 9d-As (weak hand) on a 5-5-4-T board. Both players checked the flop, indicating weakness. Checking again is prudent to control pot size with a marginal hand while keeping equity alive.

The turn card is favorable for representing a strong pair after the preflop call, while our ace-high has limited showdown value. A modest probe can fold out unpaired overcards and some small pairs while retaining our gutshot.

With 9d As (no pair, no draw) facing a 700 chip raise on the turn after checking twice, the hand is weak. Seat 1's turn raise indicates strength, and my hand has poor equity. Folding preserves chips for better opportunities.

3-Ten offsuit is a weak hand that plays poorly out of position against two opponents. Folding minimizes losses with a hand that has poor equity and is unlikely to improve profitably.

A7s is a solid hand heads-up against just the big blind; raising isolates and builds the pot with a strong holding.

8-high suited is too weak to defend against a small-blind raise heads-up, especially out of position.

QQ is a premium hand; raise for value from the button to build the pot and isolate.

4-high suited is far too weak to defend from the small blind against a 4x button open, especially with the big blind still behind.

4-8 offsuit is a weak hand in a 3-handed game. Facing a 4x raise from the button after folding seat_1, my hand has poor showdown value. Folding preserves chips for better opportunities.

9-5 offsuit is a weak button opening hand in this short-handed spot; folding avoids entering with poor equity.

6-10o is a weak hand that is not worth defending the small blind against. Folding minimizes losses when holding a marginal hand out of position.

9-6 offsuit is a weak hand with poor win potential against two opponents. Folding preserves chips for stronger opportunities in future hands.

Weak offsuit hand (63o) heads-up against BB with no fold equity gained; folding is cheap and preserves chips.

Pocket pair on the button; raise for value and to build a pot while isolating the blinds.

9-high with a deuce is far too weak to continue from the small blind facing a button raise.

Jack-Five offsuit is a weak hand against an aggressive raise from the button. Folding the big blind to avoid committing more chips with a dominated hand is prudent.