In chapter 25 of Ace on the River, Barry Greenstein lays out practical “play lessons” that bridge basic starting-hand knowledge and the real-time decision-making needed to become an expert. He emphasizes adapting to people, situations, and long-term patterns rather than treating poker as a set of fixed rules.
From Memorized Starting Hands to Flexible Strategy
Greenstein explains that many players begin by memorizing starting-hand guidelines (especially for hold’em and some forms of lowball). But games like Omaha and stud are too complex to fully memorize, so players must learn general principles and then adjust—especially once there’s action ahead of them. He recommends occasionally deviating from your normal ranges to counter opponents who have begun to exploit your predictability.
Lesson 1: The Same Hand Can Require Different Plays
A “correct” decision depends on who raised, how they tend to play, what the players behind you look like, and how you’re currently perceived. A hand that is a fold against a tight opponent might be a call against a looser player and a re-raise against a wild player you want to isolate. The same idea applies in stud, where upcards and the remaining players dramatically change whether a starting pair is strong enough to continue.
Perfect Play vs. Correct Play
Greenstein separates two ideas:
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Perfect play is what you would do if you could see everyone’s hidden cards.
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Correct play is the decision that wins the most on average using only the information you actually have.
He argues that improving means reviewing hands afterward and learning to recognize what the best-informed decision should have been, even when the result went against you.
Lesson 2: With Strong Hands, Bet More Often Than You “Trap”
He warns that many players get too fancy by checking powerful hands to lure action. In most cases—especially when you have the initiative—betting builds the pot and denies opponents cheap chances to improve. Trapping can backfire by giving free cards that turn a safe situation into a costly one.
Lesson 3: Exit Early When You’re Weak and Not Drawing Well
Greenstein stresses discipline with marginal hands that are unlikely to improve profitably. Continuing with weak draws (especially “second-best” types of draws) often leads to situations where you either miss and waste money or hit but still lose to stronger possibilities. He prefers accepting small losses early over risking big losses later.
Lesson 4: Identify Scare Cards You Can Represent
He points out that players often focus only on the cards that help their actual hand, and miss profitable bluffing opportunities when a card arrives that should help the story they’ve been telling. Recognizing when the board shift favors the range you represent can turn a losing hand into a win.
Lesson 5: Use Bet Sizing to “Define” Your Hand
In no-limit situations, the size of your bet can communicate a minimum strength and force clearer responses. If you under-bet or check at the wrong time, you may give opponents free chances to outdraw you or create confusing, expensive decisions later. Defining your hand earlier can make later streets simpler and safer.
Lesson 6: Sometimes the Best Plan Isn’t “Wait to Hit”
He argues that many hands have more value when you combine drawing potential with aggression—especially through semi-bluffs that can win immediately or still win if you improve. He discusses how this applies across games like lowball, stud, and hold’em: you need a sense of when opponents will fold, when they will keep firing, and how your specific cards block or reduce their strongest outcomes.
Lesson 7: On Later Streets, Narrow Ranges and Bet for Value
Greenstein emphasizes mentally listing plausible hands your opponent can have based on how the betting unfolded, then choosing actions that win against the largest portion of that range. This includes knowing when to value-bet thinly (because your opponent checks worse hands) and when predictable opponents make certain lines only with very strong holdings.
Learning Comes More From Losses Than Wins
He says players remember lessons best when a mistake costs them money. Reviewing hands—especially losing sessions—builds the instinct for which questions matter in real time (who bluffs where, who never raises as a bluff, who telegraphs strength through timing, etc.). He also cautions against being overly results-oriented, since correct decisions can lose and incorrect decisions can win.
Lesson 8: Counter Styles That Pressure You Into Errors
Greenstein describes common opponent tactics (extreme looseness, constant thin value-bets, frequent check-raises, or trying to provoke you emotionally) and warns that the “obvious” response is often wrong. The better approach is to adjust in a way that attacks the tactic directly—without getting dragged into ego battles or trying to outplay weak opponents with overly sophisticated lines they won’t interpret correctly.
Final Message: Expertise Is Iterative and Human
Greenstein closes the chapter’s ideas by implying that even strong players make many mistakes in a session. The goal isn’t perfection—it’s building a process: adapt to opponents, think in ranges, bet with purpose, and study your own decisions so the “right questions” become automatic over time.