Learn poker
Short, practical reads on the ideas behind better play, from what GTO actually means to how to study a hand. Each one points at a tool on this site so you can put it to work straight away.
- Using the site4 min read
Why I built jarvispoker: the $2,000 lesson that became a study tool
The founder story behind jarvispoker: $10 home games, a $2,000 tilt hole, three years of learning from mistakes, and why the fix became a free photo-to-GTO study tool.
- Strategy4 min read
Overbetting in poker: when a bet bigger than the pot is correct
An overbet is any bet larger than the pot, and it is one of the strongest tools in modern poker when your range is polarised or nut advantaged. Here is the fold equity math behind it, and why overbetting the wrong range is a leak.
- Fundamentals4 min read
Poker positions explained: what UTG, CO, BTN, and the blinds mean
Poker positions such as UTG, HJ, CO, BTN, SB, and BB describe your seat relative to the button, and that seat decides how much information you get and which hands are worth playing. This guide names every seat at a 6-max and full ring table and groups them into early, middle, late, and the blinds.
- Fundamentals3 min read
Nash equilibrium in poker: the idea behind GTO
A Nash equilibrium is the point where no player can gain by switching strategies while everyone else holds still. Here is what that means in plain terms, why poker's equilibrium is a mixed strategy, and why solvers only ever approximate it.
- Strategy4 min read
ICM in poker: why your chips are not worth face value
ICM, the Independent Chip Model, converts your tournament chip stack into real money equity using the prize pool and every stack left in the field. It explains why the chip you already have is worth more than the chip you are trying to win.
- Strategy4 min read
Semi-bluffs: the bet that wins two different ways
A semi-bluff is a bet or raise with a hand that is probably behind now but can improve into the best hand later. It combines fold equity with real drawing equity, which is why it beats a pure bluff and often beats checking.
- Strategy4 min read
Wet and dry boards: reading texture before you bet
A dry board like A-7-2 rainbow keeps equities frozen and rewards small, frequent bets. A wet board like 9-8-7 two-tone lets equities swing hard, which calls for bigger, more selective ones.
- Fundamentals4 min read
How to review a poker hand (and know if it was the right play)
A repeatable five-step method for reviewing a hand after the session: separate the result from the decision, rebuild both ranges, check the pot odds, compare it to a solver, and find the exploitative adjustment.
- Strategy6 min read
Check-raising explained: when and why to check-raise
A check-raise is checking with a plan to raise when your opponent bets. Learn when to use it, which boards favour it, and how to balance value and bluffs.
- Strategy6 min read
Bluff catchers: how to call down with a medium-strength hand
A bluff catcher beats bluffs but loses to value, so the call comes from the opponent's value-to-bluff ratio and your pot odds, not your hand strength.
- Strategy6 min read
Double barrel bluffing: firing the turn after a flop c-bet
A double barrel is a second bluff on the turn after your flop c-bet gets called. Learn which turn cards to fire, which to give up on, and how to stay balanced.
- Fundamentals6 min read
How poker solvers work: from game trees to GTO
A plain-language look inside a poker solver: the game tree, how counterfactual regret minimisation converges on a Nash equilibrium, and how to study the output.
- Fundamentals3 min read
Equity realisation: why your hand wins less than its raw equity
Raw equity is how often your hand would win at showdown if every hand went there. Equity realisation is how much of that you actually collect once betting, folding, and position get involved.
- Fundamentals3 min read
Why position matters in poker
Position is who acts last on each postflop street. Acting last gives you information, pot control, and more profitable bluffs, which is why the same hand is worth more on the button than in the blinds.
- Strategy4 min read
Stack-to-pot ratio (SPR): the number that sets your plan
SPR is the effective stack divided by the pot at the start of a street. It tells you how committed you are, which hands want to play big pots, and when getting all in is automatic.
- Strategy4 min read
Value-to-bluff ratio: how to balance your bets
The value-to-bluff ratio is how many value hands you bet for every bluff. The correct mix comes from your bet size, and getting it right makes you impossible to exploit by folding or calling.
- Fundamentals4 min read
Expected value (EV): the only number that matters
Expected value is the average result of a decision if you made it many times. Poker rewards the highest-EV play on every street, even when a single hand goes badly.
- Fundamentals4 min read
Implied odds: the chips you win after you hit
Implied odds are the extra money you expect to win on later streets when your draw completes. They let you call with hands that raw pot odds alone would tell you to fold.
- Strategy4 min read
Fold equity: the half of a bluff that does the work
Fold equity is the value you gain from the chance your opponent folds. It is why betting beats checking with many hands, and why a draw plus fold equity can be a profitable raise.
- Fundamentals4 min read
Counting combos: how to put a hand on a range
Combinatorics is just counting the exact card combinations a hand can have. It turns vague reads into numbers, so you can compare value hands and bluffs and make better calls.
- Fundamentals4 min read
GTO vs exploitative poker: which should you study?
GTO gives you an unexploitable baseline; exploitative play deviates from it to punish specific mistakes. Here is what each one actually promises, when each wins more, and how to study both without getting lost.
- Strategy4 min read
How to play 3-bet pots
A 3-bet pot is bigger, more polarised, and lower in stack-to-pot ratio than a single-raised pot, which changes how you build ranges and play the flop. Here is the structure of both seats.
- Strategy4 min read
Poker bet sizing: why solvers bet small, big, and everything between
Bet size is a strategic choice, not a habit. Here is why solvers fire small c-bets on some boards, overbet on others, and how to pick one workable size when you do not have a solver at the table.
- Fundamentals4 min read
Minimum defence frequency (MDF): how often you have to call
MDF is the share of your range you must continue with so a bettor cannot profit by bluffing any two cards. Here is the formula, a worked example, and where it stops applying in real games.
- Strategy4 min read
What are blockers in poker?
A blocker is a card in your hand that reduces the combinations of strong hands your opponent can hold. Here is how blockers shape your bluffs, your value bets, and your river decisions.
- Strategy4 min read
Polarised vs linear ranges
A polarised range is strong hands and bluffs with little in between; a linear range is your best hands in order with no bluffs. Knowing which one you hold tells you how to size your bets.
- Fundamentals4 min read
Range advantage: who the board favours and why
Range advantage is whose set of possible hands the board helps more. It decides who bets, how often, and how big. Here is how to read it, and how it differs from holding the nuts.
- Strategy4 min read
Does GTO work at low stakes?
GTO works at any stake, but it is rarely the fastest way to win at low stakes. Here is what a solid baseline actually buys you against weaker fields, and where exploiting beats it.
- Fundamentals3 min read
How to read a mixed strategy
GTO outputs often say "bet 60 percent, check 40 percent". This is what that means, why solvers mix, and how to pick a clean action for a specific hand without losing the lesson.
- Strategy4 min read
C-betting by flop texture: the principles behind the numbers
Why the same hero range fires a big continuation bet on Ace-high flops and almost gives up on middling connected ones. A practical map of textures to c-bet strategy.
- Strategy4 min read
Why the big blind defends so wide
The BB calls vastly more hands than most players expect against a late open. Here is the price, the structure of the calling range, and what it means for the postflop fight.
- Fundamentals3 min read
What GTO poker actually means (and how to use it)
A plain-language explanation of game theory optimal poker: what a solver really tells you, why it mixes its actions, and how to study it without a math degree.
- Using the site3 min read
From a phone photo to a GTO answer: how the analyzer works
Walk through how jarvispoker turns a photo of a hand into a read on the right action, what it can and cannot see, and how to give it the context that makes the answer accurate.
- Fundamentals4 min read
Pot odds and equity: the only math you need at the table
How to work out whether a call is profitable using pot odds and equity, the rule of 2 and 4 for counting outs, and how to make the whole thing fast.
- Strategy3 min read
Preflop ranges by position: why your seat decides your hands
Why the same hand is a raise from the button and a fold under the gun, how position changes which hands are profitable, and how to use a range chart.
- Strategy3 min read
Study, do not play: how to review hands and actually improve
A practical routine for reviewing poker hands away from the table, why off-table study is the only safe way to use solver tools, and how to turn review into real winrate.
The tools are live. Run a hand through the photo analyzer, study a preflop chart, or work a pot-odds problem.