Atlassino Academy · Other tables · Lesson 14

Póker Oasis: the card you buy after the bet

Póker Oasis is five-card poker against the casino, as the national lottery wrote it for Casino Buenos Aires: an Ante, a bet of twice the Ante, one card you may buy only after the bet, and a jackpot bet on the first five cards.

  • About 16 minutes
  • Illustrated hosts: Leo and Maya
  • Last checked 25 October 2026

You hold four spades and a heart, and the bank shows a nine. At this table you may buy a card, but only once you have put in the bet. Is the hand worth voy?

The short answer

Yes, if you then buy the card. By our count, voy and then a card in place of the heart comes to −29.81% of the Ante on average, against −100.00% for paso and −122.36% for voy without the card. In póker Oasis the card is bought after the bet, so a hand that needs a card is worth the bet only because of the card that follows it.

Whose rule book this is. Resolution 85/2010 is a document of Lotería Nacional S.E., the national lottery, approving the rules of this game for the rooms run by Casino Buenos Aires S.A. The national lottery has since been put into liquidation by decree 95 of 2018. A December 2025 bulletin of the Supreme Court summarises a ruling (Fallos 348:179) on the extension of a long-expired gaming contract, an extension that kept the city lottery of Buenos Aires from using its powers; the bulletin does not name a room. So this page reads the rule book as a document of the national lottery for Casino Buenos Aires. It does not say that any table in the city plays by it today.

Maya, with chips in two boxes, slides one of her five cards face down toward Leo, who offers her a new card face down from the dealer's place behind the bank's five cards, the fifth face up.
Leo smiling, explaining with an open hand.

Leoformer dealer · rules and maths

Five cards against the casino’s five, with one card of the bank’s showing. The twist is the order: you commit the bet first, and only then may you pay for a new card. Everything below is from one rule book, and every number is counted from it.

Whose rule book this is

The rules on this page are those of the national lottery’s rule book for “poker con descarte en la variante Oasis”, written for the rooms of Casino Buenos Aires S.A. in Buenos Aires City (CABA). In 2016 the national lottery still named “póker Oasis” among the games whose minimum and maximum bets lie inside a band it sets; each table sets its own limits inside that band.

The status of the document is not simple. The national lottery has been put into liquidation, and a Supreme Court ruling concerns the gaming contract in the city; the note under the short answer gives both with their sources. Read this page as an account of what the rule book says, not as a promise of what a table plays tonight.

Poker against the casino

The rule book calls the game a banked card game in which each player, with five cards, plays against the bank to hold a higher hand than the bank’s. The table is the size of a blackjack table, with up to seven players and one betting box each; the deck has fifty-two cards; players standing round the table may not bet, and every bet is in the casino’s chips.

The ace counts high, and also low in ace-two-three-four-five. Once the cards are dealt, players may not share anything about their hands; doing so voids the hand.

One hand, from the Ante to the payout

To receive cards you put in an Ante, before the deal; the jackpot bet, if you make one, goes in at the same time. Each player gets five cards face down, and the bank gets five, the last one face up.

  1. Ante

    Every seated player puts in the Ante, and, if they like, the jackpot bet.

  2. Five cards

    Five to each player face down; five to the bank, the last one face up.

  3. Voy or paso

    Voy: a bet of exactly twice the Ante. Paso: the Ante is lost.

  4. Buy one?

    Only after voy: one card, for the amount of the Ante.

  5. The bank

    Turns its cards over: it qualifies with an ace and a king, or more.

  6. Paid

    Each hand against the bank on its own; equal hands are a standoff.

Unlike póker mediterráneo (lesson 9.13), four things change your decisions here: the card is bought after the bet, high cards can be paid, equal hands are a standoff, and the side bet is a jackpot judged on the first five cards.

Voy or paso

A player who says paso gives up the Ante. A player who says voy puts in a bet of exactly twice the Ante: 20 units on an Ante of 10 units.

By our count, a pair of twos against a five showing is worth voy: −94.33% of the Ante on average, a smaller loss than the −100.00% of paso. With no pair, the ace and king alone are not: ace, king, seven, nine, three against a five comes to −110.25%. Ace, king, queen, nine, three against a two is just worth it, at −97.67%, because high cards that are higher than the bank’s are paid at this table.

Buying a card, after the bet

Each player may change one card of their choice, at the price of the Ante. The order matters: the dealer asks whether you will bet, and only a player who says voy is then asked whether to buy a card. The new card is the first card of the deck. The bank never changes a card: it plays the five it was dealt.

So the question “is this hand worth voy?” includes the card you might buy after it. You see your five cards and the bank’s one, so 46 cards are unknown to you. Holding four spades and buying in place of the heart, 9 of them make a flush and 12 make a pair. With five, six, seven and eight against a two showing, 8 cards make a straight, and voy with the card comes to −57.76% of the Ante, against −100.00% for paso.

A card is not always worth its price. With a pair of nines against an ace showing, voy and keeping the five comes to +15.37% of the Ante; buying a card in place of the three comes to −27.32%.

The bank’s ace and king

The bank qualifies only if its cards hold at least an ace and a king, or a higher hand. When it does not, each player still in the hand is paid an amount equal to the Ante; the rule book pays the Ante alone. We read the bet as coming back.

Over a full deck, by our count, the bank does not qualify on 43.68% of hands. With the five showing and the pair of twos above, it qualifies on 56.93% of the ways its other four cards can fall.

The pay table, high cards and standoffs

Against a bank that qualifies, a higher hand is paid the bet by the table and the Ante 1 to 1; a lower hand loses everything in its box. The table pays from 1 to 1 for high cards up to 100 to 1 for a royal flush.

What the bet is paid when the bank qualifiesWith an Ante of 10 units, the bet is 20 units; the Ante itself is paid 1 to 1. The last column is how often five cards from a full deck make each hand.
HandPaysOn 20 unitsHow often
Cartas mayores1 to 120 units50.12%
Pareja1 to 120 units42.26%
Doble pareja2 to 140 units4.75%
Trío3 to 160 units2.11%
Escalera4 to 180 units0.39%
Color5 to 1100 units0.20%
Full7 to 1140 units0.14%
Póker20 to 1400 units1 in 4,165
Escalera de color50 to 11,000 units1 in 72,193
Escalera real de color100 to 12,000 units1 in 649,740

High cards count as a hand for the player: with no pair, your cards are compared with the bank’s, highest first, then the next, and so on. The bank qualifies on an ace and a king, so high cards can only be paid when you hold an ace and a king too and your next cards are higher.

A player is paid only with a higher hand, loses with a lower one, and in a standoff keeps the bets without any payment. Equal kinds of hand are separated by the rule book’s own steps: a full house by its three cards, a flush and a straight of any kind by the highest card, two pair by the higher pair, then the other, then the fifth card, a pair by the pair and then the highest of the other cards; the suits rank equal. Where the rule book stops, we count a standoff. That is rare: with the pair of twos against the five, 78 of the 163,185 ways the bank’s cards can fall end that way.

The jackpot bet

Alongside the hand there is a separate, optional bet, the “seguro”, for a special prize: the jackpot. It is judged on your own first five cards only, whatever the croupier holds. You may make it only with an Ante, for one to five credits, and never for more in all than the table minimum. A player who buys a card gives up any right to the jackpot. The list of prizes is posted where the table can see it.

When the jackpot is fixed, the rule book prints its table: 10,000 for a royal flush and 5,000 for a straight flush, both fixed, and from four of a kind down to a straight an amount multiplied by each seguro.

The fixed jackpot table, and how often the first five cards make each handThe amounts are the rule book’s; how often is our exact count over every five-card hand.
First five cardsPaysHow often
Escalera real de color10,000, fixed1 in 649,740
Escalera de color5,000, fixed1 in 72,193
Póker500 for each seguro1 in 4,165
Full100 for each seguro1 in 694
Color50 for each seguro1 in 509
Escalera simple25 for each seguro1 in 255

If each amount is counted in units of one seguro, the fixed table brings back, on average, the share of each seguro below; the rest stays with the bank. That unit is our reading: the table prints the amounts without one.

What one seguro brings back on average, on our reading of the tableCounted in units of one seguro. The two fixed amounts do not grow with the seguros, so each extra seguro brings back less.
Seguros on the handBack for each seguro, on average
154.5%
250.3%
348.9%
448.2%
547.7%

A progressive jackpot pays shares of an amount that starts at no less than 5,000 times its minimum bet and grows with play; its value is on the table’s display, not in the rule book, so this page does not count it.

Maya with a hand on her chest, speaking gently and seriously.

Mayaformer floor supervisor · manners, money and breaks

A hand you play to the end can put four Antes on the table, and the seguro is extra. Decide the money and the time at home, keep what one hand needs in front of you, and leave the seat when either runs out.

If the jackpot starts to feel like the reason to stay, the lines below are there for exactly that.

If it stops being fun

If gambling stops being entertainment, help is available. Minimum entry age: each province sets its own. Where we found the rule or regulator that sets it, we cite it on the page; those we found set it at 18. More on responsible gaming.

Show all provinces
0800-666-6006Buenos Aires City (CABA) · Línea de orientación por juego problemático (LOTBA) · Monday to Friday, 9 to 17
0800-444-4000Buenos Aires Province · Programa de Prevención y Asistencia al Juego Compulsivo (IPLyC)
0800-777-2983Cordoba · Línea 0800-777-AYUDA (Lotería de Córdoba) · 24 hours
0800-268-5640Santa Fe · Línea gratuita de la APRECOD (Santa Fe) · Every day, 8 to 24
0800-888-2202Entre Rios · Departamento Juego Responsable (IAFAS, PREVENJUEGO)
0261-424-7536Mendoza · Programa de Juego Responsable (IPJyC) · Monday to Friday, 8 to 14
0800-888-5836Misiones · Programa de Juego Responsable del IPLyC S.E. (0800-888-LUDO)
0800-888-2008Chaco · Línea de Juego Responsable (Lotería Chaqueña)
0299-403-8900Neuquen · Líneas de contacto, orientación y tratamiento (IJAN, juego responsable) · Monday to Friday, 8 to 15
0800-222-1700Rio Negro · Línea de Orientación al Jugador Problemático (Lotería de Río Negro)
02901-433515Tierra del Fuego · Departamento Juego Responsable (IPRA, Ushuaia)
0800-555-7678Tucuman · Juego Responsable, Ley 8986 (Caja Popular de Ahorros)
0800-999-1314San Juan · Línea gratuita del Programa Provincial de Juego Responsable (Caja de Acción Social) · Monday to Friday, 08 to 12

If you are thinking about suicide, call 135 or 0800 345 1435 from anywhere in the country

Practice: voy or paso, pay the hand

Level 1 shows your five cards and the bank’s one card showing and asks for paso, voy and keep the five, or voy and buy a card. Level 2 shows both hands after voy and asks what your hand gets on balance. The 10 units is an example Ante, not a suggested bet.

Nothing is bet here, and nothing is random. Each question is a set picture of cards, and the answer is worked out from the same rules and the same count as the rest of the page.

The practice table needs JavaScript. Here is one question from it, with the answer.

Paso, voy and keep the five, or voy and buy a card?

  • Paso: lose the Ante, 10 units Not the cheapest. Voy and buying a card in place of the four of hearts costs least here. Paso −100.00%, voy and keep the five −122.36%, voy and buy a card −29.81%, each as a share of the Ante.
  • Voy, put in 20 units, and keep the five Not the cheapest. Voy and buying a card in place of the four of hearts costs least here. Paso −100.00%, voy and keep the five −122.36%, voy and buy a card −29.81%, each as a share of the Ante.
  • Voy, then buy a card for the four of hearts Voy and buying a card in place of the four of hearts costs least here. Paso −100.00%, voy and keep the five −122.36%, voy and buy a card −29.81%, each as a share of the Ante.

Paso costs the Ante. Voy puts in the bet, twice the Ante, and only after that may you buy one card for the amount of the Ante. Each answer here is the cheapest of the three by our count, over every way the bank’s four hidden cards can fall and, for a bought card, every card that can come.

What does your hand get on balance, the Ante and the bet together?

  • 30 units lost Not this one. Both bets are lost only when the bank qualifies and holds the higher hand.
  • 10 units paid Not this one. The Ante alone is paid only when the bank does not qualify.
  • 30 units paid The bank plays on its ace and king, and your cards are higher, card by card: cartas mayores. The Ante is paid 1 to 1 and the bet 1 to 1, 20 units.

The bank plays with an ace and a king or more. When it does not, the Ante is paid 1 to 1 and the bet comes back. When it does, the higher hand is paid the Ante 1 to 1 and the bet by the table, high cards included; the lower hand loses both; equal hands are a standoff and the bets stay where they are.

Every question in the practice run is worked out the same way: the cards are put through the same rules and the same count as the rest of the page, and the answer comes out of that, not out of anybody’s memory.

How the practice run works

Where the questions come from. Every answer is worked out when the page is built: voy and paso by counting every way the bank’s four hidden cards can fall, a bought card by counting every card that can come and then the bank’s cards again, and every payment by the rule book. The wrong answers are named mistakes: buying before the bet, the bank’s ace and king taken for no hand, high cards taken for no hand, the bet paid 1 to 1, and a standoff taken for a loss.

One strip, and no rounds. Every square on the strip is one question of this lesson, and all of the squares are there from the start. Your first answer fills the square it belongs to; when the squares of one level are full, the next level begins by itself. Practising a question you got wrong turns its cross into “fixed in practice” and does not change the count, because only first answers count.

Your progress stays in this browser, and nothing is sent anywhere.

Check yourself

Maya with a finger raised and a knowing look.

Mayaformer floor supervisor · manners, money and breaks

Five quick ones. Pick an answer, then check it. No timer, no points: just whether it stuck.

A question marked “New situation” asks you to use the lesson on a case it did not show.

1You look at your cards and want to change one before deciding. Can you?

Show the answer

Answer: No: only a player who has said voy and put in the bet is asked about buying a card. The dealer asks about a card after the bet.

  • No: only a player who has said voy and put in the bet is asked about buying a card The bet comes first; the card is bought after it, for the amount of the Ante.
  • Yes, and the bank changes a card as well The bank never changes a card: it plays its five.
  • Yes: change first, then decide on voy or paso That is the order of póker mediterráneo. At this table the dealer asks about buying a card only after the bet is in.
2You said voy with ace, king, queen, eight, three. The bank turns over ace, king, jack, nine, four. What happens?

Show the answer

Answer: Your cards are higher card by card, so the Ante is paid 1 to 1 and the bet 1 to 1. High cards are compared card by card, and the table pays them 1 to 1.

  • A standoff: both have an ace and a king High cards are compared one after another until one side is higher.
  • Both bets are lost: a hand with no pair loses to a bank that plays Not at this table: high cards are a hand for the player too.
  • Your cards are higher card by card, so the Ante is paid 1 to 1 and the bet 1 to 1 Both have an ace and a king; your queen is above the bank’s jack. Cartas mayores pay 1 to 1.
3You hold a flush to the king; the bank qualifies with a flush to the king in another suit. Who is paid?

Show the answer

Answer: Nobody: the bets stay where they are. In a standoff you keep your bets and are paid nothing.

  • The bank: ties go to the bank Equal hands keep the bets; they are not the bank’s.
  • You: your second card is higher For a flush, the rule book compares only the highest card.
  • Nobody: the bets stay where they are Two flushes are compared by their highest card. Both are kings, and the rule book compares no further; by our reading, a standoff.
4You put in a seguro for the jackpot, said voy and bought a card that made a flush. What does the seguro get?

Show the answer

Answer: Nothing: buying a card gave up the jackpot, and only the first five cards count for it. The jackpot is judged on the five cards first dealt.

  • The flush prize of the jackpot table The jackpot counts only the first five cards, and buying a card gives the jackpot up.
  • Half the flush prize There is no half prize: buying a card gives up the jackpot entirely.
  • Nothing: buying a card gave up the jackpot, and only the first five cards count for it The seguro is gone with the bought card, whatever the new card makes.
5Before you sit down, what does this table ask you to keep in front of you for each hand you mean to play? new situation

Show the answer

Answer: Up to four times the Ante: the Ante, twice that for the bet, and one more if you buy a card. Voy is twice the Ante, and a card costs one more.

  • Up to four times the Ante: the Ante, twice that for the bet, and one more if you buy a card Ante, bet and a bought card come to four Antes, before any seguro.
  • Whatever the next player bets Each player’s hand is settled on its own against the bank.
  • The Ante only Saying voy needs another twice the Ante, and a bought card one more Ante.

Back to the question we opened with. Yes: say voy, then buy the card. Four spades are worth the bet here because the card comes after it, and without the card the same bet costs more than paso.

Where to go next, and further reading

18+ under each province’s rules · Play responsibly · the helplines are further up this page

Further reading

How it’s worked out

Rules, numbers, sources and hosts

Where the rules come from. Every rule on this page is from resolution 85/2010 of Lotería Nacional S.E., the national lottery, approving the rule book of “poker con descarte en la variante Oasis” for the rooms of Casino Buenos Aires S.A. That lottery has since been put into liquidation by decree 95 of 2018, as a 2018 joint resolution of two ministries records, and a Supreme Court ruling summarised in its December 2025 bulletin (Fallos 348:179) concerns the extension of a long-expired gaming contract in the city. This page therefore reads resolution 85/2010 as a document of the national lottery for Casino Buenos Aires, not as the rule book in force at a room today, and it does not say that any table plays póker Oasis now. The 2016 resolution on minimum and maximum bets is cited only for naming the game.

Numbers. Every voy-or-paso answer is counted exactly: your five cards and the bank’s one card showing against every way the bank’s four hidden cards can fall from the 46 you cannot see. Every bought card is counted the same way for each of the 46 cards that can come, with the bank’s four hidden cards from the 45 left; once the card is bought the bet stays in. Every share of hands is counted over all 2,598,960 five-card hands. Nothing here is typed in by hand.

What the count leaves out. The price of the whole game is not counted: it needs the right choice for every hand, every card the bank shows and every card you could buy, and that count is beyond this page. Each count is for one player at the table; the cards the other players hold are left out. The progressive jackpot pays shares of an amount we cannot know, so it is not counted. No document we could read prints how many hands an hour a table plays, so there is no price of an hour here.

Our readings. Where the rule book stops comparing two equal hands (a flush by its highest card, a pair by the pair and then the highest of the other cards), we count the hands as equal: a standoff. In ace-two-three-four-five the ace counts low, so we take the five as its highest card. When the bank does not qualify, the rule book pays the Ante 1 to 1 and says nothing more of the bet; we read it as returned. The fixed jackpot table gives amounts without a unit; we count them in units of one seguro, the stake of one credit. If a room counts them otherwise, the figures change.

Sources. Every rule on this page carries a button with the sentence it rests on, in the rule book’s own Spanish, the publisher who wrote that sentence and the date we read it.

Hosts. Leo and Maya are illustrated characters. Their backstories, a former dealer and a former floor supervisor, are written for the course: neither is a real person, and neither speaks for any casino. The rules and numbers on this page come from the sources it cites, not from their experience.

No promise. Every hand at this table has a price, and so does every seguro. Knowing when paso is cheaper and when a card pays for itself lowers what you pay; nothing on this page changes which cards are dealt, and nothing here says how an evening at the table would end.

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