Atlassino Academy · Other tables · Lesson 11

Siete y medio: seven and a half against the bank

Siete y medio is played with forty cards against the bank, under the rule book of the Buenos Aires Province. Here are the cards, the bank’s fixed rule, the three kinds of seven and a half, and what each choice costs.

  • About 14 minutes
  • Illustrated hosts: Leo and Maya
  • Last checked 25 October 2026

You hold a 4, the bank’s card is face down, and everyone at the table seems to know what to do next. Is there a right answer?

The short answer

Yes, and it is printed on the cloth. Siete y medio is played with forty cards against the bank, and the bank has to draw on 4½ or less and stand on 5 or more. By our count, the choice that costs you least is the same line, with one addition: two picture cards as your first two are opened into two hands. Played that way, a bet costs 2.57% of itself on average; standing on your first card every time costs 26.42%.

Leo, in the dealer's place beside the bank's face-down card, holds the next card ready while Maya weighs her single face-up card, five cups of a Spanish-suited deck, beside one chip.
Leo smiling, explaining with an open hand.

Leoformer dealer · rules and maths

Siete y medio looks like a quiet cousin of blackjack, but it has its own deck, its own half points and its own three kinds of seven and a half. Everything on this page comes from one rule book, and every number from one count.

Forty cards, one aim

The game uses French cards without the eights, nines and tens, and the aim is a total of seven and a half, or as close to it as you can get without going over; the player plays to get closer than the dealer. The shoe holds ten decks of forty, four hundred cards.

What each card countsA deck of forty: the eights, nines and tens are taken out.
CardCounts
Ace1
2 to 7Its number
Jack, queen, king½

A picture card is half a point, so totals go up in halves: ½, 1, 1½ and so on to 7½.

Each player plays the bank alone, not the other players: how much to bet and whether to take another card are each player’s own choice.

One deal, from the bets to the payout

The dealer gives every player one card face up and takes one face down for the bank. The bank’s card is turned over only after the last player has stood or gone over; if every player has gone over, the bank turns over only its first card.

  1. Bets

    Every seated player bets on every deal, inside the table’s minimum and maximum.

  2. One card each

    Each player gets one card face up; the bank takes one face down.

  3. Your choices

    Stand, or draw one card at a time, until you stand or go over 7½.

  4. The bank

    Turns its card over and draws or stands by its fixed rule.

  5. Paid

    Each box is settled against the bank on its own.

You may stand on any total from your first card, or draw one card at a time until you choose to stop or go over, but never draw on seven and a half. A box that goes over is lost at once, before the bank plays. Every seated player bets on every deal, or gives up the seat.

The bank’s rule

The bank has no choices. It has to draw on 4½ or less and stand on any total from 5 to 7½, and the line is printed on the cloth. Over a fresh shoe, by our count, the bank goes over 7½ on 26.42% of deals, ends on seven and a half on 6.75%, and stands on exactly 5 on 19.97%.

Leo pointing at the table with an open hand.

Leoformer dealer · rules and maths

The bank’s line is also the line that costs you least. In our count, every total from ½ to 4½ is cheaper drawn than stood on, and every total from 5 up is cheaper stood on. You do not need a chart: read the cloth.

Three kinds of seven and a half

Seven and a half comes in three kinds. Siete y medio real, a seven and a picture card of the same suit, loses to nothing. Siete y medio mayor, a seven and a picture card of different suits, loses only to real. Siete y medio menor, made with three cards or more, loses to real and to mayor.

Three kinds of seven and a halfWhat a bet with each one is paid, and what it loses to.
KindMade withPaid on a bet of 10 unitsLoses to
RealA seven and a picture card of the same suit20 unitsNothing
MayorA seven and a picture card of different suits15 unitsReal
MenorThree cards or more10 unitsReal and mayor

Every other paid bet gets 100% of itself; real gets 200% and mayor 150%. A box with the same total as the bank neither gains nor loses, and you may take the bet back, except at seven and a half. When both sides make seven and a half, the player is paid 50% of the bet: 5 units on 10 units.

We read the 50% as the case of two sevens and a half of the same kind, as the table printed in the rule book says; when the kinds differ, the higher kind decides, as the three rules above say.

Opening two picture cards

When your first card is a picture card and your second is another, you may play a second bet the size of the first on each of them, and draw on each as you like without going over seven and a half. Only one such opening is allowed per box, and a seven and a half made on an opened hand is paid like any other.

By our count it is the one choice in the game that departs from the bank’s line, and it is worth taking: two picture cards opened come to +8.78% of the first bet on average, against −18.79% for drawing to 1 and −47.14% for standing.

What a bet costs

The rule book prints the payouts, not a price. The table below is our own count: every way a fresh shoe of 400 cards can deal one box against the bank, with the bank playing by its rule and each way of playing priced by the payouts above.

What a bet costs, by how you playOur own count over a fresh shoe of 400 cards, one player at the table, as a share of the bet.
How you playCost of the bet, on average
Draw on 4½ or less, stand on 5 or more, and open two picture cards2.57%
The same line, but never open two picture cards5.04%
Stand on your first card, every time26.42%

Two things make the price. Your box is settled first: when you go over, the bet is lost even on the deals where the bank would go over too. Against that, real and mayor are paid more than 100%, and two picture cards can be opened. Playing the bank’s line and opening the pictures, a bet costs 2.57%; skipping the opening costs 2.47% more of every bet.

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

Mayaformer floor supervisor · manners, money and breaks

Playing the cheapest line does not make the bet cheap: it still costs something every deal, and a seat at this table means a bet on every deal. Decide the money and the time at home, and leave the seat when either runs out.

If you find yourself staying to get back what is gone, 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

Betting from behind a seated player

Players standing behind the table may bet on any seated player’s box, and the two bets together may not pass the table maximum. The choices belong to the seated player alone. Nobody may advise a seated player about their choices while the game is on, or comment on them.

If the seated player opens two picture cards and you do not put up a second bet, your bet plays the first card only.

Practice: draw or stand, pay the box

Level 1 shows your cards while the bank’s card is face down and asks what costs less. Level 2 shows both hands and asks what your bet of 10 units is paid. The 10 units is an example bet, 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.

The bank’s card is face down. What costs you less?

  • Draw a card Drawing on 1 costs more: −18.79% of the bet on average, against +8.78%.
  • Stand Standing on 1 costs more: −47.14% of the bet on average, against +8.78%.
  • Open them into two hands Two picture cards can be opened into two hands, each with a bet the size of the first. That comes to +8.78% of the first bet on average, against −18.79% for drawing to 1.

By our count over a fresh shoe, the right choice depends on your total alone: draw on 4½ or less, stand on 5 or more, the same line the bank has to follow. The one exception is two picture cards as your first two: open them into two hands.

What is paid on your bet of 10 units?

  • The bet is lost Siete y medio menor loses to siete y medio mayor.
  • Nothing: the bet stays where it is Not here. Siete y medio menor loses to siete y medio mayor.
  • 10 units paid Not here. Siete y medio menor loses to siete y medio mayor.

Over 7½ loses at once. Seven and a half is paid by its kind: real 200%, mayor 150%, menor 100%; the same kind on both sides is paid 50%. Any other paid bet gets 100%, and an equal total below 7½ leaves the bet where it is.

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: draw or stand by the same count our engine uses for the prices above, and every payout by the rules of the Buenos Aires Province rule book. The wrong answers are named mistakes: standing low out of caution, drawing on a total the bank would stand on, an equal total taken for a loss, and two kinds of seven and a half taken for one.

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

Four 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 stand on 6. The bank turns over a 2 and a 4, and stands. What is paid on your bet of 10 units?

Show the answer

Answer: Nothing: the bet stays where it is, and you may take it back. An equal total is a standoff, unless it is seven and a half.

  • The bet is lost: the bank holds the tie An equal total below seven and a half is not lost: the bet neither gains nor loses.
  • Nothing: the bet stays where it is, and you may take it back Boxes with the same total as the bank, except for seven and a half, neither gain nor lose.
  • 10 units A bet is paid only when its total is closer to seven and a half than the bank’s, or the bank goes over.
2Your seven and jack are both spades. The bank ends on a three-card seven and a half. What is paid on your bet of 10 units?

Show the answer

Answer: 20 units. Real is the one seven and a half nothing stands above.

  • 5 units Half is paid when both sides have seven and a half of the same kind; here the kinds differ.
  • 20 units A seven and a picture card of the same suit is siete y medio real: it loses to nothing and is paid 200%.
  • The bet is lost Siete y medio real loses to no total at all.
3Your first two cards are a queen and a king. What does the rule book let you do that it lets you do with no other pair of cards?

Show the answer

Answer: Open them into two hands, with a second bet the size of the first. Two picture cards are the one hand that can become two.

  • Take the bet back before drawing Once the first card is dealt to the first player, the deal has begun; bets come back only on an equal total.
  • Ask the bank to draw first The bank turns its card over only after the last player has stood or gone over.
  • Open them into two hands, with a second bet the size of the first That is the “apertura de figuras”, one per box.
4You are standing behind a seated player and have a bet on that box. The seated player stands on 3. What can you do? new situation

Show the answer

Answer: Nothing: your bet follows the seated player’s choices, and nobody may advise them. The box belongs to the seated player.

  • Nothing: your bet follows the seated player’s choices, and nobody may advise them A standing bettor bets on a seated player’s box and may not decide or advise.
  • Ask for a card for your own bet Decisions on the game belong to the seated player alone.
  • Tell the seated player to draw Nobody may advise the seated player about their decisions during the game.

Back to the question we opened with. Yes: on a 4 you draw, as the bank would. The bank’s line is printed on the cloth, and in our count it is also the cheapest line for you, with two picture cards opened as the one exception.

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. Everything on this page follows chapters 17 and 18 of resolution 1452/12 of the Buenos Aires Province lottery and casino institute, the rules of siete y medio and the technical rules of the table. We found no other province’s rules for the game, and nothing here says how a table elsewhere is run.

Numbers. Every payout comes from the percentages of the rule book, applied by our siete y medio engine. Every price and share is counted exactly over a fresh shoe of 400 cards: every way the cards can fall for one box and the bank, with the bank drawing by its rule. Nothing here is typed in by hand.

What the count leaves out. The count is for one player at the table; the cards other players take are left out. For the bank’s seven and picture card, the count takes the same suit as one chance in four. A split is counted as two hands, each played from the shoe without the other picture card; that the second hand draws from the same shoe as the first is left out. No document we could read prints how many deals an hour a table plays, so there is no price of an hour here.

Our readings. The rule book pays 50% when “the bank and a player” both make seven and a half; read with its own table (“of equal value”) and the order of the three kinds, we take it as the case of the same kind on both sides. A box that goes over is lost at once, as the bank turns over only its first card when every player has gone over.

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. Siete y medio is played against a price. Playing the cheapest line lowers what each bet costs on average; nothing on this page changes which cards come out of the shoe, and nothing here says how an evening at the table would end.

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