The One2Six Advantage-Play Project, Part 2: Reconstructing the Machine from Manuals and Patents

What the public evidence tells us, what remains uncertain, and what needs to stay configurable

Part 1 set out the question that started this project: whether the physical process inside a continuous shuffler could leave behind information that ordinary card counting does not capture. Before I could test that idea, I needed some idea of what the One2Six was actually doing.

From the player’s seat, the machine is effectively a black box. Cards enter, cards emerge, and the interesting part happens behind an opaque cover while the dealer continues the game. The internal process is hidden from view, although it is not completely absent from the public record. The operating manual describes the production device and the procedures used around it. Product material describes its intended capabilities. Patent documents explain the mechanical family from which it emerged, and a later patent application explicitly connects the commercial ONE2SIX to two earlier CARD compartment-shuffler patents.

This provided enough information to begin a serious reconstruction, although the evidence does not support a single exact digital replica of the production machine. The practical objective for Part 2 was therefore to identify a plausible family of mechanisms, preserve the features that are strongly supported and leave the unresolved choices open.

Somewhere in the process, I realised I had spent a Saturday night comparing patent descriptions of card rollers, carousel compartments and ejection arms. The project was proceeding normally.

The Evidence Problem

The main public sources answer different questions and carry different evidentiary weight.

The production-facing user manual is the strongest source for the way the One2Six is operated. It describes game modes, the front shoe, the internal wheel, inventory procedures, card-count verification, jam handling and the recommended timing for returning discards.

The product brochure provides the manufacturer’s description of the machine’s capabilities, including single-deck and multi-deck operation, gravity feeding, continuous card delivery and card-quantity verification. It is useful for establishing broad functionality, although marketing material naturally contains less mechanical detail than the patents.

The patents provide far more information about rollers, sensors, compartments, wheel movement and card ejection. They also describe alternative embodiments and optional features because a patent is intended to protect an invention broadly. A mechanism appearing in a patent cannot automatically be treated as a confirmed feature of every production One2Six.

The later patent trail greatly strengthens the connection. US Patent Application 2015/0196834 identifies the ONE2SIX as a compartment shuffler developed by Casino Austria Research & Development, or CARD, and states that it is disclosed in US Patents 6,659,460 and 6,889,979. It also summarises a mechanism in which cards are fed individually from a feeder into compartments within a carousel.

That link makes the earlier patents directly relevant to the reconstruction, while still leaving room for production differences.

For this project, I have grouped the evidence into four categories:

Category	Meaning
Production-confirmed	Directly supported by the One2Six user manual or product material
Patent-supported	Described in patents explicitly connected to the One2Six mechanism family
Modelling assumption	An implementation choice required because the public evidence is incomplete
Unknown	A parameter or behaviour that remains unresolved and should be exposed rather than silently invented

The categories are mainly a safeguard against assumptions gradually becoming facts through repetition. Once a plausible number or mechanism has appeared in several notes, it becomes surprisingly easy to remember it as something the manual actually said.

What the Production Material Confirms

The One2Six supports both single-deck and multi-deck operation. The user manual describes different front sections for different game types, including single-deck stud-poker operation, single-deck blackjack and multi-deck blackjack using four, five or six decks. Product material similarly describes the machine as a continuous single-deck and multi-deck shuffler capable of handling up to six decks.

The relevant configuration for this project is six-deck blackjack.

The product material also refers to gravity card feeding, continuous multi-deck delivery, card-quantity verification and continuous shuffling of four, five or six decks. These claims establish the broad role of the machine: cards are accepted during play, processed internally and supplied continuously through a shoe-type output.

The manual provides details that are more useful for reconstructing the internal state. It repeatedly refers to a front shoe from which the dealer removes cards, along with a black wheel, compartments within that wheel and procedures for cards jammed while entering or leaving it.

The inventory procedure is particularly informative. Following a jam, the manual states that the machine will deliver cards to the front shoe until all remaining wheel compartments have been emptied once. This indicates that cards can remain distributed across several compartments and that the machine can deliberately cycle through them as part of its inventory process.

At any moment, different physical cards may therefore occupy different locations within the machine. Their future availability depends partly on where they are in that process.

The Broad Physical Path

Taken together, the production material and the connected patent family support the following high-level card path:

discarded cards
    -> input reservoir
    -> card separation and feed rollers
    -> individual card detection
    -> internal wheel or carousel compartment
    -> compartment storage
    -> output mechanism
    -> front shoe
    -> dealer

This sequence forms the basis of the reconstruction. The machine continuously moves cards through several internal states while other cards are being played, collected and returned.

The output may consequently depend on more than the ranks and suits currently inside the machine. Potentially relevant state includes the location of each physical card, the time at which it entered the feeder, the compartment that received it, the number of cards stored alongside it, the timing of that compartment’s release, the cards already waiting in the front shoe and the point at which the dealer returns the latest discard batch.

Part 2 cannot establish how strongly those dependencies affect the output. It can establish whether the proposed dependencies are mechanically plausible and therefore worth representing in a model.

Input: Cards Are Fed Individually

The patents connected to the One2Six describe cards moving from an input stack into the internal storage mechanism one at a time.

US Patent 6,889,979 describes a narrow draw-in zone approximately equal to the thickness of one card, with each card detected as it passes into the machine. The controller records the compartment that received the card and increments the count stored for that compartment.

US Patent 6,659,460 describes an input reservoir, rollers, a line sensor and mechanical levers that complete the insertion of each card into a compartment. The later patent application summarises the One2Six mechanism more directly by describing cards fed individually from a feeder into carousel compartments to create random ordering.

Individual feeding is therefore one of the stronger features of the reconstruction.

The exact order in which a returned discard batch enters the carousel is less certain. The feeder necessarily processes a physical stack in some order, but the public sources do not provide a complete production specification for stack orientation, dealer insertion convention or the order seen by the first roller.

Any implementation should preserve the existence of an ordered input while allowing the feeder convention to be changed. Reversing or preserving the collected discard order may later prove unimportant, but fixing the choice silently would make that impossible to test.

Internal Storage: A Rotating Wheel with Compartments

The compartment wheel is the clearest common feature across the public sources.

The One2Six manual refers directly to the black wheel and its compartments. US Patent 6,659,460 describes a rotatable drum with radially arranged compartments, while US Patent 6,889,979 describes a movable storage device containing compartments and includes embodiments where those compartments are arranged around a rotating drum.

The patents also support multiple cards occupying the same compartment. US Patent 6,659,460 describes compartments capable of holding several cards and gives an example involving a stack of up to nine. US Patent 6,889,979 expressly describes cards being fed into compartments such that more than one card may reside in at least one compartment.

The broad conclusion is that cards are distributed among multiple compartments inside a rotating storage mechanism, with individual compartments capable of holding several cards.

The production manual does not specify the number of compartments. A figure of 38 appears in later patent material for a described carousel embodiment, which makes it a reasonable working value for an initial model, but it cannot be treated as a confirmed production parameter. The same applies to compartment capacity. The patent family establishes multi-card storage and supplies examples without defining one universal capacity for every machine or configuration.

Both values therefore need to remain configurable.

How Randomness Enters the Mechanism

The patent family describes closely related approaches to changing the order of the cards.

US Patent 6,659,460 describes the drum motor being triggered through a randomiser, with movement possible in opposite directions. US Patent 6,889,979 describes randomly rotating the drum or randomly selecting a compartment to receive the next card.

At a high level, both methods separate the order in which cards enter from the order in which they later leave. The physical wheel moves, or a compartment is selected under electronic control, before the next card is inserted.

The public evidence does not reveal the production selection algorithm in enough detail to reproduce it. The unknowns include the random-number generator, whether every compartment is equally likely, whether selection responds to current occupancy, how full compartments are handled, whether some compartments can become temporarily ineligible and whether the production firmware combines wheel movement with a separate compartment-selection rule.

For an initial reconstruction, random compartment placement is a useful abstraction. The selection rule should remain replaceable so that later experiments can distinguish effects created by the general compartment mechanism from effects dependent on one particular allocation policy.

Output: Compartments Feed a Front Shoe

The user manual confirms that the dealer draws cards from a front shoe. The patent family describes mechanisms capable of moving cards from internal compartments into an output receiver.

US Patent 6,659,460 describes arms and rollers pushing the contents of a selected compartment into the output section. It also allows different output attachments, including one that exposes cards individually and another intended for retrieving cards in stacks.

For blackjack, the relevant receiver is the one-by-one front shoe. Cards may arrive in that shoe as a group while still being removed individually by the dealer.

US Patent 6,889,979 describes an embodiment where the ejector removes every card from a selected compartment as one group. Because the controller maintains a count for each compartment, it can subtract the number of cards released when the ejection occurs.

These sources support a working individual-in, group-out hypothesis:

cards enter the wheel individually
    -> several cards accumulate in a compartment
    -> a compartment is selected for output
    -> its contents are ejected into the front shoe
    -> the dealer removes cards one at a time

Whole-compartment ejection has strong support within the patent family, although the patents also allow alternative embodiments in which cards can be removed individually without emptying the entire compartment. A first model can use whole-compartment ejection as its primary case while keeping the output rule configurable.

Why Group Output May Matter

Individual input followed by group output could preserve local relationships between cards even when the long-run frequencies remain correct.

Cards sharing a compartment become temporarily associated through their storage location. Their order within the compartment, the number of cards released together and the timing of the release may all affect the short-horizon output. Cards from one discard batch could land together, their local order could be preserved or reversed, and recently returned cards could remain delayed until their compartment becomes eligible for output.

The output shoe introduces another possible source of separation because compartment-sized groups may join cards that were already waiting there. The resulting stream could have correct overall rank and suit frequencies while still differing from an IID sequence over short intervals.

The existence of such a mechanism would not by itself provide a player advantage. The later simulation would need to determine whether any association survives long enough to affect deals that can be observed and acted upon.

The Front Shoe Is a Separate State

The dealer does not appear to draw directly from the compartment selected at that instant. Cards move into a front shoe, and the dealer removes them from there one at a time.

This adds another layer of latency. A recently returned card must pass through the feeder, enter a compartment, remain there until release and then join the cards already waiting in the front shoe. The latest discard batch may therefore have no influence on the cards immediately ready to be dealt.

Product material describes a smart delivery system intended to maintain a continuous card supply. Service-related terminology visible in public material also refers to output-free and output-refill sensing, which is consistent with the machine replenishing the front shoe automatically as its contents fall.

The strongest public sources do not establish the front shoe’s capacity or refill thresholds. Advantage-play discussions contain estimates ranging from roughly 11 cards to more than 20, although those observations conflict and may have been made under different machine states or settings.

The reconstruction can safely assume that the front shoe has finite depth and some form of refill logic. Its precise capacity and thresholds remain parameters.

What the Machine Knows About the Cards

The production material clearly supports card counting and quantity verification. The manual describes the detection of missing or excess cards and maintenance of an inventory for the selected game. US Patent 6,889,979 describes detecting cards entering and leaving the compartments, maintaining counts for individual compartments and calculating how many cards remain within the machine.

US Patent 6,659,460 describes a line sensor capable of recognising card symbols and includes claims concerning the recognition of card identities. This establishes a patent-supported capability, although it does not show how the production One2Six uses that capability during ordinary blackjack operation.

The commercial material emphasises quantity verification rather than rank-aware sorting, and the ability to recognise a card says little by itself about whether rank or suit affects compartment placement. An initial model can therefore assume that the machine tracks occupancy and quantities while selecting compartments without reference to card value.

Rank-aware alternatives would require stronger production evidence before becoming part of the primary reconstruction.

Discard Timing Forms Part of the Process

The One2Six manual instructs dealers to insert the discards after every hand to obtain optimal statistical card distribution. Cards held on the table or in the discard rack remain outside the machine and are consequently absent from the population available for internal storage and future output.

Blackjack procedure also gives the returned batch an order. Busted hands may be collected immediately, while surviving player hands remain on the layout until settlement. Player boxes are collected in sequence, followed by the dealer’s cards. The resulting discard stack is created by the structure of the game rather than by random sampling from the cards on the table.

The machine therefore receives an ordered physical batch generated by the previous round. If the feeder, compartments and output stages erase that order rapidly, collection procedure will have little effect. If part of the structure survives, the procedure becomes relevant to the card-generating process.

This interaction means that the One2Six cannot be studied entirely in isolation. Any eventual simulation needs enough blackjack logic to determine when cards leave play, how they are collected and when the completed discard batch is returned.

The Working Reconstruction

The public evidence supports the following mechanism as the primary working reconstruction:

1. The dealer collects played cards into an ordered discard batch.
2. The batch is placed into the machine’s input area.
3. Rollers separate the cards and feed them individually past one or more sensors.
4. The controller moves the wheel or selects a compartment.
5. Each card is inserted into the selected compartment.
6. Several cards may accumulate within the same compartment.
7. When the front shoe requires cards, the machine selects an eligible compartment.
8. The selected compartment’s contents are moved into the front shoe.
9. The dealer draws cards individually from the front of the shoe.
10. Played cards remain outside the machine until the table’s discard procedure returns them.

This is the most detailed mechanism I can justify from the available sources without silently resolving the remaining uncertainties.

Parameter	Current status
Number of decks	Six for the target blackjack configuration
Number of wheel compartments	Unknown
Compartment capacity	Unknown, although multi-card storage is supported
Compartment-selection algorithm	Unknown
Handling of a full compartment	Unknown
Order within a compartment	Unknown
Whole-compartment ejection	Strong patent-supported working model
Front-shoe capacity	Unknown
Front-shoe refill threshold	Unknown
Dealer discard timing	Must be represented from game procedure
Rank and suit recognition	Patent-supported capability, production use unresolved

The unresolved parameters are central to the design because they define a family of plausible machines rather than one asserted replica.

Building a Family of Plausible Machines

The features with the strongest support can remain stable across the initial models: individual card feeding, a rotating compartment wheel, multi-card storage, electronically controlled placement, card-count inventory, output into a front shoe and delayed return of played cards.

The uncertain choices can then be varied through sensitivity testing. An initial investigation might ask what changes when the wheel has 32, 38 or 48 compartments, when compartment capacity is increased or reduced, when cards leave in first-in-first-out or last-in-first-out order, when the front shoe contains 12 cards rather than 20, or when the output mechanism releases complete compartments rather than partial groups.

A result tied to one convenient configuration would carry little weight. A pattern surviving across a wide range of plausible mechanisms would be more interesting, even before the exact production settings were known.

This approach also allows the evidence to improve over time. If a stronger source later establishes a particular compartment count, feeder convention or output depth, the plausible family can narrow without requiring the entire model to be rebuilt around a previously hidden assumption.

What Part 2 Establishes

The public evidence supports modelling the One2Six as a stateful compartment-wheel system. Cards enter individually through a feeder and are distributed among internal compartments under electronic control. Several cards may occupy one compartment, and patent-supported embodiments release compartment contents toward a front shoe before the dealer removes cards individually. The machine tracks card quantities, while table procedure controls when played cards return.

That mechanism gives every physical card a location and a path back toward the dealer. Those locations may create short-lived dependencies through storage, group release, front-shoe depth and discard timing.

The strength and duration of any mechanical memory remain open questions. Part 3 moves from reconstruction to experimental design by defining the blackjack environment, card-source interface and comparison processes required to measure what this family of mechanisms produces.

References

• CARD one2six User Manual, 10 February 2005. Production-facing source for game modes, front sections, multi-deck operation, the front shoe, wheel compartments, card-count verification, jams and inventory procedure.
• Shuffle Master one2six Product Brochure. Product material describing single-deck and multi-deck operation, gravity card feeding, continuous delivery and card-quantity verification.
• US Patent 6,659,460 B2: Card Shuffling Device. Describes the CARD rotating drum, radial compartments, input rollers, card sensing, multi-card compartment storage and interchangeable output receivers.
• US Patent 6,889,979 B2: Card Shuffler. Describes individual card feeding, per-compartment inventory, randomised wheel or compartment selection and whole-compartment group ejection in a described embodiment.
• US Patent Application 2015/0196834 A1: Automatic Card Shuffler with Pivotal Card Weight and Divider Gate. Explicitly identifies the ONE2SIX as the CARD compartment shuffler disclosed in US 6,659,460 and US 6,889,979 and summarises individual feeding into carousel compartments.