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The most important thing to learn about playing blackjack, and I can not stress this was created by using a computer simulation of millions of blackjack hands. strategy to have any hope of being a consistent winner at the blackjack tables.


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Poker, & How to Play Blackjack by Learning the Rules, Hands, Tables, Chips, Blackjack. Table! After pumping dollars into the slot machine and staring at a.


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With the exception of Poker, Blackjack is the most popular gambling card game. signal for a card by scratching the table with a finger or two in a motion toward When a blackjack occurs for the dealer, of course, the hand is over, and the.


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(At most tables the dealer also hits on a "soft" 17, i.e. a hand containing an ace and one or more other cards totaling six.) You are betting that you have a better.


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hands given in the Hit/Stand Table above. As another example, suppose you're dealt Ace–6 and the dealer shows a 5. Check the Soft Hands table to verify that.


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To find strategy tables for a particular casino, you can visit BlackJack Info, a site that The goal of blackjack is to beat the dealer's hand without going over


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This simulation is between the dealer's hand and yours. you will be able to make better decisions when playing blackjack on β€œstiff” hands: TABLE #1 Ratios on.


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(At most tables the dealer also hits on a "soft" 17, i.e. a hand containing an ace and one or more other cards totaling six.) You are betting that you have a better.


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Knowing that, the best possible strategy is the one that minimizes losses. The goal is to find a strategy that is the very best possible, resulting in maximized winnings over time. First, testing with only 5, or 10, hands is not sufficient. The process of finding good candidates for crossover is called selection, and there are a number of ways to do it. But how many hands is enough? As it turns out, you need to play a lot of hands with a strategy to determine its quality. Back in the s, a mathematician named Edward O. The hard hands in particular the table on the left are almost exactly correct. One of the unusual aspects to working with a GA is that it has so many settings that need to be configured. The best way to settle on values for these settings is simply to experiment. The tall table on the left is for hard hands , the table in the upper right is for soft hands , and the table in the lower right is for pairs. Even though we may not know the optimal solution to a problem, we do have a way to measure potential solutions against each other. Each candidate has a fitness score that indicates how good it is. The idea of a fitness function is simple. The flat white line along the top of the chart is the fitness score for the known, optimal baseline strategy. In the case of a Blackjack strategy, the fitness score is pretty straightforward: if you play N hands of Blackjack using the strategy, how much money do you have when done? The soft hand and pairs tables are getting more refined:. The first thing to notice is that the two smallest populations having only and candidates respectively, shown in blue and orange performed the worst of all sizes. There are a couple of observations from the chart. A genetic algorithm GA uses principles from evolution to solve problems. A higher fitness score for a strategy merely means it lost less money than others might have. In fact, it looks like a minimum of , hands is probably reasonable, because that is the point at which the variability starts to flatten out. If, by luck, there are a couple of candidates that have fitness scores far higher than the others, they may be disproportionately selected, which reduces genetic diversity. Could we run with , or more hands per test? One of the cool things about GAs is simply watching them evolve a solution. The source code for the software that produced these images is open source. The more hands played, the smaller the variations will be. There will be large swings in fitness scores reported for the same strategy at these levels. We solve this by dividing the standard deviation by the average fitness score for each of the test values the number of hands played, that is. The solution is to use Ranked Selection , which works by sorting the candidates by fitness, then giving the worst candidate a score of 1, the next worse a score of 2, and so forth, all the way up to the best candidate, which receives a score equal to the population size. One of the problems with that selection method is that sometimes certain candidates will have such a small fitness score that they never get selected. Imagine a pie chart with three wedges of size 1, 2, and 5. That gives us something called the coefficient of variation , which can be compared to other test values, regardless of the number of hands played. Reinforcement learning uses rewards-based concepts, improving over time. Population Size. The three tables represent a complete strategy for playing Blackjack. The other hints of quality in the strategy are the hard 11 and hard 10 holdings. Of course. By generation 33, things are starting to become clear:. Knowing the optimal solution to a problem like this is actually very helpful. With only 12 generations experience, the most successful strategies are those that Stand with a hard 20, 19, 18, and possibly That part of the strategy develops first because it happens so often and it has a fairly unambiguous result. By measuring the standard deviation of the set of scores we get a sense of how much variability we have across the set for a test of N hands. Standard deviation is scaled to the underlying data. But that improvement is definitely a case of diminishing returns: the number of tests had to be increased 5x just to get half the variability. Using a single strategy, multiple tests are run, resulting in a set of fitness scores. In fact, the coefficient of variation for , hands is 0. The lack of genetic diversity in those small populations results in poor final fitness scores, along with a slower process of finding a solution. The following items can be configured for a run:. Given those findings, the fitness function for a strategy will need to play at least , hands of Blackjack, using the following rules common in real-world casinos :. There are a number of different selection techniques to control how much a selection is driven by fitness score vs. As impressive as the resulting strategy is, we need to put it into context by thinking about the scope of the problem. One simple approach is called Tournament Selection , and it works by picking N random candidates from the population and using the one with the best fitness score. During that run, about , strategies were evaluated. Due to the house edge, all strategies will lose money, which means all fitness scores will be negative. Once an effective fitness function is created, the next decision when using a GA is how to do selection. Varying each of these gives different results. Comparing the results from a GA to the known solution will demonstrate how effective the technique is. Clearly, having a large enough population to ensure genetic diversity is important. Roulette Wheel Selection selects candidates proportionate to their fitness scores. Basic concepts get developed first with GAs, with the details coming in later generations.

One of the great things about machine blackjack hands table is that there are so many different approaches to solving problems.

The variations from run to run for the same strategy will reveal more info much variability there is, which is driven in part by the number of hands tested.

That evolutionary process is driven by comparing candidate solutions. This is the very best solution based on fitness score from candidates in generation 0 the first, random generation :.

And then the final generations are used to refine the strategies. A cell in the child is populated by choosing the corresponding cell from one of the two parents. The pairs and soft hand tables develop last because those hands happen so infrequently. That optimal strategy looks something like this:.

Running on a standard desktop computer, it took about 75 minutes. Genetic algorithms are essentially driven by fitness functions.

Oftentimes, crossover is done proportional to the relative fitness scores, so one parent could end up contributing many more table cells than the other if they had a significantly better fitness score. Because of the innate randomness of a deck of cards, many hands need to be played so the randomness evens out across the candidates.

The chart here that demonstrates how the variability shrinks as we play blackjack hands table hands:. To avoid that problem, genetic algorithms sometimes use mutation the introduction of completely new genetic material to boost genetic diversity, although larger initial populations also help.

Here are two other approaches:. Since blackjack hands table parents were selected with an eye to fitness, the goal is to pass on the successful elements from both parents. The X axis of this chart is the generation number with a maximum ofand the Y axis is the average fitness score per generation.

Once this fitness score adjustment is complete, Roulette Wheel selection is used.

Populations that are too small or too homogenous always perform worse than bigger and more diverse populations. Using such a strategy allows a player to stretch a bankroll as far as possible while hoping for a run of short-term good luck. Once two parents are selected, they are crossed over to form a child. The fitness function reflects the relative fitness levels of the candidates passed to it, so the scores can effectively be used for selection. This works just like regular sexual reproduction β€” genetic material from both parents are combined. As you might imagine, Blackjack has been studied by mathematicians and computer scientists for a long, long time. To use the tables, a player would first determine if they have a pair, soft hand or hard hand, then look in the appropriate table using the row corresponding to their hand holding, and the column corresponding to the dealer upcard. That means that if the same GA code is run twice in a row, two different results will be returned. Of course, in reality there is no winning strategy for Blackjack β€” the rules are set up so the house always has an edge. It works by using a population of potential solutions to a problem, repeatedly selecting and breeding the most successful candidates until the ultimate solution emerges after a number of generations. That score is calculated once per generation for all candidates, and can be used to compare them to each other. If you play long enough, you will lose money. A pair is self-explanatory, and a hard hand is basically everything else, reduced to a total hand value. Finally, the best solution found over generations:. It reduces variability and increases the accuracy of the fitness function. The first generation is populated with completely random solutions. Tournament selection has already been covered. By generation 12, some things are starting to take shape:. The columns along the tops of the three tables are for the dealer upcard, which influences strategy. Neural networks are great for finding patterns in data, resulting in predictive capabilities that are truly impressive.