Matching Pennies 4+

Natural Computation LLC

Designed for iPad

    • 1.0 • 1 Rating
    • Free



Matching Pennies is the two-weapon equivalent of the more widely known Rock, Paper, Scissors game. Any successful strategy in such a game is some form of pattern recognition, which is a highly developed topic, since it is a fundamental component of both data compression and machine learning. This makes a large set of standard strategies available to players by adapting well-established pattern recognition techniques. The App is designed to help you learn such techniques, and have fun doing so!

You can learn by playing against the computer, after selecting a standard strategy for the computer to use. You can experiment with the relative strengths of different strategies by playing computer versus computer, with a different strategy selected for each side. The App contains elaborate help documentation that describes the standard strategies, with particular emphasis on helping you learn Prediction by Partial Matching, which is one of the most useful pattern recognition techniques.

Most importantly, the App allows you to play against human opponents by connecting your mobile devices over Wi-Fi, so you can apply what you have learned. You can control the level of difficulty by setting the number of rounds per game to be any odd number between 1 and 99. The requirement that it be an odd number leverages an advantage that Matching Pennies has over Rock, Paper, Scissors. There is no possibility of a tie in a game with an odd number of rounds. This makes it a better method for settling disagreements with your friends!

You can speed up games with a large number of rounds, and make them more challenging, by setting a time limit per round. When connected to other players, the time remaining in a round is synchronized among all devices, in order to enforce the time limit fairly.

There are four advanced features that make the game even more interesting and challenging:

Team Play - allows multiple players to mutually connect over Wi-Fi, and form two teams that play against each other.

Strategy Assist - provides additional features in the user interface that help you follow the Prediction by Partial Matching strategy.

Strategy Builder - allows you to create new computer strategies that are variations on the standard strategies. This increases the experimentation you can do to help you form your own unique strategy.

Wagering - allows you to express confidence in your moves by associating a wager with each move, which is a number from 1 to 10. Scoring is adjusted so that a higher wager means a higher reward if you win a round, and a higher penalty if you lose.

Mesh networking by

What’s New

Version 1.1.7

Upgraded to Xcode 13.

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

Algae rocks ,

What are the odds?

Every game I play I always every turn is heads I never get tails, game after game. Please fix for a better review

Developer Response ,

Tap the circle once for heads (H) or twice for tails (T). Click the Ready button to reveal your opponent's move. The new version (1.1.4) adds a Welcome pop-up message with this information and a link to the Getting Started section of the Help documentation, which describes this and other features in detail. Thanks for your feedback!

App Privacy

The developer, Natural Computation LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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