# Fitch Cheney — A mathematical card trick

> A mathematical card trick app based on the Pigeonhole Principle. (iPhone/iPad app by Joachim Neumann.)

- Source: https://appshunter.io/ios/app/fitch-cheney/id1563542091 (this page in markdown: same URL + `.md`)
- Developer: [Joachim Neumann](https://appshunter.io/developer/741515887)
- Category: Games, Education, Card
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 14.0 · 2 MB
- Languages: English
- Released: 2021-04-17
- Data updated: 2026-06-22
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/fitch-cheney/id1563542091/reviews.md

## What is Fitch Cheney?

Inspired by the YouTube video "The Pigeon Hole Principle: 7 gorgeous proofs" by Burkard Polster (Mathologer): https://www.youtube.com/watch?v=TCZ3YwbcDaw

Explaining PDF: https://web.northeastern.edu/seigen/11Magic/FitchCheneyFiveCardCount/Fitch%20Cheney%27s%20Five%20Card%20Trick%20-%20Colm%20Mulcahy.pdf

How to use
The order of the cards for the ranking is 2, 3, 4, ... A and diamonds, hearts, spades, clubs.

In the iOS Settings app, you can scroll to Fitch Cheney and adjust (a) the language of the only word (card) and the position of the key card between 1 and 4

## Key features

- Mathematical card trick
- Pigeonhole Principle explanation
- Customizable card language
- Adjustable key card position
- Educational game


## Frequently asked questions about Fitch Cheney

### What is Fitch Cheney?

Fitch Cheney is a mobile application that demonstrates a mathematical card trick inspired by the Pigeonhole Principle. It allows users to interact with the trick and customize certain elements.

### How does the card ranking work in Fitch Cheney?

The card ranking order in Fitch Cheney is 2, 3, 4, and so on, up to Ace. Suits are ranked as diamonds, hearts, spades, and clubs.

### Can I change the language in Fitch Cheney?

Yes, you can adjust the language of the single word (card) used in the trick within the iOS Settings app under Fitch Cheney.

### What is the key card position in Fitch Cheney?

The position of the key card can be adjusted between 1 and 4 through the iOS Settings app for Fitch Cheney, allowing for a personalized gameplay experience.

### Is Fitch Cheney available on Android devices?

Based on the provided data, Fitch Cheney is currently only supported on iOS devices, specifically iPhone and iPod.

### What is the age rating for Fitch Cheney?

Fitch Cheney has an age rating of 4+, making it suitable for young children and general audiences.

### When was Fitch Cheney last updated?

Fitch Cheney was last updated on April 18, 2021, with version 1.0.

### What is the user rating for Fitch Cheney?

Fitch Cheney has received an excellent rating of 5.0 stars from 1 rating, indicating high user satisfaction.

## Version history (last 1 release)

### 1.0 — 2021-04-18

No release notes.

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## More apps by Joachim Neumann

- [Medical Device Directive](https://appshunter.io/ios/app/medical-device-directive/id741515884)
- [Bitcoin White Paper](https://appshunter.io/ios/app/bitcoin-white-paper/id846183017)
- [Better Calculator](https://appshunter.io/ios/app/better-calculator/id1118056690)
- [Truth-O-Meter](https://appshunter.io/ios/app/truth-o-meter/id1449410151)
- [Translate Numbers](https://appshunter.io/ios/app/translate-numbers/id6473901593)

All apps by Joachim Neumann: https://appshunter.io/developer/741515887

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-22.*