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This brain training game of strategy, conceived by George W. Robertson for playing on a desktop computer, was originally known as Digital Checkers. It was developed over a two year period with the assistance of his son Glenn and adapted for iOS devices by Laurie Davis.

AppStore

CheX is available on the AppStore (click on the logo to the left). It is a universal app that will work on any iOS device - iPod touch, iPhone or iPad.

Objective

To earn more points than your opponent.

How to Play

turn indicator

The first player to play is randomly chosen when a new game is started. The next player to play is always indicated by the color of the tokens at the top left and bottom right corners of the board.

Tokens are played either by dragging them onto the board, or by tapping one of the tokens and then tapping the chosen cell. Once a token is played (your finger is removed from the board), the play is complete and changes cannot be made.

The game is over when no more plays are possible.

Rules

valid play

There can only be one token for each number in any row or column. For example, only a 5 can be played on cell B1 since 1, 2 & 3 have been played in row 1, and 4 has been played in column B.

block

Cells are automatically blocked if a valid play is not possible. For example, no token can be played on cell B1 since 1, 2 & 3 have been played in row 1, and 4 & 5 have been played in column B.

Scoring

The number on each token indicates its value. Players accumulate points for each row and column based on the tokens played in that row or column. There is no score for a row or column if any of the cells in that row or column are blocked. A row or column score in yellow indicates a 'potential' score - the row or column is not yet full, so the points could be lost if a cell is blocked. Potential scores are not included in the total scores.

A bonus of 5 points is awarded to the player placing the last token in a row or column. There is no bonus awarded if any of the cells in the row or column are blocked.

The total scores for each player are shown in the top right and bottom left corners of the board.

Automated Opponent

If you select 'Automated Opponent' when you press the 'Player' button you can play a game against the computer. The first player to play, and the color of the players are randomly chosen when a new game is started.

Game Center Opponent

If you select 'Game Center Opponent' when you press the 'Player' button you can play a game against a remote player using Game Center. The first player to play is the player initiating the game. The color of the players are randomly chosen when a new game is started. Tap the 'Game' button to show the Game Center views.

Hints

In a game against an automated or Game Center opponent, if it is your turn you can replay the opponents last move by tapping on the opponent's token area.

A two finger swipe (up or down) will switch opponents (board, automated or Game Center).

Tap on the CheX logo to see some statistics on the games that you have played.

Support

If you have any problems or questions, send an email to CheX Support.