Aart's Blog

About once a week, I get an email from a user who claims that Chess for Android makes an illegal move with the pawn or king. Invariably the user is not familiar with en-passant or castling. Therefore, I decided to post a brief summary of these rules. In the en-passant capture (click for more details), a pawn that just moved two squares can be taken by an opposing pawn as if it only moved one. To perform this move in Chess for Android simply move the pawn as if making the capture, as illustrated below. The castling move (again, click for more details) involves the king and one of the rooks. The king moves two squares to the left or right while the rook jumps over the king to the adjacent square. The move is only allowed if neither piece has moved before, the path between the pieces is clear, and the king is not in check or crosses a square where it would be in check. To perform castling in Chess for Android, simply move the king two squares to the left or right, as illustrated below.

I just posted version 2.1.1 of Chess, Checkers, and Reversi for Android at the Android Market that allows starting a new game or undoing the last played human move while the computer is thinking. In the older versions, this could only happen during the human player's turn. The latest releases remove that unnecessary restriction. As before, keep in mind that each undo takes back only one half-move (ply). This means that each undo effectively switches the side-to-move. Either use "Switch Side" or make your move on the board to start the engine again.

Although many users seem to like the new full screen, some users really want to see the status bar at all times. Therefore, I just released versions of all my Android games that give the choice between hiding or showing the status bar (in both cases, the screen is still used more efficiently than in the older versions). This is how a screen without status bar looks. To enable the toolbar, press the menu button and select "Options". Then de-select the "Full Screen" option to get the status bar back.

The new release of Chess for Android gives a choice in board style and chess piece sets (others may be added later). To change, press the menu button, which will give you the following screen. Then, select "Options", which will show you the following choices. To switch from a wooden board to a more classic board, de-select the "Wooden Board" button. The piece set can be changed similarly. After this, the chess board has a completely different appearance, as illustrated below. Checkers for Android supports the same choice in board styles.

I just posted v2.0 of Chess, Checkers, and Reversi for Android at the Android Market with the following improvements: => Small, normal, and large screen size support. => Full screen board layout. => On screen buttons moved to menu. => Unified trackball cursor. => More levels of strength. In addition, chess has been improved with: => Choice of two chess piece sets. => Rotating board.