During the game the program offers the user support in the form of graphic displays on the chess board. The last move played by the program is displayed on the board using a yellow arrow.

 

The app offers further help when the user "touches" a piece, in other words marks a piece and keeps hold of it by keeping the mouse key pressed. The various squares the piece can be moved to are displayed in various colours.

 

 

In the diagram the Nc3 has been selected for the next move.

 

The orange squares indicate a fairly bad move, green/yellow squares represent possible good moves. Real blunders are marked in red.