Customise the colour of the pieces

The colour of the pieces of the game is assigned of random form by the program. You can customise the colour of each piece with click (with the left button of the mouse) and press the Shift key. To continuation only does fault that select the colour wished. The program saves this selection automatically.
If you want to delete a personalised colour or change the colour assigned by the program by another colour selected randomly, only have to click on with the mouse right button and press the Shift key.