The Diagramkit v2 figurines have been created by Peter Wong (http://virtualpieces.net/):

 My thanks also to:

• all the engine developers;
• Camillo Toselli, who introduced me to computer chess and supplied a lot of material and contributed with testing and suggestions;
• Mauro Pagani, for his enthusiastic support;
• my father, who explained to me the beauty of chess;
• my wife and my son, for their support and patience.