The Big Bird PowerBase - 3rd Edition A huge database of over 76,000 games with 701 main annotated games. More than 1,200 further games with medals, critical marks, evaluations, etc. Detailed opening key with nearly 2,200 classification positions. 5 theme keys and clean indexes and text documents - even H.E. Bird essays and photos. To be used with ChessBase 6.0 + or Fritz 6 & higher.