The major part of the material on which the Sicilian Dragon Powerbook 2020 is based comes from the engine room of playchess.com: 160 000 games. There have been added another 12500 games from Mega and from correspondence chess.
Sicilian Dragon Powerbase 2020 is a database and contains 4997 top class games from Mega 2021 and the Correspondence Database 2020, of which 730 are annotated.
