The main part of the material on which the French Powerbook 2021 is based comes from the playchess.com engine room: 637,000 games. An impressive number to which 80,000 games from correspondence chess and the Mega were added.
The French Defence Powerbase 2021 is a database and contains 9839 games from the Mega 2021 and the Correspondence Database 2020, 644 of which are annotated.
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.
