ChessBase

The Pirc Defence Powerbook 2019 (including the Modern Defence) consists for a greater part of engine games (160 000), to which has been added high value material from Mega and the Correspondence Database (46 000).

Pirc Defence Powerbase 2019 is a database and contains a total of 8423 games from Mega 2019 or the Correspondence Database 2018; of these 709 are annotated.

The Queen's Indian Powerbook 2019 has a tree structure which is based on a mixture of over 350 000 complete chess games played in the Engine room of playchess.com and the best games played by humans (50 000).

Queen's Indian Powerbase 2019 is a database and contains 9048 high level games from Mega 2019 and the Correspondence Database 2018, of which 593 are annotated.

The major part of the material on which the Sicilian Kalashnikov Powerbook 2019 is based comes from the engine room of playchess.com: approximately 18 000 games. To these have been added another 4500 games from the Mega database and from correspondence ch

Sicilian Kalashnikov Powerbase 2019 is a database which contains a total of 2724 games from Mega 2019 or the Correspondence Database 2018, of which 157 are annotated.

Sicilian Sveshnikov Powerbase 2019 is a database and contains a total of 8023 games from Mega 2019 or the Correspondence Database 2018, of which 548 are annotated.

The Colle-Zukertort Powerbook 2019 contains mainly engine games (53.500) and high-level material from the Mega and the Correspondence Database (4.500).

The Colle-Zukertort Powerbase 2019 is a database and contains 4703 games from the Mega 2019 and the Correspondence Database 2018, 75 of which are annotated.

The Torre Attack Powerbook 2019 is based on a mix of 37,000 computer games and 13,000 games from the Mega database and the Correspondence Database.

The Torre Attack Powerbase 2019 is a database and contains 6370 games from the Mega 2019 and the Correspondence Database 2018. 280 games are annotated.

The Italian Game Powerbase 2019 is a database and contains a total of 9357 games from Mega 2019 or the Correspondence Database 2018, of which 330 are annotated.

For the King’s Indian Powerbook it was above all high value material which was used: 99 000 games from the Mega database and from correspondence chess, with in addition over 252 000 games from the engine room on playchess.com.

The King’s Indian Powerbase 2019 is a database and contains a total of 9780 games from Mega 2019 or the Correspondence Database 2018, of which 754 are annotated.

English Opening Powerbase 2019 is a database and contains a total of 9652 games from 2019 and the Correspondence Database 2018, of which 582 are annotated.