ChessBase

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 main part of the material on which the French Powerbook 2019 is based comes from the playchess.com engine room: 610,000 games. An impressive number to which 72,000 games from correspondence chess and the Mega were added.

The French Defence Powerbase 2019 is a database and contains 9029 games from the Mega 2019 and the Correspondence Database 2018, 508 of which 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.

For the English Powerbook only high value material above all was used: “Only” 62 000 games from Mega and from correspondence chess. To those were added 472 000 games from the engine room on Playchess.com.

Bird Opening Powerbase 2019 is a database and contains a total of 3558 games from Mega 2019 or the Correspondence Database 2018, 97 of which are annotated.

Good material on the Bird Opening is rare. So the Powerbook on its basis of just 58 000 games is welcome; the majority were played by engines.