ChessBase

Ruy Lopez Powerbase 2023 is a database and contains a total of 10947 games from Mega 2023 and the Correspondence Database 2022, of which 1232 are annotated.

The Ruy Lopez Powerbook 2023 has a tree structure based on 2.71 million computer chess games played in the engine room of playchess.com.

The greater part of the material on which the Sicilian Sveshnikov Powerbook 2023 is based, comes from the engine room in playchess.com: 199 000 games. This imposing number has been supplemented with another 14 000 games from the Mega Database and from cor

Sicilian Sveshnikov Powerbase 2023 is a database and contains a total of 8553 games from Mega 2023 or the Correspondence Database 2022, of which 578 are annotated.

Powerbook based on more than 508 000 games in which White already sidesteps the main variations of the Sicilian on move 2.

2nd Move Anti-Sicilian Powerbase 2023 is a database and contains a total of 10131 games from Mega 2023 or the Correspondence Database 2022, of which 847 are annotated.

Most of the material on which the Sicilian Accelerated Dragon Powerbook 2022 is based comes from the engine room of playchess.com: 81,000 games with the ECO codes B34-B39. In addition, there are 10,000 games from the Mega database and from correspondence

Sicilian Accelerated Dragon Powerbase 2022 is a database and contains 4156 high-class games from the Mega 2022 or Correspondence Database 2020, 410 of which are annotated.

Sicilian Dragon Powerbase 2022 is a database and contains 5490 high-class games from the Mega 2023 or Correspondence Database 2020, of which 736 are annotated.

The major part of the material on which the Sicilian Dragon Powerbook 2022 is based comes from the engine room of playchess.com: 161 000 games. There have been added another 14000 games from Mega and from correspondence chess.

The Powerbook Unusual Lines 2022 is based on more than 700,000 games of the ECO codes A00-A09, i.e. it deals with all opening beginnings other than 1.e4, 1.d4 as well as 1.c4.

Unusual Lines Powerbase 2022 is a database and contains a total of 6826 games from the Mega 2022 or the Correspondence Database 2022, of which 738 are annotated.

The main part of the material on which the French Powerbook 2022 is based comes from the playchess.com engine room: 655,000 games. An impressive number to which 87,000 games from correspondence chess and the Mega were added.

The French Defence Powerbase 2022 is a database and contains 10275 games from the Mega 2022 and the Correspondence Database 2022, 659 of which are annotated.

Most of the material on which the Sicilian Paulsen Powerbook 2022 is based comes from the engine room of Schach.de: 426,000 games. In addition to this impressive amount, there are 43,000 games from the Mega and from correspondence chess.