The Viewer can handle a special type of database of chess games. These databases can include information about all the positions that occur in all the games. That facility allows powerful searches by position. If the position you search for is included in the database, you will get full statistical information about it, for instance, the exact number of games won, lost or drawn. Furthermore, you can view all the games where that position was reached and follow all the moves till the end of those games.
The database uses a propietaty format, generated from a standard PGN file by a special application, called VisorBDD. Besides building the whole database, this application can also generate the positions for a previously built database for which the full positions were not registered. A 100.000 game database contains in the order of 6 million different positions using about 600 MB disk space. This size can be reduced to only 60 MB if the information about each position is not included, even cut by half compressing the file to a ZIP format. So if you plan to transfer a database through Internet, you can do it without the positions and once downloaded, generate locally the positions with the VisorBDD application in a process that normally takes between 3 and 4 hours.
High quality database with games played among players with an Elo of 2700 or more more (includes positions.) Download
Database with games played among players with an Elo of 2600 or more more (does not include the positions.) Download
Database with games played among player with an Elo of 2500 or more more (does not include the positions.) Download
All the above files are compressed into RAR format.
To use a games database, it is necessary to register it first by the button "Options" located in the upper toolbar of the viewer. You have to select the tab "Books." In the upper part of the window you can register the opening books and in the lower part the games databases. The ID field allows you to enter a short sentence to describe the database. Then you should press the button ,
located under the ID identifier, to search for a file with ".ind" extension that emerged from uncompressing the downloaded database. Finally, press on the "Registration" button.
The opening books and the databases share the ".ind" extension, but they are not interchangeable, if you register one in the wrong place erros will occur when using the viewer.
You have access to the databases from the Blackboard, or from the main screen. From the blackboard you can look for a position. Pressing the button from the upper toolbar, a new windows opens up:
From which the games can be selected applying a search criteria based on the name of the players, their Elos plus other useful information. You can also search by the position currently in the board of the main window. If when looking for a position, there is data introduced in the criteria fields, all options will be combined and applied to the search criteria.
If you search by "Criteria" and at least a single game in the database fulfils it, a list of games resulting from the search will be shown in the main window of the viewer, substituting any other previous list.
If you search by "Position" and a match is found, the result will be shown in a new window:
The statistical data (games won, lost, drawn, etc) refer to all the games in the database that contain the search position, even though they result from a combined search by a criteria of data, that not all these games fulfil. The statistics of the games that, besides matching the search position, match the data criteria too, are shown when the button Moves is pressed.
The field "Year" contains the average year where all the games matching the search position were played. The "Success" field is an average of the results obtained in the games where that position occured, giving a biggest weight to the most recent games.
If the button "Move" is pressed, a list with all the moves that have been played is shown, from this exact position, with the result statistic to each one of them.
The move annotated as "----" represents the games that ended exactly in search position, without further moves been played afterwards.
The button "Games " will create a list of games that will be shown in the viewer, with the games that went with one, several, or all of the moves. Before pressing the button "Games" it is necessary to mark, in the list shown on the screen, the rows whose games you want to extract and at least one row has to be marked.
Below the moves list, there is a dropdown list that allows to select the calculation module to be used in the analysis. When you press the "Analyse" button, the selected calculation module will evaluate each one of the moves in the list:
And after considering all the moves that have been played, the engine will consider all the remaining legal moves in that particular position, that have never been played, showing the best from them, that is to say the "Best novelty" in the position.
If you press the "Copy" button all the information will be copied to the clipboard, in PGN format. For instance, from the data shown in the previous image, the following information is generated:
The clipboard content can be copied to a word processing application to keep it as a file, or it can be imported by the viewer using the button of the toolbar in the main window of the application.
Games database.
located in the upper toolbar of the viewer. You have to select the tab "Books." In the upper part of the window you can register the opening books and in the lower part the games databases. The ID field allows you to enter a short sentence to describe the database. Then you should press the button 
,
located under the ID identifier, to search for a file with ".ind" extension that emerged from uncompressing the downloaded database. Finally, press on the "Registration" button. 
from the upper toolbar, a new windows opens up: 
of the toolbar in the main window of the application.