Reference
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In addition to the report ChessBase also generates an Opening Reference for the
variation you are studying.
3.6.7
Openings classification
Openings classification in ChessBase refers to the identification of the openings
variation in the openings key.
This is how it works:
The program plays through each game backwards and compares every position it
encounters with all the positions contained in the classification positions of the
openings key. As soon as a match is encountered it knows under which key it must
classify the game. The reason for playing through the game backwards is that we are
interested in the deepest position, i.e. the one that identifies the most detailed
variation.
When you install a new key (Tools – Classification) in the list window or click the
Openings tab) all the games of the database are classified into the key in the same
way.
ChessBase 2014