Manual de Fritz 15 2015 | Page 102

102 3.3.2 Fritz 15 Help The book window In the initial phase of a game the program plays out of an “openings book”. This can consist of millions of openings positions, and for each of these the program has full information on which moves were played, how often, and with what results. The program stores its own experience with openings variations it has played. It learns from success and defeat. See also LiveBook ... You can consult the openings book by clicking on the Ope nings book tab at the top of the notation window (if an openings book is not loaded, click the button and select one from your hard disk). Extended Book Display .... This is what you see in the openings book tree: Moves: (Tree icon) Sometimes a move will appear in grey, which means that it was never played, but leads to a position that results from some other line. N: (N) The header displays the total number of games which led to the current board position. The N column displays the number of games in which each move was executed. %: Percentage score achieved by the move, always from the point of view of the colour to play. If the number of games is low, the percentage is given in grey because it does not have great statistical significance. © ChessBase 2015