View > Book
The Book Window shows the book moves of the current position in the game.
The title bar shows the name of the book.
At the top left is 'N=', which shows the number of games in which the position has occurred..
To the right of it is the winning percentage of the position.
Move
Actual moves played are black and bold. Sometimes a move is gray. A gray move is never played, but leads to a position that results from some other line (tranpositions). Sometimes a move is black but not bold: this is the last move played (retro moves).
Games
Shows the number of games with the position after the move is executed.
Percentage
Shows the percentage score of the position after the move is executed. The percentage is always from the point of view of the color to play. To calculate the percentage, half the number of draws are added to the won games.
Statistics
The columns Games+, Games=, Games-, Percentage+, Percentage= and Percentage- split up the move in the number of won games, the number of lost games and the number of draws.
Pieces and Squares
The columns Pieces, Men, Kings and Squares show the number of captured pieces, the number of captured men, the number of captured kings, and the squares of the captured pieces.
Status Bar
The status bar shows the number of moves, the number of retro moves and the number or transpositions. In the fourth section the number of positions in the book is displayed.
When you double-click a move, or press Enter, it is added to the notation of the game. You can use arrow-up and arrow-down to select a move.