Book

The book is a database with all positions occurred in all games from the database. For each position the book has full information on which moves were played, how often and with what result. Browsing the book gives you quick insight into the openings played in practice. You can create your own books, for example a book with all games of your next opponent.

Browse

In the book screen you see the moves played (black and bold). The number below N is the games which led to the current board position. The column shows the number of games with the position after the move is executed. The number below % is the percentage score of the current board position. The column 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. The moves are sorted on number of games by default. You can sort the move also on percentage.

Statistic

At the bottom of the book screen you see the statistics. The number of games to the right of the current book move is split up in the number of won games, the number of lost games and the number of draws. The position after 1.33-28 occurred in 54008 games and the percentage score is 45 percent. There are 14114 games won, 18717 lost games and 21177 draws. To calculate the percentage, half the number of draws are added to the white wins and then divided by the number of games.

Play

When you double click a move the move is played. The new position is shown on the board and the book screen is adjusted. The last move played is the retro move and displayed at the bottom of the list. In this example there is only one retro move because we are at the beginning of the game. Later in the game you will see often more than one retro move.

Retro line

Several retro moves are possible. Mostly because of different move order. In this example we played 1.34-30 20-25 2.32-28 25x34 3.39x30. Now you see three retro moves. The current board position arises 6442 times through 39x30. It is not easy to see that 34-30 or 32-28 can be played as the last move. But you can ask the program to show the variation of each retro move.

Replay

If you ask the retro of the move 32-28 the program shows a screen with the board en the retro line. You can replay the line. The line proves that you can reach the position with 32-28 as the last move played. When you swap the moves 3.34-30 and 5.32-28 then 34-30 is the last move played.

Mirror

Several retro moves are possible. Sometimes because of mirror positions. In this example we played 1.32-28 18-22 2.37-32 12-18 3.41-37 7-12 4.46-41 1-7 5.34-29 19-23 6.28x19 14x34. Now you see two retro moves. The current board position arises 2896 times through 14x34 and 243 times through 23x34. It is not easy to see that 23x34 can be played as last move. But you can ask the program to show the variation of each retro move.

Replay

If you ask the retro of the move 23x34 the program shows a screen with the board en the retro line. You can replay the line. The line proves that you can reach the position with 23x34 as the last move played. Changed colors or no problem for the book. A position that also appears with changed colors is stored only once in the book.

Transpositions

The book screen also shows transpositions. A transposition move is a move that was never played, but leads to a position that results from some other line. In this example we played 1.32-28 20-25 2.37-32 15-20. The move 3.31-26 is gray. This is a transposition move. There are 13 games with the position after 3.31-26. But the move 3.31-26 is never played in the current board position.

Create book

The program is shipped with a huge book containing all positions occurred in all games of the database. You can extend the book with new games. You can also create books yourself. For example with all games of Ton Sijbrands playing the white color. When you browse the book you know that the white book moves are played by Ton Sijbrands and the black moves by his opponents (excluding changed colors). This way you can study the white opening repertoire of Sijbrands. You can do the same with all the games of Ton Sijbrands with the black color to study his black opening repertoire.

Flits

Flits can play out of an openings book. How Flits plays depends on the positions in the book. Do you want to play with the white color against Sijbrands? Then make a book with all games of Sijbrands playing with black. Do you want to play with the black color against Sijbrands? Then make a book with all games of Sijbrands playing with white. Do you want to train a specific opening position? Then search all games with this position and make a book with only these games.Do you allow Flits to play all book moves? Then move the slider at Variety of play to the right.'. Or has Flits to play only the most popular move? Then move the slider to the left.