N is the number of games where this move was played
% is the measure of games not lost using this move
Av & Perf are the elo ratings of the move in the games and in theory.
What do you mean by in theory? I can imagine how the average elo ratings are calculated for the actual games, but what is the theory?
Yes, what is theory?
Oh yeah, and what is Fact, Prob, and [%]?
Are you sure about the "%" symbol? I'm not too sure that it means a win/draw for the player that opens with it...
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those numbers are chess notations....
Anonymous131,
the answer could be found in the HELP file that is on the top line in fritz.
(( I'm glad to know: there is at least one other user here who is almost as lazy as I am. 
))
I checked before, or else I wouldn't bother to ask on the forumn. Here's what comes up:
The moves in green are those that Fritz will play against you. It will play !! and ! more often, and will never play ?, ?!, or ??
So... Is the opening the computer plays based off of the theoretical rating?
Bump
Book settings
Menu: Tools – Book settings (or press F4)
Use book determines whether the openings book will be used.
Tournament book instructs the program not to play moves that have been excluded from tournament play. If the option is off, the moves might sometimes be played.
Minimum games tells the program how many games must be available for a move for it to be played.
Up to move number determines how long it should be in book.
Variety of play determines which moves will be chosen: only the ones with the highest statistical values, or the seldom moves as well (slider right = varied).
Influence of learn value determines how the learning weights in the tree influence the probability of a move being played (right = maximum).
Learning strength determines how strong the weights are adjusted on the basis of individual games (right = maximum).
Optimize sets the last three parameters to their original values, for optimal playing strength.
Normal is for informal games.
Handicap for games on the handicap levels.
You obviously didn't read the question.
This is the listing of possible moves from the current position (the starting position, clearly) in Fritz's database. The database is simply a collection of many games from strong players.
A move in green is a move that Fritz likes and would play. Other moves (those with a ? suffix) it doesn't like and wouldn't play, although for a human they might be perfectly fine.
The N column lists the number of games in the database that continued with the listed move.
The % column lists the average score for all of the games that continued with this move (100% for a white win, 0% for a black win, 50% for a draw); so 50% means that both white and black probably have equal chances, 55% is a normal white advantage, 30% is very good for black.
The Av (average) column is the average Elo rating of the player to move for each game in the database that continued with the listed move. A higher number indicates that the move is generally played by overall stronger players.
The perf (performance) column is an average of the Elo performance of the player to move in each game (for the listed move). This takes into account both the opponents' ratings and the results, and so can be a better indicator of the actual performance of the move than just the % or Av alone.
As for the Fact, Prob, and [%], I'm not sure (I don't think they're that important), but I think that the Prob is the chance that Fritz will open with that move.
And finally, a quick note on the limitations of databases - in certain positions, especially where there are few games, the database stats can be misleading. If in doubt, it's best to follow the lines all the way through.
You obviously didn't read the question.
wrong:
The best explanation that can be given of the moves the engine chooses to play is found in the help file for book settings, which I pasted for your use.
Your earlier question had already been answered.
You can also look at Steve Lopez's T-Notes for Fritz 6 (the opening book functions and data have remaining consistent since the earlier versions) for some explanation: http://www.chessbase.com/Support/support.asp?pid=86
Hey guys, could you tell me what all ofthese numbers mean?
Thanks.