What does "this is your last book move" mean in the analysis report?

It means exactly what it says.  It was the last book move played.

"Book moves" are the main line moves in an opening.  When one side does not play a main line move, they are considered being out of book.

"Book moves" are the moves made at the GM level.  They are considered the "best" moves.  But unless you are playing at an elite level, you dont need to worry about making book moves.  What you need to make are good moves that follow opening principles, and gain some understanding of "why" the pieces, and pawns go where to do.

Bruh lol

book move means it is a move from an opening if you want to learn more about openings study opening theory

'Book moves' are the basic textbook 1-2-3, they're neutral moves that are no secret to anyone. 

This article I have linked will provide more information if you are still curious; https://www.chess.com/blog/raync910/what-is-a-book-move

Summary; Book moves = Textbook neutral move, "This is your last book move" = This is the last recorded move by player X that correlates with the book 

Books are some lines that are considered theory. Sometimes though a book line maybe just be a popular line that MAY not be optimal at all. So don't always think it means well, but mostly it does. Hope that helps.

It just means the most common opening theory stopped there. It's not a bad thing, it could just be that your opponent played something out of theory or that you played a different line that was also good. It can be both good or bad.

XackeryTorres wrote:

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A book move is a move that has been played before and that has been recorded is a book.
So your last book move means the game now goes into uncharted territory.

It's the last point at which a game had been played that matches ur game. Ur game had been following a previous game that's in the recorded games and at this move u went ur own way.

Think of it as u being a maverick, a groundbreaker. U created a novelty. 

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Last book move until it’s just you playing with out a specific known strategy.

Oh shoot. I didn’t see the time stamp for this. Sorry if this is a bump.

 pawns go where to do

It means you've past the stage of the well known first few moves of the game

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