Tiger's Modern by Tiger Hillarp Persson is a good one.
There is also a book by Lakdawala in the "Move by Move" series on the Modern defense. I am less familiar with this book, but the series and author are very reliable so I would give this a consider.
Alternatively, if you like chessable there is a course there on the Modern by CM Vjekoslav (I actually beat him on the white side of his beloved modern defence, but regardless, he is a good author)
Tiger's Modern by Tiger Hillarp Persson is a good one.
There is also a book by Lakdawala in the "Move by Move" series on the Modern defense. I am less familiar with this book, but the series and author are very reliable so I would give this a consider.
Alternatively, if you like chessable there is a course there on the Modern by CM Vjekoslav (I actually beat him on the white side of his beloved modern defence, but regardless, he is a good author)
You should get The Modern Tiger instead of Tiger's Modern. The former is an update to the latter. Same author.
The best book is... not a book but a data base.
All books are obsolete while in print, while new games are played while the book is in print.
Tiger's Modern by Tiger Hillarp Persson is a good one.
There is also a book by Lakdawala in the "Move by Move" series on the Modern defense. I am less familiar with this book, but the series and author are very reliable so I would give this a consider.
Alternatively, if you like chessable there is a course there on the Modern by CM Vjekoslav (I actually beat him on the white side of his beloved modern defence, but regardless, he is a good author)
You should get The Modern Tiger instead of Tiger's Modern. The former is an update to the latter. Same author.
also this. thanks for the clarification @thrillerfan
Starting Out The Pirc/Modern by Joe Gallagher is an introduction.....especially good for understanding ideas...
Tiger's book, while a good one, is a repertoire book, covering his preferred variations...
https://www.google.com/books/edition/Starting_Out_The_Pirc_Modern/qn6lDQAAQBAJ?hl=en&gbpv=1&dq=starting+out+the+pirc/modern&printsec=frontcover
https://www.amazon.com/Modern-Tiger-Grandmaster-Guides/dp/1907982833/ref=sr_1_1?crid=3GIEZXSQGK3K2&keywords=the+modern+tiger&qid=1648410069&s=books&sprefix=the+modern+tiger%2Cstripbooks%2C167&sr=1-1
https://www.amazon.com/Starting-Out-Modern-Nigel-Davies/dp/185744566X/ref=sr_1_1?crid=1ILLVUO14VV7J&keywords=starting+out+the+modern&qid=1648412201&s=books&sprefix=starting+out+the+modern%2Cstripbooks%2C132&sr=1-1
https://www.amazon.com/Complete-Guide-Modern-Pirc-Complex/dp/1781944687/ref=sr_1_9?crid=O9QTDQ4C35W7&keywords=modern+defense+chess&qid=1648412028&s=books&sprefix=modern+defen%2Cstripbooks%2C131&sr=1-9
The best book is... not a book but a data base.
All books are obsolete while in print, while new games are played while the book is in print.
Highly doubtful. Between Boris Avrukh’s old Catalan repertoire book and his new one, I remember a line in the kings Indian which he suggested a novelty and “since then it has been tested in one game”. One game.
What is the best book on the Modern Defense? I want to develop a opening repertoire and understand the ideas behind the moves.