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One more note...there was a comment that "Not to mention Emms is a bettr player than Nunn ever was or will be" in a previous review, but that is simply not true. John Nunn hovered around #10-15 in the world during mid-80's, while John Emms has yet to break into top 100.
I admit the publisher's advertising blurb could have been more clear ("Most chess puzzle books put you in an artificial situation: you are told a combination exists, what the theme is, and what you are required to achieve. This one is different") because, as the previous reviewer notes, "all puzzles books put you in artificial positions!" However, presumably the reader of a puzzle book - unless he's been dropped on his head as a child -knows there are combinations in the book.
Nunn clearly writes "one cannot disguise the fact that there is "something" in the position, but I do not see why the challenge should be made even more artificial by giving away further information." The previous reviewer seems to think that Nunn contradicts this statement, breaking "the book's promises," by providing background comments (as well as specific hints in a separate section for the baffled) for the puzzles. However, if you can solve a problem from comments as cryptic as "White has a number of promising attacking continuations, but how can he force immediate resignation?" or "It takes some time to grasp what might be going on in this totally weird position. What should Black play, and what should the result be?" then you should be writing puzzle books, not buying them. Simply ignore the comments and look only at the diagrams if you want no "help."
The previous reviewer writes "Nunn gathered the material for this book from old Informator issues and some of his own games... Do we really need a puzzle book then?" implying that the puzzles were already published and Nunn is simply repackaging them as new and his own. In fact, Nunn writes the puzzles were based on his own unpublished analysis of Informator annotations, along with personal game notes and an analysis of two tournaments (Karlsbad 1911 and 1993 Biel). The previous reviewer basically concludes that finding and solving on one's own the puzzle in any game is best and that "Puzzle books, even good ones like Nunn's, rob the reader of this discovery." Nonsense! Nothing prevents one from analyzing games on one's own - if one so chooses - in the meantime, there are a number of interesting puzzles in John Nunn's Puzzle book.
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Only a dozen pages are devoted to the opening and they are mostly aimed at evaluating chess books on unusual openings. This section can be skipped entirely without much loss.
The middlegame has all of 20 pages dedicated to it, but they do manage to offer some "practical" advice once again. Most of it comes in "blurbs" - little nuggets of advice based on what has worked for a very successful GM.
The rest of the book is devoted to the endgame and although it recounts some well-known ending basics such as opposition, triangulation, and R+P vs R ending, it also contains some very good information that is not nearly so well known. Such includes: Black's ideal defensive pawn formation in a 4v3 pawn ending with all pawns on the same side; why the c pawn offers the best winning chances in a Q+P vs Q ending; and some handy rules for R vs N and R vs B pawnless endings.
On the whole, the book is quite "practical" and probably worth the price to a fair number of club players of lesser strength.
I particularly liked the section on the endgame. I am not about to sit through a 200 page endgame manual and memorize things like "this ending is a win with K on e7 and R at a2 but a draw if the K is on d6; however, if the passed pawn is a RP, then the White K must be on the 3 squares in front of the RP, etc." Nunn gives good basic rules and examples in the endgame which, if you learn, should cover 90 percent of your endgames.
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Extremely dense, but chock full of new ideas.
Prose explanations are rare.
(Indeed,there are hardly any game references, which makes me wonder if the line is from Kasparov-Karpov, one of the games from the authors, computer analysis, or some guys from the local club!)
But it has all the coverage you would expect of a one-volume opening book.
Should this be the only opening book you buy? No. I find it more interesting to compare lines from MCO and NCO rather than blindly accept one book's version as the final one.
But if you were to _only_ buy this book, you would not be disappointed. You would have to be prepared to play through the lines, and attempt to justify the author's evaluations yourself. You won't get much help from them.
Bobby Fischer once remarked to a casual player that to improve, one would first pick up a book (which incidently was Modern Chess Openings) and play the moves and the footnotes at least twice from cover to cover. Although this sounds extreme, the point to note is that before a player can even decide on an opening or what the varied openings are like, it is important to have a good idea of what are the typical and nontypical lines that are played nowadays across all openings. One can gain opening ideas from words (such as Fine's Basic chess openings or even Modern Chess Openings). However, this method only provide a superficial coverage of any opening. A more accurate way is to look precisely at the variations involved in each opening and decide FOR YOURSELF which lines are advantageous or not. Bronstein once remarked that many of the past books on openings that stated equality for black is often an understatement that Black has already gain a substantial advantage - meaning that only YOU can decide whether when you attempt a certain variation: Are you just following the crowd or are you thinking by yourself. No doubt, the workload in preparing for your openings will be heavy. The task then is to narrow these openings into a suitable repertoire for yourself (as a function of your style, endgame preferences, etc).
Of course, it helps if you have a chess teacher to do this for you. If not, you can simply follow Fischer's advice and do what many chessplayers are doing nowadays - teaching yourself to improve.
As I said it is a good book to have if 1) You play tournaments regularly 2) you can find one under 15 bucks. If you just play blitz on ICC or at the local club then this book is of little use to you.
A word of caution opening books are like PC's they get oudated rather quickly, but then again unless you are a Garry or Vishy that should make little difference.