With this track record, I had some trepidation before purchasing an ebook version of Nigel Davies, Play the Catalan ($19.99) for viewing within the iPad Chess Viewer ($1.99). The three samples provided with the app revealed that viewing games and commentary was functional, although complex variations are not particularly well supported by the Chess Viewer app. It is easier to navigate complex variations in Chess Base, the viewer of choice for Everyman Chess ebooks.
Play the Catalan is less expensive in paperback ($18.96 at Amazon), but weighs more than the iPad, which also contains many hundreds of other books (and currently sixteen chess programs). The advantages of purchasing it in this format include the convenience of the iPad itself, and that acquiring it does not require finding more space on already overcrowded book cases.
Everyman's website lists 125 ebooks, but only 30 appear in the store accessible via Chess Viewer. All these books concern openings, while their list of ebooks available for viewing in Chess Base includes a handful that are not opening manuals, including Jose Capablanca, Chess Fundamentals (algebraic edition).
It seems as though they rushed Chess Viewer through the process without considering the features that might be of interest to readers. Even so, it is a good beginning.
The Introduction in Play the Catalan includes two complete games: Kasparov - Korchnoi 1983, 7th match game, and a game not available in the Chess Base online database, Davies - Brown, 2009. This position stems from the latter.
White to move
Here Davies found a simple winning combination.
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