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Any books to recommend for this opening?
There is a VERY old one by IM John Watson. I guess the analysis in it is obsolete.
I want a book that has up to date analysis :/
I don't think there is any, at least advocating white's hand. The gambit is currently not popular- black has found effective ways to deal with.
To my knowledge, Yermo's "The Road to Chess Improvement" has some analysed games on it, but not a complete analysis of the whole variation.
If you want something rather sound and rather offbeat to try as white, then 5.e4 b5 6.Qc2!? is interesting.
I would like to play it as black.
As Black... hummm, any decent monograph on the Slav (Vigorito, Lakdawala, some others) suggest a good repertoire against it. Even old books on the Slav are quite adequate, as there have been no major trends in the Geller Gambit for the last eight years or so.
I'd rather say if you don't have any Slav book yet, to wait a bit and buy the two- volume "Complete Slav" by Sakaev, which will be out (the first volume only) after a couple of months or so. Happily for you, the first volume deals with the Geller Gambit.
I'd recommend not bothering with opening theory at all till you have a rating of 1900+ at chess.com, or 1750+ at USCF.
Study tactics, strategy and endgames. You don't need any opening theory right now- the simple opening principles are enough.