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Theory commonly refers to the erudite study and the philosophy behind the moves in chess (like opening or endgame theory) but this tag can also be used for questions about the game theoretic study of the game itself.

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Many times one can read in chess magazines the world "beautiful". Comments like "that move/combination/execution/problem/solution was beautiful" are our daily bread when we read game analysis. What ar …
asked Oct 13 '14 by Pablo S. Ocal
5
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that opening theory is evolving at every top game, as discussed on this question. Thus, making such compilation including new developments is something that I can assure you, it does not exist. What … compilation of certain lines (not all, as this would occupy several Chess Informant monographs) with every move explained. This is not the usual approach to opening theory, and one of the reasons that …
answered Sep 22 '14 by Pablo S. Ocal
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If your assumption is: If a position is a draw and I add new pieces, then the position is still a draw. Then this is certainly false. As a proof, you may have a look at the position: [FEN …
answered Oct 19 '14 by Pablo S. Ocal
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As already said, top GM keep up with the theory by simply looking at the games played. In think the sources provided by @Cleveland are excellent, and just in case you may want to keep up to the games … website 365chess.com more than enough. You only need to get registered to benefit from around 3M games (the Big Database), organised by the popularity of the move made. This is not the latest theory
answered Sep 20 '14 by Pablo S. Ocal
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Against a king pawn opening, one of the most straightforward and aggressive ways to defend is the Scandinavian. If you don't want much theory, I would suggest the Bronstein (also called Pytel-Wade … to play, without much (if any) theory, as black's plan is very easy: Bg4, Nc6, O-O-O and go crazy against almost any development scheme that white adopts. Definitely a line worth consideration …
answered Sep 22 '14 by Pablo S. Ocal
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I believe there are a few gambits completely solved, that is, analyzed up to positions that either the material advantage is enough to guarantee a win or this win is achieved by means of technique (if …
answered Sep 20 '14 by Pablo S. Ocal