The book Practical Chess Analysis from Mark Buckley is very disappointing.
It is a nice read, but the exercises aren't checked with the computer. I have a second hand version from 1999, may be there is a newer version?
I have done 2 exercises, costing me 2 hours each. I couldn't find my way in both problems. When I checked the solutions from the book with Rybka, the solutions were flawed. Again 4 hours spilled by an incompetent author.
Before I adopt mature man's play and a mature man's opening repertoire I want to investigate the road of brilliant chess. So I'm looking for complex problems from real games with lots of lines to calculate and a clear solution in the end. Computer checked.
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