Yakov Neishtadt
The best advice for chess players who want to improve quickly is: get better at tactics! Simply because the vast majority of amateur games is decided through tactics you will immediately start beating more opponents when you improve your tactical skills. Experienced Russian Grandmaster Jakov Neishtadt has selected those examples from the games of masters that have the biggest instructional value for club players. In the first part of the book Neishstadt teaches a systematic course on the most important tactical themes. The second part consist of an exam with hundreds of tests from real-life chess, in random order so as not to give unwelcome hints on how to solve them. The solutions are not just lists of moves, but include instructive prose.
Games,Chess
Improve Your Chess Tactics: 700 Practical Lessons & Exercises