I read this book many years ago and feel it helped me significantly improve my understanding of how to handle middlegame positions. Whilst it is true that Keres analysis is superior to Kotov's, the quality of all the material is good and it should be remembered that Keres was a far stronger player than Kotov. That said, now that I have returned to chess after a break of many years, it is in particular the chapter by Kotov on how to attack in positions of opposite side castling that I remember most. I would be surprised if most club players could not take several nuggetts of wisdom from this book and use it to their advantage during their games. It should also be noted that Harry Golombek's introduction is of a high quality, as was all his work, I had the priviledge of meeting Golombek some years ago, I think his dedication to chess showed in all his works, most notably those on Capablanca and Reti.