OFFERIvan Sokolov is a Dutch Grandmaster and author of many popular chess books. ***Understanding Middlegame Strategies Vol.1 - 11 Master your middlegame with the complete strategy series – now available as a bundle at a reduced price. However, they share a common strategic challenge: the value of tempi, structure, and psychology when familiar openings are played with colours reversed. However, they share a common strategic challenge: the value of tempi, structure, and psychology when familiar openings are played with colours reversed. However, they share a common strategic challenge: the value of tempi, structure, and psychology when familiar openings are played with colours reversed.