Why is this opening repertoire called simple? For the simple reason that the variations are straightforward and easy to remember, and require little or no maintenance.
International Master Christof Sielecki has created a reliable set of opening lines for chess players of almost all levels. The major objective is to dominate Black from the opening, by simple means. You don’t need to sacrifice anything or memorize long tactical lines. Unless Black plays something stupid, when tactics are the simplest punishment.
Sielecki developed this repertoire working with students who were looking for something that was easy to understand and easy to learn. Most of the lines he selected are occasionally played by grandmasters, but on the whole they lie outside the mainstream of opening theory. That means that there is hardly any need to monitor theoretical developments.
Sielecki always clearly explains the plans and counterplans and keeps you focussed on what the position requires. Ambitious players rated 1500 or higher will get great value out of studying this extremely accessible book.