Christof Sielecki is an International Master from Germany. He has been teaching and training chess for many years, and runs an extremely popular YouTube channel called ChessExplained.
"Sieleckis's repertoire is sound and annoying. Exactly the sort of
thing that will make many an opponent groan."--Glenn Flear,
Grandmaster and author of 'Starting Out: the Open Games'
'IM Sielecki has poured an insane amount of time and effort into crafting this White repertoire, focusing for the most part on lines that are used by top GMs but that lie outside of the main streams of opening theory. Because the coverage of every option is so extensive, purchasing 'Keep it Simple: 1.e4' really is like buying a set of repertoire books. In addition, Sielecki repeatedly points out popular alternative lines that you can study if you want to branch out on your own. If you are an ambitious player related 1500 or higher, and you'd like to round out a serious, bulletproof 1.e4 repertoire suitable for employment up to the titled player level, and you're ready to squeeze your opponent when the position calls for squeezing and to blitz him when it calls for a lightning strike, you simply can't lose here."--Timothy McGrew, National Master
"Solid and easy to learn!"--Elburg Chess Reviews
"An opening repertoire based on simple and straightforward lines that pack some poison (..) Sielecki has been careful not to overwhelm the reader with too much analysis."--John Donaldson, International Master
"An excellent book that delivers exactly what the title states: A relatively simple (700+ variations!), solid and straightforward repertoire. Many 1500+ players will be very happy that this repertoire is now available."--Han Schut, National Master "Chess.com "