I'm 1700 OTB (1900 online) and know that I lack some basic knowledge as I've started play tournament chess with age 20. One weakness is mating patterns leading where I even (successfully) based my opening repertoire as a workaround on it (W: English/Reti, B: KID/Pirc). However, knowing about this weakness causes some pain now and then and I look in to mating literature and give up quite fast. But man, this one chessable course is really addictive. I purchased it just yesterday and didn't stop until I had the basic chapters done. I really wanted to know what comes next despite the review counter increased quite fast for other courses. In terms of content everything has been said in other reviews but I just wanted to thank CraftyRaf for this course. This is just perfect for me! Btw: 5/5 stars from me :-)