Over the years we have gradually come to understand the true nature of chess. Correspondence chess - a sublime search for truth. OTB - a tense and noble struggle. Blitz - one of mankind's earliest attempts to invent the video game.
But it is no worse for that. In between working on my endgame book, I have another project: Making a detailed repertoire based on sound lines which happen to score best on Lichess for players in the 2000 - 2200 rating range. It is already quite a large work - 50 plus lines, some of which are 30 or more moves deep.
This book is different. The same idea - lines which score very well in practice - but aimed at players 1600 and below. There are fewer lines to learn, and in a much more manageable depth. Analytical soundness is very much less to the fore - indeed, some of them are almost dubious. And yet I have faith that these lines would score far better in practice than they really ought to.
The core of the repertoire is a set of interpretations of the Blackmar-Diemer gambit - but more often than not castling queen, rather than kingside. Black has the chance to sidestep into other lines - but I have found thematically similar attacks against most of those as well. I can't promise you'd win a correspondence chess championship with these lines- but I can promise an easy to learn set of variations with very good practical hacking chances.