Engine-verified chess things.
Hand-built trainers on live boards. Every published line is checked by Stockfish at depth 22+ before it's allowed to teach you anything.
The French Room
Beat one specific 1.e4 player: the Advance plan, the Milner-Barry, the Greek gift drill, a simulator of the man himself, and a live voice coach who sees your board.
The Traxler Files
1890: a priest answers the Fried Liver with 4...Bc5!?. All three king replies to the f2 bishop — the capture, the cold f1 decline, and the full mate-in-the-middle stem game.
Room 1800
Mates that win club games. Bird's smothered mate, Bok's two-knight net, Philidor's Legacy, the killer-knight queen sacrifice, a Scotch king hunt, the Caro-Kann pin trap, Greco's rook and Légal's mate — every line engine-verified.
Hayden
A rook given away for a knight, two bishops that cage a king in the corner, and a stalemate wall only the white king can walk through — discovered check by discovered check, down the diagonal to mate. Engine-verified.
Whatever gets asked for
This index grows one obsession at a time.