The Danish, mirrored
Same currency as your White repertoire: material for time. One pawn buys the d6-bishop's diagonal toward h2, fast castling, and open central files while White's queenside still sleeps.
← Your repertoireSolve them
An opening course for Black (ECO A40)
Hartlaub-Charlick Gambit
1.d4 players sign up for slow, structured games. 1...e5 tears the form up on move one: no London System (2.Bf4 is impossible), no Queen's Gambit setup, and after 2.dxe5 d6 3.exd6 Bxd6 Black has the Danish trade in reverse, a pawn for a development lead and open lines. The course follows the published treatments of the gambit, FM Stefan Bücker's Englund work and GM Igor Smirnov's Hartlaub-Charlick analysis, with every line re-checked by Stockfish. The honest bill is under a pawn in the accepted lines; the practical bill for White is a sharp game they never wanted.
This course is part of your daily work.
Before the moves: the big ideas
It cancels White's whole repertoire
After 1...e5 there is no London (2.Bf4 no longer exists as a plan), no Catalan, no slow Queen's Gambit. Whatever White studied this morning, it is not happening today.
The honest ledger
Stockfish says roughly minus 0.8 for Black in the accepted main line and about a pawn and a half if White declines precisely with 3.Nf3. That is the price tag; this is a practical weapon, not a claim of equality. Play it when you want the fight, with numbers you know in advance.
The battery and the storm
The system: knights to f6 and c6, bishop to g4, queen to e7, castle long. Your d8-rook then stands behind the d6-bishop, aimed at White's queen, and the bishop leaves the file with check on h2. When White defends correctly, the h-pawn storms the short-castled king instead. Both plans live in the accepted chapter.
The lines, chapter by chapter
Learning order, one scoresheet per chapter. The coach serves review one line a day; enter any line directly when you want it now.
Start Here: The Offer
Three moves each and the whole idea is on the board: e5 offered, d6 offered, and the bishop recaptures with a diagonal pointed at White's future king.
Accepted: The Attack System
The system this gambit exists for: knights to c6 and f6, bishop to g4, queen to e7, and the king castles long. The d8-rook then stands behind your d6-bishop, staring at White's queen, and the bishop leaves that file with check. The pieces can arrive in more than one order; what matters is the destination. Three tracks: the trap when White castles into it, the storm when White defends precisely, and the solid track against an early knight raid.
Declined: 3.Nf3, the Engine's Choice
The strongest reply per Stockfish is not taking twice but holding the extra pawn with 3.Nf3, at around a pawn and a half for White. Know the price, then make the position as awkward as possible: that is what a practical gambit means.
Quiet Declines
Some White players refuse the whole conversation: 2.e3, 2.d5 or 2.Nf3. Each hands back the initiative or the structure; none should cost you a second of worry.
Puzzles from this opening
Club games that started in the Hartlaub-Charlick Gambit produced these tactics, and you solve every one from Black's side, the seat you actually sit in. Difficulty follows your solving, the same as the puzzle room.