Adding one takes a copy — edit it, rename it, cut the lines you will never play. Then Treeline asks you for your own moves and schedules each of them on its own clock, so the ones you keep getting wrong come round more often. Start free.
A surprisingly aggressive 1.d4 repertoire, trimmed down so you're not stuck memorizing endless lines.
Let White build the big center: then spend the game tearing into it.
One of the most dynamic answers to 1.d4: sharp, unbalanced, and built for immediate counterplay.
Simple to learn, clear plans, solid center — and yes, real attacking chances too.
Positional soundness with a fianchetto bishop doing superhero work. Opponents rarely see it coming.
Sharp, surprising Central Gambit lines that put pressure on Black from move one.
The Advance Variation: grab space early and make Caro-Kann players work for everything.
An ambitious anti-French repertoire that puts Black on the defensive right from the opening.
Crush the Scandinavian after ...Qxd5, ...Qa5, or ...Qd8.
Play energetically and grab the edge against every Scandinavian sideline.
Don't let White get comfortable: meet 2.Nc3 with ...Nf6 and take the game into your own hands.
Give up a pawn, get your pieces out fast, and make 1.d4 players watch for traps from the start.
Underrated, tricky, and built for players who like sacrifices.
Surprise opponents with 4.a3 and have them regretting it by move ten.
Sac the knight, grab the king. 12345 boom.
A reliable weapon that either traps your opponent outright or hands you a great attacking position.
One of the easiest openings to learn, with a solid structure and real attacking potential.
Tired of long lines? Play 1.b3 and bamboozle people from move one.
A solid kingside fianchetto that pressures Black's center while we stay in control and play for the edge.
Scandinavian for Black, with practical ideas from IM Maksim Shchekachikhin.
Develop fast, gambit a pawn, and rip the center open before Black's pieces wake up.
Pile pressure on White's center with pieces and pawn breaks. Prepare for combat.
Polish your repertoire and cover the other lines Black will actually throw at you.
Counter the Queen's Gambit with a poisonous, perfectly sound gambit.
Simple and rock-solid, it feels like a brick wall to your opponents, while you still keep chances to win.
Most players can't resist grabbing 5.Nxf7. If they do, you're ready with the theory that punishes it.
A full 1.d4 repertoire against 1...Nf6 built around 2.Bg5: fresh positions, lots of poison.
Win a tempo, sac a pawn to open lines, and go straight after the king. GM-approved.
Bishop on b2, knight on e5, bishop on d3: a clean base for kingside piece play.