Blackmar-Diemer Gambit: Zeller Defense: Plans and Traps

Key ideas for both sides

White

4.g4 kicks the bishop to g6, and a knight from e2 to g3 adds attackers to the e4 pawn.
h4 follows to threaten h5 and trap the g6 bishop, as in the main engine line.
4.f3 hits e4 directly; after ...Nf6 and fxe4 Nxe4, Qf3 hits the knight and the f5 bishop.
4.Bc4 with Nge2 and short castling is a quieter way to develop.

Black

Against 4.g4, drop back to g6 and strike with ...e5, then meet h4 with ...h5.
...Nf6 and ...e6 support the bishop and the e4 pawn in the slower lines.
...Nd7 and ...Ngf6 develop without blocking the c-pawn, keeping ...c6 or ...c5 available.

Plans and pawn structure

After 4.g4 Bg6, White has kingside space and threatens h4 and h5 to trap the bishop, while e4 is attacked by Ng3 and possibly f3. Black must answer with ...e5 and ...h5 to fight for the dark squares and keep the bishop safe. In the slower lines with Bc4 or f3, Black develops with ...Nf6 and ...e6 and is happy to trade pieces on e4.

Where the engine's main line heads: White pawn d4, no e-pawns for White, no d-pawn for Black. White has a pawn on d4 and no e-pawn; Black has no d-pawn. White has more central space; Black's pieces are free and the d4 pawn is a target.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position −0.20: level. Its three top choices for White:

−0.20 4.g4 Bg6 5.Nge2 e5 6.Be3 Nd7
−0.54 4.f3 Nf6 5.fxe4 Nxe4 6.Qf3 Nxc3
−0.75 4.Bc4 Nf6 5.Nge2 e6 6.O-O Nbd7

Pawns, from White's side.

How it scores on lichess

1,174 rated lichess games reached this position; White scored 55.7%.

under 120054.2%

1200–159956.3%

1600–199956.5%

2000 and up50.0%

Light: White wins. Grey: draws. Dark: Black wins. About the sample.

Where it goes next

Zeller Defense, Soller Attack4.f3 · rare

How to play against it

Play 4.g4 at once and follow with Nge2 and h4. The bishop on g6 can get trapped, and e4 falls once your knight reaches g3. Avoid slow development, since Black keeps the pawn and the bishop if you give it time. White scored 55.7% overall in this line.

Questions

What are the moves of the Blackmar-Diemer Gambit: Zeller Defense?

The Blackmar-Diemer Gambit: Zeller Defense starts 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5. Its ECO code is D00.

Is the Blackmar-Diemer Gambit: Zeller Defense good for Black?

Stockfish 17.1 rates the position −0.20 at depth 20, which is level. In 1,174 lichess games from our sample, White scored 55.7%. Good for Black players who like an early bishop but know the ...e5 and ...h5 answers to g4; White gets a clear attacking plan.

What is the main idea of the Blackmar-Diemer Gambit: Zeller Defense?

Black defends e4 with the light-squared bishop before playing ...Nf6. White's main answer is g4, chasing the bishop and preparing h4 and Ng3 to win the e4 pawn back.

What should White play next?

The engine's first choice is g4, with f3 and Bc4 close behind. 4.g4 hits the bishop at once and prepares h4 and Ng3 to pressure g6 and e4.

Updated October 2026. Sources and method.

Blackmar-Diemer Gambit: Zeller Defense