Teichmann with 6...Bh5 and g4

If Black retreats the bishop to h5 instead of trading, White unleashes the pawn storm with g4, Ne5, and h4, threatening to trap the piece with h5.

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 e6 9.h4

Move by move

1.d4 – White opens with 1.d4: firmly staking a claim in the center, governing key squares c5 and e5, and opening paths for the light-squared bishop.
1...d5 – Symmetrical central answer 1...d5: Black anchors a pawn firmly in the center to dispute territory and avoid early space concessions.
2.e4 – The Blackmar-Diemer Gambit begins with 2.e4: a bold strike aimed at deflecting Black's d5-pawn and opening vicious attacking lines.
2...dxe4 – Accepting the gambit 2...dxe4: Black pockets the central pawn, ready to defend the material gain with careful and precise play.
3.Nc3 – Aggressive development 3.Nc3: the knight immediately attacks the advanced e4-pawn, stepping up pressure on Black's central outpost.
3...Nf6 – Natural defense 3...Nf6: Black mobilizes the knight toward the center, solidly defending the extra pawn on the contested e4-square.
4.f3 – The conceptual heart of the gambit 4.f3! White offers a second pawn to blow open the f-file and accelerate piece mobilization.
4...exf3 – Forced capture 4...exf3: Black accepts the second pawn sacrifice, but gifts White a powerful and completely open f-file for the rook.
5.Nxf3 – Active recapture 5.Nxf3: the knight leaps into action with dynamic energy; White is down a pawn but possesses massive development.
5...Bg4 – Teichmann Defense 5...Bg4: Black pins the f3-knight to restrain White's central pressure and diminish kingside attacking prospects.
6.h3 – Immediate interrogation 6.h3! White forces the bishop to declare its intentions before Black can complete harmonic development.
6...Bh5 – Declining the trade 6...Bh5: Black chooses to retain the bishop pair by retreating along the diagonal, but concedes vital attacking tempi.
7.g4 – Attacking with tempo 7.g4! White advances the g-pawn aggressively to evict the bishop and conquer massive kingside terrain.
7...Bg6 – Forced retreat 7...Bg6: Black's bishop is forced back to g6, where its activity and mobility are severely constricted by White's pawns.
8.Ne5 – Central invasion 8.Ne5: the knight lands in the center with overwhelming force, placing Black's trapped bishop under direct crosshairs.
8...e6 – Belated defense 8...e6: Black attempts to reinforce the position and create escape routes, but White's pawn avalanche is unstoppable.
9.h4 – The killer thrust 9.h4! White unleashes an unstoppable h5 threat that will either trap the g6-bishop or shatter Black's kingside structure.

How to exploit the position

White punishes Black's passive retreat by gaining overwhelming attacking tempi

Exploit ...Bh5 by immediately pushing g2-g4 with a tempo on the bishop
Vigorously centralize the knight to e5 threatening the piece and dominating the center
Launch the h3-h4 pawn thrust with the concrete threat of trapping the bishop on g6
Convert dominant space and development into a swift kingside mating attack

Master tips

Gaining critical attacking tempi

Every pawn move driving Black's bishop backward gifts White precious development tempi