9. Waller Attack (6.d4 exd4 7.O-O d6 8.Qb3 Qd7)

The Waller Attack ties Black's queen to the defense of f7, setting up the suffocating Bb5 pin that completely disrupts Black's defensive coordination.

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.O-O d6 8.Qb3 Qd7 9.cxd4 Bb6 10.Rd1

Move by move

1.e4 – The premier opening thrust: White stakes out the central high ground with e4, opening paths for the light-squared bishop and queen to ignite the battle.
1...e5 – Classical symmetrical response: Black establishes a firm central foothold, preventing White's immediate d2-d4 push and preparing rapid minor piece development.
2.Nf3 – Direct attacking development: the knight sorties to f3 targeting the undefended e5-pawn, exerting control over d4, and preparing swift kingside castling.
2...Nc6 – Logical defensive development: Black's knight protects the vital e5-pawn and guards key squares d4 and e5, getting ready for the upcoming central clash.
3.Bc4 – The Italian Game: the bishop takes aim directly at the vulnerable f7-square, the most fragile coordinate in Black's camp defended only by the king.
3...Bc5 – The Giuoco Piano: Black actively develops the bishop to c5, controlling d4 and facing off against White's bishop along the active diagonal.
4.b4 – The Evans Gambit! White audaciously sacrifices the b4-pawn to deflect Black's bishop from c5, seize crucial tempi with c3 and d4, and dominate the center.
4...Bxb4 – Black accepts the gambit pawn by capturing on b4, but hands White vital development tempi to construct a massive central pawn roller with the coming c3 push.
5.c3 – The strategic linchpin of the Evans: the pawn hits the bishop gaining a golden tempo, simultaneously preparing the potent d2-d4 thrust to command the board.
5...Ba5 – The main retreat: the bishop drops back to a5 maintaining pressure along the c3-diagonal, standing ready to support the d7-pawn after White strikes with d4.
6.d4 – The monumental central breakthrough! With d4 White strikes at the heart of Black's position with tempo, blowing open lines for heavy artillery pieces.
6...exd4 – Black surrenders central tension by taking on d4, cracking open the central e-file and exposing their king to White's energetic attacking threats.
7.O-O – Captain Evans's key idea: White tucks the king into safety and readies the f1-rook along the open central e-file before bothering to reclaim material.
7...d6 – Black reinforces the center with d6 seeking stability, but gifts White the crucial tempo needed to organize a devastating kingside assault.
8.Qb3 – The Waller Attack! The queen settles on b3 creating the classical battery with the c4-bishop, compelling Black into an awkward queen defense.
8...Qd7 – Black's queen steps clumsily to d7 to protect f7, but clutters the c8-bishop's diagonal and severely tangles defensive piece coordination.
9.cxd4 – Flawless central recapture: White reconstitutes the dominant d4-e4 pawn duo, suffocating Black's pieces and denying them active outposts.
9...Bb6 – The bishop retreats to b6 to escape the open file, but leaves the c6-knight defenseless against White's impending tactical pin maneuver.
10.Rd1 – Lethal centralization: the rook occupies the wide-open d-file, pinning the opposing d7-queen with X-ray vision straight toward Black's king.

How to exploit the position

Exploit the passive placement of Black's queen on d7

Exert instant pressure with Qb3 forcing the awkward Qd7 defense
Reclaim the d4-pawn with cxd4 preserving a dominant central steamroller
Pin the c6-knight with Bb5 and maintain the bishop clamp on a4
Force Black's king to forfeit castling rights by stepping to f8

Master tips

Dislocate defensive cornerstones

When the enemy queen is demoted to defending a mere pawn, their entire setup collapses