The London Noose

I’ve been playing the London System almost exclusively for a while, and this is a repeatable idea I developed through play. I call it the London Noose.

It shows up in rapid games (10+0) often enough to be worth sharing.

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The idea

From a standard London setup:

1. d4 d5
2. Bf4 Nc6
3. e3 Nf6
4. Nf3 Bf5
5. c4 e6
6. c5

The move c5 often provokes the natural response:

6... b6?

After that, the position collapses tactically.

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The trap

7. Bb5 Qd7
8. Qa4

The knight on c6 is pinned and overloaded, and the rook on a8 becomes a target. Even with correct play, Black is forced to lose material.

One full example:

1. d4 d5
2. Bf4 Nc6
3. e3 Nf6
4. Nf3 Bf5
5. c4 e6
6. c5 b6
7. Bb5 Qd7
8. Qa4 O-O-O
9. Bxc6 Qe7
10. Qxa7

White is winning after this.

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Notes:
• If Black avoids b6 or takes on c4 earlier, this doesn’t work and White plays a normal middlegame.
• The motif exists in theory, but I haven’t seen this exact move order and conversion written up.
• If anyone has seen this documented elsewhere, I’d be interested.