d4
![](https://lichess1.org/assets/______2/flair/img/symbols.large-green-circle.webp)
Openings: Catalan
1 • J-Jones •- Intro
- Open Catalan, Mainline (Qc2, Classical Line)
- Open Catalan, Second Mainline (Ne5)
- Open Catalan, Mainline 3
- J-Jones
![](https://lichess1.org/assets/______2/flair/img/symbols.female-sign.webp)
London System Repertoire
415 • Peng_Dehuai1898-1974 •- Introduction to the London System
- == 1.d4 d5 ==
- 1...d5 Move-order discussion (️ IMPORTANT ️)
- 1...d5 Mainline with 5...Qb6
- Peng_Dehuai1898-1974