- ECO code
- A45
- Moves
- 1.d4 Nf6 2.Bf4
- Family
- Indian Defense
- To move
- Black
- Master games
- 647
- Average game length
- 47 moves
- Years covered
- 1930–2026
Indian Defense: Accelerated London System is the opening filed under ECO code A45, reached after 1.d4 Nf6 2.Bf4. It belongs to the Indian Defense family and is known as the Accelerated London System; in the resulting position it is Black to move.
Katuranga's collection of 138,070 master games contains 647 games on this line — the 173rd most played opening in the collection. The oldest game on this line is from 1930 and the most recent from 2026. The busiest decade in this collection is the 2020s, with 443 games. An average game here lasts 47 moves.
White wins 46% of those games, 23% end in a draw, and Black wins 31%. Compared with the collection average (White 37%, draws 35%, Black 28%), Black scores better here by 3 percentage points. Draws are less common here than usual, by 12 points.
From this position the most popular move is 2...d5, played in 246 games, followed by 2...g6 (157) and 2...e6 (88). After 2...d5 White scores 48% and Black 27%.
The name that appears most often on the White side of this line is Carlsen,M (73 games); on the Black side, Nepomniachtchi,I (35).
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Results in master games
- White 46% (297)
- Draws 23% (152)
- Black 31% (198)
Most played continuations
| Move | Games | White / draws / Black | Leads into |
|---|---|---|---|
| 2...d5 | 246 | 48/25/27 | — |
| 2...g6 | 157 | 46/19/35 | — |
| 2...e6 | 88 | 51/27/22 | — |
| 2...c5 | 83 | 39/19/42 | — |
| 2...d6 | 33 | 55/30/15 | — |
| 2...b6 | 32 | 25/31/44 | — |
| 2...h6 | 3 | 33/0/67 | — |
| 2...c6 | 2 | 50/0/50 | — |
How the position is reached
- Queen's Pawn Game · 1.d4 · 45,810 games
- Indian Defense · 1.d4 Nf6 · 29,631 games
Played most often by
As White
- Carlsen,M 73
- Grischuk,A 73
- Aronian,L 43
As Black
- Nepomniachtchi,I 35
- Caruana,F 30
- Vachier Lagrave,M 27
Games per decade
- 1930s 1
- 2010s 203
- 2020s 443
Master games on this line
| White | Black | Result | Year | Events |
|---|---|---|---|---|
| Atanasov,Anthony | Grischuk,A | 1-0 | 2026 | 2nd 3-0 Thu 5th Feb 2026 |
| Taher,Yoseph Theolifus | Caruana,F | 1/2-1/2 | 2026 | 1st 3-0 Thu 2nd Apr 2026 |
| Ponomarev,Grigori | Caruana,F | 1/2-1/2 | 2026 | Titled Tue 24th Mar 2026 |
| Nakamura,Hi | Sarana,A | 1-0 | 2026 | 1st 3-0 Thu 25th Jun 2026 |
| Le Tuan Minh | Nepomniachtchi,I | 1-0 | 2026 | 1st 3-0 Thu 15th Jan 2026 |
| Rosen,E | Caruana,F | 1/2-1/2 | 2026 | 2nd 3-0 Thu 15th Jan 2026 |
Frequently asked questions
What is the Indian Defense: Accelerated London System?
It is the opening with ECO code A45, reached after 1.d4 Nf6 2.Bf4. It belongs to the Indian Defense family.
Is the Indian Defense: Accelerated London System good for White or for Black?
In 647 master games on this line White wins 46%, 23% are drawn and Black wins 31%. The collection average is White 37%, draws 35%, Black 28% — so this line is a slightly better bargain for Black than the field as a whole.
What is the main continuation of the Indian Defense: Accelerated London System?
2...d5 — played in 246 of the master games on this line.
Which grandmasters play the Indian Defense: Accelerated London System?
On the White side Carlsen,M (73), Grischuk,A (73), Aronian,L (43); on the Black side Nepomniachtchi,I (35), Caruana,F (30), Vachier Lagrave,M (27).
Every number on this page is computed from Katuranga's master game collection; names and ECO codes follow the lichess opening book (CC0).
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