ECO A09 · Réti Opening

Réti Opening: Reversed Blumenfeld Gambit

1. Nf3 d5 2. c4 d4 3. e3 c5 4. b4

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Black to move. The arrow shows Stockfish’s best move.
Best move

4… Nf6−0.07

The position is roughly equal. Stockfish 18, depth 18.

Analyze this position

In the Réti Opening: Reversed Blumenfeld Gambit (A09), reached after 1. Nf3 d5 2. c4 d4 3. e3 c5 4. b4, Stockfish 18 recommends 4… Nf6 for Black. The position is roughly equal (−0.07).

Top engine moves

  1. −0.074… Nf6 5. a3 Bf5 6. exd4 cxd4 7. d3 e5 8. Nxe5 Qe7 9. Qe2
  2. −0.054… dxe3 5. fxe3 cxb4 6. d4 e6 7. a3 Nf6 8. c5 bxa3 9. Nxa3
  3. +0.074… cxb4 5. exd4 e6 6. a3 Nc6 7. Bb2 Nge7 8. axb4 Nxb4 9. Be2

Frequently asked questions

What is the best move in the Réti Opening: Reversed Blumenfeld Gambit?
After 1. Nf3 d5 2. c4 d4 3. e3 c5 4. b4, Stockfish 18 at depth 18 recommends 4… Nf6 for Black, continuing 5. a3 Bf5 6. exd4 cxd4 7. d3 e5 8. Nxe5 Qe7 9. Qe2. The position is roughly equal (−0.07). The next best moves are 4… dxe3 (−0.05) and 4… cxb4 (+0.07).
Is the Réti Opening: Reversed Blumenfeld Gambit a good opening?
Stockfish rates the position at −0.07: the position is roughly equal. Evaluations this early in the game are small, so practical results depend far more on knowing the plans and typical structures than on the engine's number.
What is the ECO code of the Réti Opening: Reversed Blumenfeld Gambit?
A09. ECO codes classify chess openings from A00 to E99; A is the volume for flank openings.

Opening names from the Lichess opening book (CC0). Pieces by Colin M.L. Burnett (GPLv2+).