ECO C70 · Ruy Lopez

Ruy Lopez: Morphy Defense, Cozio Defense

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7

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

5. c3+0.51

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Ruy Lopez: Morphy Defense, Cozio Defense (C70), reached after 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7, Stockfish 18 recommends 5. c3 for White. White is slightly better (+0.51).

Top engine moves

  1. +0.515. c3 g6 6. d4 exd4 7. cxd4 b5 8. Bb3 Na5 9. h4 Nxb3
  2. +0.405. Nc3 Ng6 6. d4 exd4 7. Nd5 b5 8. Bb3 Bc5 9. Ng5 O-O
  3. +0.385. O-O g6 6. c3 Bg7 7. d4 exd4 8. cxd4 b5 9. Bb3 Na5

Frequently asked questions

What is the best move in the Ruy Lopez: Morphy Defense, Cozio Defense?
After 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7, Stockfish 18 at depth 18 recommends 5. c3 for White, continuing g6 6. d4 exd4 7. cxd4 b5 8. Bb3 Na5 9. h4 Nxb3. White is slightly better (+0.51). The next best moves are 5. Nc3 (+0.40) and 5. O-O (+0.38).
Is the Ruy Lopez: Morphy Defense, Cozio Defense a good opening?
Stockfish rates the position at +0.51: white is slightly better. 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 Ruy Lopez: Morphy Defense, Cozio Defense?
C70. ECO codes classify chess openings from A00 to E99; C is the volume for open games and the French Defense.

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