McConnell Defense

The McConnell Defense, 1. e4 e5 2. Nf3 Qf6, meets the attack on e5 by guarding the pawn with the queen instead of a minor piece. It is also known as the Greco Defense, because Gioachino Greco was among the first to record and refute it. The later name honors James McConnell, who used it against his friend Paul Morphy.

The defense of e5 is sound, but it costs Black in two ways. The queen takes f6, the most natural post for the g8-knight, so kingside development and castling are delayed. The queen is also exposed early, and White can attack it with developing moves that each gain a tempo. Unlike 2...Nc6, which develops while defending, 2...Qf6 gives White a lead in development almost by force.

3. Nc3 is the engine's first choice and the second most common reply online. It threatens Nd5, which centralizes the knight while hitting the queen, whether or not d4 comes first. Black has to spend a move preventing this, and White uses the time for Bc4 and O-O. The most popular reply is 3. Bc4. After 3...Qg6, which attacks e4 and g2 together, White can play 4. O-O, the La Bourdonnais Gambit, which Greco had also analyzed. Taking the pawn with 4...Qxe4 runs into 5. Bxf7+, and Black ends up in difficulties.

A third approach is to open the center at the cost of material. After 3. d4 exd4 4. c3 dxc3 5. Nxc3, White has given up a pawn for rapid development and open lines. The aim is to gain further time against the misplaced queen.

The engine gives White a clear advantage, and the line is rarely seen in professional play. It is common online, ranking around 150th of roughly 3,200 named openings by games reached. On Lichess the results are closer than the evaluation suggests: White wins about half the games, Black slightly fewer, and draws are rare.