The Polerio Defense is a variation of the Two Knights Defense, catalogued as ECO C58. The line runs 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5, reaching the position shown below after 10 half-moves.
Both sides have pawns in the centre (White on d5, Black on e5). Development is level at two minor pieces each, and White is up a pawn of material. It is White to move after five moves. White has doubled pawns on the d-file.
On the Two Knights Defense generally: Black counters 3.Bc4 with Nf6, challenging the e4 pawn immediately. Leads to sharp, tactical play especially after 4.Ng5.
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The Polerio Defense goes 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5. It is a variation of the Two Knights Defense and is catalogued as ECO C58.
The Polerio Defense is ECO C58. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Two Knights Defense.
Stockfish evaluates the position after 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 at +0.08 at depth 18, which is balanced. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
Both sides have pawns in the centre (White on d5, Black on e5). Development is level at two minor pieces each, and White is up a pawn of material. It is White to move. White has doubled pawns on the d-file.