The Two Knights Defense, Polerio Defense, Yankovich Variation is a variation of the Italian Game, catalogued as ECO C58. The line runs 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 h6 7. Nf3 e4 8. Qe2 Nxc4 9. dxc4 Bc5 10. Nfd2, reaching the position shown below after 19 half-moves.
Both sides have pawns in the centre (White on d5, Black on e4). Development is level at two minor pieces each, and White is up a pawn of material. It is Black to move after ten moves. White has doubled pawns on the c-file; Black has the bishop pair.
On the Italian Game generally: A classical opening focusing on rapid development and control of the center with pieces.
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The Two Knights Defense, Polerio Defense, Yankovich Variation goes 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 h6 7. Nf3 e4 8. Qe2 Nxc4 9. dxc4 Bc5 10. Nfd2. It is a variation of the Italian Game and is catalogued as ECO C58.
The Two Knights Defense, Polerio Defense, Yankovich Variation is ECO C58. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Italian Game.
Stockfish evaluates the position after 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 h6 7. Nf3 e4 8. Qe2 Nxc4 9. dxc4 Bc5 10. Nfd2 at -0.53 at depth 18, which is a slight pull for Black, within normal opening margins. 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 e4). Development is level at two minor pieces each, and White is up a pawn of material. It is Black to move. White has doubled pawns on the c-file; Black has the bishop pair.