Library/Openings/King's Gambit Accepted/Kieseritzky/Polerio Defense ECO C39
Opening· 10 plies

King's Gambit Accepted: Kieseritzky, Polerio Defense

An entry in the Encyclopedia of Chess Openings (ECO C39), reached after 10 half-moves: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Be7.

King's Gambit Accepted: Kieseritzky, Polerio Defense ECO C39
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Black rook
Black knight
Black bishop
Black queen
Black king
Black knight
Black rook
Black pawn
Black pawn
Black pawn
Black pawn
Black bishop
Black pawn
Black pawn
White knight
White pawn
Black pawn
Black pawn
White pawn
White pawn
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White pawn
White pawn
White pawn
White rook
White knight
White bishop
White queen
White king
White bishop
White rook
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End of this line

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About this opening

King's Gambit Accepted: Kieseritzky, Polerio Defense is an opening in the Encyclopedia of Chess Openings, classified under code C39. ECO group C (C00–C99) covers open games (1.e4 e5) and the French Defence, including the Ruy Lopez, Italian, Scotch and King's Gambit. This particular variation is reached after 10 half-moves from the starting position, with the move sequence 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Be7.

It belongs to the King's Gambit Accepted family. Within that family this is a level-2 branch (the Kieseritzky → Polerio Defense line).

The opening sequence in prose form: 1.e4 e5, 2.f4 exf4, 3.Nf3 g5, 4.h4 g4, 5.Ne5 Be7. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.