Library/Openings/Four Knights Game/Halloween Gambit/Plasma Variation ECO C47
Opening· 22 plies

Four Knights Game: Halloween Gambit, Plasma Variation

An entry in the Encyclopedia of Chess Openings (ECO C47), reached after 22 half-moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 Nxe5 5. d4 Nc6 6. d5 Ne5 7. f4 Ng6 8. e5 Ng8 9. d6 cxd6 10. exd6 Qf6 11. Nb5 Rb8.

Four Knights Game: Halloween Gambit, Plasma Variation ECO C47
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Black rook
Black bishop
Black king
Black bishop
Black knight
Black rook
Black pawn
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Black pawn
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Black pawn
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White pawn
Black queen
Black knight
White knight
White pawn
White pawn
White pawn
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White rook
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White queen
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White bishop
White rook
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End of this line

No further variations branch from this position in our database. To explore neighbouring ideas:

About this opening

Four Knights Game: Halloween Gambit, Plasma Variation is an opening in the Encyclopedia of Chess Openings, classified under code C47. 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 22 half-moves from the starting position, with the move sequence 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 Nxe5 5. d4 Nc6 6. d5 Ne5 7. f4 Ng6 8. e5 Ng8 9. d6 cxd6 10. exd6 Qf6 11. Nb5 Rb8.

It belongs to the Four Knights Game family. Within that family this is a level-2 branch (the Halloween Gambit → Plasma Variation line). The immediate parent line is Four Knights Game: Halloween Gambit, transitioned via 11…Rb8.

The opening sequence in prose form: 1.e4 e5, 2.Nf3 Nc6, 3.Nc3 Nf6, 4.Nxe5 Nxe5, 5.d4 Nc6, 6.d5 Ne5. 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.