Playing as a Black.

C5

E5 anyways

D5

Deferred Dutch (1...e6/2...f5) - Avoids the stupid Gambits and Bg5 lines.

Sicilian defence

Against d4

Uhm, that's impossible. Read the OP. Against 1.d4.

only dutch is possible

Against d4? Hmm... I usually play d4 as white, but I've never seen it played as black. My response to e4 is c6, Caro-Kann, But I would probably just play d5, move my knight (forgot the notation for the move), then b3, Bb2, fianchettoing my dark-squared bishop (correct me if I notated it wrong. Apologies.)

If white plays 1.d4...the only civilized response is 1...d5,of course.

Fairly strong and quite simple to learn: Queen's Gambit Accepted.

For black try this new Defense The Audi Defense is a flexible hybrid between the English Defense and Old Indian setups, created by Jose Audiel Gallegos Garcia ("Audi3554"). It offers solid structure, sharp queenside counterplay, and strong surprise value — perfect for creative players who enjoy complex, positional battles. ■ Main Line 1. c4 d6 2. e3 Nd7 3. Nc3 b6 4. d4 Bb7 5. e4 e5 6. d5 Be7 7. Nf3 Ngf6 8. g3 O-O 9. Bg2 a6 10. O-O