dabst1 wrote:
Anderssen's opening would probably be most passive.
You mean a3?
white : blackmar-diemer is aggresive, Colle is passive.
black : two-knights defense is active, caro is passive.
There are no passive openings. There are only openings that put aggression for later. 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 e6 11. Bf4 Qa5+ 12. Bd2 Bb4 13. c3 Be7 14. c4 Qc7 15. O-O-O Ngf6 16. Rhe1 b5 17. cxb5. Plus, there are players who will make any opening passive.
Anderssen's opening would probably be most passive.