Here is the list of World Championship openings for black that has won classical matches. (rapid tie-breaks not included)
2. Steinitz vs Zukertort
You can search the ECO codes here: https://www.365chess.com/eco.php
Here is the list of World Championship openings for black that has won classical matches. (rapid tie-breaks not included)
2. Steinitz vs Zukertort
You can search the ECO codes here: https://www.365chess.com/eco.php