411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Ba4/4...d6/5. c3
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Ruy Lopez, Deferred Steinitz, 5. c3
One of the main lines against the Deferred Steinitz! White prepares to build an ideal pawn center with c3, looking for d4. Black has several ways to combat this move.