The Norwegian Defence (also called the Wing Variation ), is an aggressive but time-consuming alternative for Black. The game follows 3...a6 4.Ba4 b5 5.Bb3 Na5. The goal of the opening is to eliminate the white bishop. A speculative sacrifice (Nightingale Gambit) is now 6.Bxf7+?!, which drives the black king out, but with accurate play, Black is supposed to be able to consolidate his extra piece.
The Lopez Grip (Part 3) - Chessville Article by Andrew Martin (Part 3 is completely about The Wing Variation.)
Ruy Lopez - Norwegian Defense - Chess.com Article by IM Jeremy Silman (Article is on the Speculative Sacrifice 6. Bxf7? Nightingale Gambit by White)
Sverre's Chess Corner Blog - Blog Posts by Norwegian Player Sverre Johnsen (and Author of THE RUY LOPEZ: A GUIDE FOR BLACK) on this Ruy Lopez Variation. (About 10 posts dealing with Different aspects of this Variation)
PGN Game Downloads
RuyLopezNorwegian.pgn - 696 Games
NightingaleGambit.pgn - 61 Games
More Work for Ken Regan?
1 day ago