Jonathan Schrantz teaches the Marshall Attack (sometimes seen as a gambit) in the Ruy Lopez. Black gives up a center Pawn to create weaknesses. See the original game where it failed, then see a modern improvement on the idea.

2016.08.22
Jose Raul Capablanca vs Frank James Marshall, New York (1918): C89 Ruy Lopez, Marshall counter-attack
http://www.chessgames.com/perl/chessg...
Alexey Shirov vs Levon Aronian, 2nd Grand Slam Masters Bilbao Final (2009): C89 Ruy Lopez, Marshall, main line, Spassky variation
http://www.chessgames.com/perl/chessg...