William James Lombardy is an American Chess Grandmaster. He is the first American to win the World Junior Chess Championship. He also played for the US Team in the World Student Team Championship which was held in Leningrad, USSR in 1960. That was the first time the US Team won that event. Three times he won or tied for first in the US Open Chess Championship.
Miguel Quinteros is an Argentinian Grandmaster born in 1947. He played in 6 Chess Olympiads and won 2 Argentinian Chess Championships.
In a Sicilian Najdorf Lombardy sacrifices a knight. It is very intructive as it is a topical sacrifice in the Sicilian formation.