According to Wikipedia: “The Brisker method, or Brisker derech, is a reductionistic approach to Talmud study innovated by Rabbi Chaim Soloveitchik of Brisk, as opposed to the traditional approach which was rather holistic. It has since become popular and spread to yeshivas around the world. The Brisker method is also known as the “conceptual” approach to Talmud study, and is often referred to simply as lomdus (lit. “analytical study”).”
In his first lecture on R. Chaim Ozer Grodzinksi for Torah in Motion, history professor Marc B. Shapiro says: Eliezer Berkovitz did not teach the Brisker method. He focused on pshat (plain meaning), on halachic rulings.