Are all Black's sacrifices sound? V Moskalenko vs Yermolinsky, 1981  (D97) Grunfeld, Russian, 15 moves, 0-1 a forceful Black win with 5...Be6 against 5.Qb5+ Svidler vs Gelfand, 2014  (D81) Grunfeld, Russian Variation, 25 moves, 0-1 2 games