Exchange sac sets tone for GOOD S Bouaziz vs D Kopec, 1978 (B53) Sicilian, 52 moves, 0-1 good opening preperation D Kopec vs de Firmian, 1985  (A46) Queen's Pawn Game, 29 moves, 1-0 Good example of a positional and tactical clash in one game Shirov vs Z Kozul, 2005  (B67) Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7, 73 moves, 1-0 nice example of zugzwang Korchnoi vs Huebner, 1980  (A30) English, Symmetrical, 39 moves, 1-0 4 games