Lesson from Marshall: {R vs P} Marshall vs Duras, 1912  (D20) Queen's Gambit Accepted, 55 moves, 1/2-1/2 Lesson from GM Svidler: {Q vs R} Gelfand vs Svidler, 2001  (E06) Catalan, Closed, 5.Nf3, 129 moves, 1/2-1/2 Lesson from Heinrich Wolf: Opposition {2p vs p} Marshall vs H Wolf, 1905  (D50) Queen's Gambit Declined, 60 moves, 1/2-1/2 {R+p vs R+p} Stahlberg vs Tartakower, 1937  (A50) Queen's Pawn Game, 60 moves, 1/2-1/2 4 games