Problems at: <21...?>, <22...?>, big hash needed. J Arnason vs Nunn, 1990  (C84) Ruy Lopez, Closed, 26 moves, 1-0 Rybka gets confused in the Rc2 line (see RV's post on page 1). Yusupov vs J Nogueiras, 1985  (D43) Queen's Gambit Declined Semi-Slav, 20 moves, 1-0 Decision between Bd3 and Ba4 is not at all clear to engines. G Kuzmin vs A Choudhary, 1984  (C77) Ruy Lopez, 33 moves, 1-0 Best lines for black's 33rd move need very deep analysis. Janowski vs Schlechter, 1899  (C78) Ruy Lopez, 36 moves, 1-0 See the zenpharaohs response to patzer2 re: 22th move for black P Popovic vs M Lazic, 1993  (C92) Ruy Lopez, Closed, 29 moves, 1-0 Takes Hiarcs 17 plies and 50 CPU minutes to figure out 14.Rd8 Anand vs Robatsch, 1992  (C10) French, 20 moves, 1-0 It seems that Rybka 3 has some serious problems with this game. G Vescovi vs R Szuhanek, 1994  (B53) Sicilian, 27 moves, 1-0 Hiarcs does not find 19.Bxh6 even after 30m CPU, 17 plies. Serper vs Barsov, 1988  (C05) French, Tarrasch, 25 moves, 1-0 Long time to decide between 19.Nd4/19.Rd6 Spassky vs Larsen, 1978  (B18) Caro-Kann, Classical, 21 moves, 1-0 17.Bf6 is very difficult to find for engines. Spassky vs V Korensky, 1973  (B65) Sicilian, Richter-Rauzer Attack, 7...Be7 Defense, 9...Nxd4, 28 moves, 1-0 All strong engines fail to find 44. Rxf6. But Crafty does !??! F Olafsson vs Unzicker, 1970  (D41) Queen's Gambit Declined, Semi-Tarrasch, 47 moves, 1-0 11 games