Yermolinsky A. "Chess Explained: The Classical Sicilian" (K-576)

The O’Kelly variation of the Sicilian Defence (1 e4 c5 2 Nf3 a6) is a wonderful system for those who enjoy playing Sicilian positions but don’t want to get bogged down in heavy theory. The O’Kelly relies far more on an understanding of general strategic ideas and middlegame planning than on rote memorisation of opening moves. One of the benefits of the O’Kelly is that White’s natural continuation of 3 d4, although very frequently played, permits Black confortable development and an easy game.

The Caro-Kann Defence arises after the moves 1 e4 c6. With this first move Black (as is also the case with the French Defence - 1 e4 e6) plans 2 ... d5, establishing a well-protected central pawn. The Caro-Kann has a reputation as a rock solid defence that minimises the risk of Black being subjected to undue early pressure. Rather than inviting the opponent to engage in immediate warfare, Black focuses on completing development comfortably and postponng the serious battle until the middlegame. It is notable that the White systems which try to batter the Caro-Kann into early submission are highly double-edged and often rebound badly.