1. Ruy Lopez-The Ruy Lopez (also known as the Spanish Opening) is a chess opening enjoyed by chess players from complete beginners to the world champion, Magnus Carlsen!
2. The Slav Defense- The Slav Defense is a solid opening for Black in response to White's Queen's Gambit (1.d4 d5 2.c4). Black fights for equality against one of White's most popular openings without creating a bad light-squared bishop—one of the downsides of other defenses like the French Defense and the Queen's Gambit Declined.
3. Sicilian Najdorf- The Najdorf Variation of the Sicilian Defence is one of the most popular, reputable and deeply studied of all chess openings. Modern Chess Openings calls it the "Cadillac" or "Rolls-Royce" of chess openings.
4. Vienna- White's second move is less common than 2.Nf3, and is also more recent.The original idea behind the Vienna Game was to play a delayed King's Gambit with f4 (the Vienna Gambit), but in modern play White often plays more quietly.