Ruy Lopez

The Ruy Lopez has been the main test of 1...e5 for over a century — used by nearly every World Champion — because 3.Bb5 pins the knight defending e5 without committing to anything else yet. It's the opening with the deepest body of theory in chess, which scares beginners off but rewards anyone willing to learn it in stages.

1.e4 e5 2.Nf3 Nc6 3.Bb5. Black's main reply is 3...a6, asking the question immediately: retreat (4.Ba4, the main line) or trade (4.Bxc6). Learn the Closed Ruy Lopez (4.Ba4 Nf6 5.O-O Be7) first — it covers most games you'll actually face.

In the main Closed line, White plays c3 and d4 to build a big center, then often reroutes the b1 knight via d2-f1-g3 toward the kingside while Black expands with ...b5 and ...Bb7 or ...Bg4 pressure on the center. Whoever breaks the center at the right moment (d4-d5 for White, ...exd4 or ...d5 for Black) usually gets the better position.

Don't play 4.Bxc6 dxc6 5.Nxe5?? expecting a free pawn — 5...Qd4 forks the knight on e5 and the pawn on e4, winning material back immediately. If you do want to damage Black's structure, the Exchange Variation (4.Bxc6 dxc6) is a legitimate long-term plan (bishop pair vs. better pawns), not a way to win a pawn outright.

White's most common mistake is releasing the central tension with an early d4-d5 push before the pieces are ready to exploit the extra space, handing Black a free ...c6/...c5 break later. Black's most common mistake is delaying ...b5 and ...Bb7 too long, letting White finish the knight maneuver to g3 and build a kingside attack unopposed.