Understand the opening.
Then punish it.
Each study walks you through an opening on a live board: the ideas, the main variations and what they lead to, and the mistakes players actually make at 1300, 1600 and 2000+. For the raw numbers, see opening mistakes by rating.
21 studies
Sicilian Defense B20–B99For BlackBlack refuses to mirror 1.e4 and fights for the centre from the side. Unbalanced from move one, which is exactly why it rewards the better-prepared player.9% of players rated 1200–1400 play 3...e6?
Italian Game C50–C59For WhiteThe oldest developing scheme in chess: knight, knight, bishop, aim the pieces at f7 before deciding what to do with the centre.10% of players rated 1200–1400 play 4...Bc5?
French Defense C00–C19For BlackBlack lets White build a big pawn centre, then strikes it from the side with ...c5 and ...f6. Solid, resilient, and famous for one persistent problem piece.20% of players rated 1200–1400 play 3...Nc6?
Queen's Gambit Declined D06–D69For BlackBlack keeps the extra centre pawn and accepts a slightly passive but rock-solid structure. One of the most respected and deeply analysed defences in all of chess.88% of players rated 1200–1400 play 3...Qxd5?
Ruy Lopez C60–C99For WhiteThe oldest fully respectable way to meet 1...e5: pin the defender of e5, castle, and press for a small, lasting edge that has produced more grandmaster games than any other opening.10% of players rated 1200–1400 play 5...Nf6?
Caro-Kann Defense B10–B19For BlackBlack supports the centre with the c-pawn instead of the knight, solving the French Defense's classic bishop problem before it even arises.4% of players rated 1200–1400 play 4...c5?
King's Indian Defense E60–E99For BlackBlack lets White build the 'ideal' pawn centre on purpose, fianchettoes the bishop, and then attacks that very centre from the flank — hypermodern strategy at its sharpest.
Slav and Semi-Slav Defense D10–D19, D43–D49For BlackBlack supports d5 with the c-pawn instead of the e-pawn, so the light-squared bishop stays free; add ...e6 and you have the Semi-Slav, one of the richest defences in chess.
Scotch Game C44–C45For WhiteWhite grabs the centre with an immediate d4, trading a pawn for open lines and quick piece activity instead of the slow build-up of the Ruy Lopez or Italian.9% of players rated 1200–1400 play 4.Ng5?
King's Gambit Accepted C33–C39For WhiteWhite offers a pawn on move two for open lines, fast development, and a direct attack on Black's king — the boldest way to start a game of chess.8% of players rated 1200–1400 play 3...Bc5?
Scandinavian Defense B01For BlackBlack hits e4 on move one and forces an open game at once: a lost tempo for the queen, in return for a clean, Caro-Kann-like structure and no theory-heavy pawn centre to fight.20% of players rated 1200–1400 play 5...Qg6?
Pirc and Modern Defense B06–B09For BlackBlack lets White build a full pawn centre, fianchettoes the king's bishop and then attacks that centre from the side. Flexible, risky and rich.3% of players rated 1200–1400 play 3.Bxf7+?
English Opening A10–A39For White1.c4 fights for d5 from the side: a flexible, positional opening where White usually fianchettoes, plays a Sicilian with an extra tempo, and wins games with pressure on the long diagonal and the d5 square.
Petrov's Defense C42–C43For BlackBlack answers 2.Nf3 by counterattacking e4 instead of defending e5: the most solid defence to 1.e4 at the top level, and, with the Stafford Gambit, one of the trickiest at club level.36% of players rated 1200–1400 play 3...Nc6?
Nimzo-Indian Defense E20–E59For BlackBlack pins the c3 knight, stops e2-e4 and is ready to give up the bishop pair for doubled white pawns: the most respected answer to 1.d4 c4 Nc3, played by every world champion since Capablanca.
Four Knights Game C46–C49For WhiteBoth sides bring out both knights before anything else: the most natural opening in chess, with a quiet reputation and a surprising number of tricks.3% of players rated 1200–1400 play 4.Nxe5?
Philidor Defense C41For BlackBlack defends e5 with the d-pawn and builds a compact wall. Solid and light on theory, but the first six moves are full of traps on f7.58% of players rated 1200–1400 play 6...Nf6?
Vienna Game C25–C29For WhiteWhite develops the queen's knight first and keeps f2-f4 in reserve: a King's Gambit with better timing, or a quiet Bc4 and d3 setup, depending on what Black shows.18% of players rated 1200–1400 play 3...Nc6?
Queen's Gambit Accepted D20–D29For BlackBlack takes the c4 pawn, not to keep it but to give the centre away for a moment and then hit it with ...c5 and ...e5. Free development, no bad bishop, a fair fight.7% of players rated 1200–1400 play 3...Bf5?
London System D00–D02, A45–A48For WhiteOne setup against almost everything: d4, Bf4, e3, c3, Nf3, Nbd2 and Bd3. Easy to learn, very solid, and far more dangerous than its quiet reputation once the knight lands on e5.
Englund Gambit A40For BlackBlack answers 1.d4 with a pawn sacrifice on move one. Unsound against good play, deadly against routine moves: learn the traps and their refutation.45% of players rated 1200–1400 play 5.dxe7?