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How this site is actually built, what we've gotten wrong along the way, and how we caught it. Newest first.
1...d6 or 1...g6? What about 63 million Pirc and 54 million Modern Lichess games show about White's replies, where the two openings transpose, and which one suits your style.
Is 1...Nf6 a sound answer to 1.e4? What about 29 million Lichess games show about White's main tries, from the Exchange and Four Pawns to 2.Nc3, and who the Alekhine suits best.
Is 3.d4 a serious weapon against 1...e5? What about 73 million Lichess games show about Black's replies, the popular 4...Nxd4 trade, the Classical 4...Bc5, and why the Scotch needs less theory than the Ruy Lopez.
Is the Vienna Game a good opening for beginners? The calm 2...Nc6 setup, the Vienna Gambit, the 4...Qe7 trap and the Elo range we recommend. Backed by about 64 million Lichess games.
Is 2.Bc4 a good way to meet 1...e5? How the Bishop's Opening sidesteps the Petroff, when it transposes to the Italian, and what Black plays. Backed by about 143 million Lichess games.
Is the Catalan a good opening for club players? What it asks of you, Black's three main replies, the Open Catalan pawn offer and who should wait. Backed by about 940,000 Lichess games.
Is the Benko Gambit sound or just a club trick? What Black gets for the pawn, how White tries to hold it or decline it, and who should play it. Backed by about 3.4 million Lichess games.
What the London System is, how 400 to 1400 players meet it in about 35 million Lichess games, and practical anti-London plans: ...c5 with ...Qb6, ...Nh5, the ...Bd6 trade, a King's Indian setup and the ...Nb4 trick.
Why 2...dxc4 doesn't really win a pawn, how the Accepted and the classical Declined differ, and which one suits your style. Built from about 41 million and 177 million Lichess games.
Both start 1.d4 Nf6 2.c4 g6, then split on move three. How the King's Indian and Grünfeld differ in plans, theory and recommended rating, built from about 183 million and 4.9 million Lichess games.
2...c6 or 2...e6? How the Slav and the Queen's Gambit Declined differ on the light-squared bishop, pawn breaks and White's main systems, built from about 26 million and 177 million Lichess games.
Is 1...f5 sound? The Classical, Stonewall and Leningrad setups, the Staunton Gambit and the Bg5 trap to avoid, and who the Dutch suits. Built from about 16 million Lichess games.
Three low-theory 1.d4 systems compared: how Black actually replies to the London, Torre and Trompowsky on Lichess, who each one suits, and how they fit together.
How the Nimzo-Indian, Queen's Indian and Bogo-Indian fit together, why White's 3.Nf3 forces you to pick a partner for the Nimzo, and what Lichess games at club level say about each.
The trap-rich openings that work best when the clock is short: the Vienna, Italian, Danish, King's Gambit, Ponziani and Budapest, ranked for bullet and blitz with trap statistics from millions of Lichess games.
How Scholar's Mate works (1.e4 e5 2.Qh5 Nc6 3.Bc4 Nf6?? 4.Qxf7#), the moves that stop it, the defense that loses a pawn, and how Black chases the queen to win time.
The Fried Liver Attack move by move (1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7), the plans for both sides, Black's safer 5...Na5, and the Traxler counterattack.
The Stafford Gambit PGN (1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6), the three traps White must avoid, and a clean, low-theory refutation that keeps the extra pawn. Every line checked move by move.
A practical Black repertoire against 1.e4 e5 2.f4: the modern 3...d5 that gives the pawn back for development, the 2...Nc6 and 2...Bc5 declines and their Qh4+ trap, and the Falkbeer. Built from about 78 million Lichess games.
How White beats the Englund Gambit (1.d4 e5), including the Qb4+ trap that ends in mate on c1, plus quick answers to the Budapest and Albin Countergambit traps. Every line checked move by move.
The best chess openings for 1200 to 1800 players, for White and Black, picked from the 21 openings in our library whose recommended range covers the whole band. With Lichess game counts and move data.
The chess openings with the least memorization, for White and Black: the London, Torre, Alapin and Ponziani, plus the Scandinavian and Pirc. Line counts and Lichess move data from our library.
The most aggressive chess openings for White, from the Danish Gambit and King's Gambit to the Yugoslav Attack, Vienna, Scotch and Trompowsky. Ranked with Lichess move data for each one.
How many chess openings you need for White and Black, by rating: one White system, one answer to 1.e4, one answer to 1.d4. With line counts from our 36-opening library.
How to choose a chess opening repertoire that fits your style: aggressive, positional, solid or flexible. Every opening in our 36-opening library sorted by style and Elo range.
The five opening principles that matter most for beginners, when they bend, and the move-order rules our openings add on top, checked against about 394 million Lichess games.
Principles first, then a small set of lines you understand. What that looks like in practice, using line counts and move splits from about 264 million Lichess games.
What the words in chess opening names actually tell you, with examples from our library: the Italian, the Caro-Kann, the King's and Danish Gambits and the London System.
A simple three-question check for when your opponent leaves the book early, two classic examples, and what about 324 million Lichess games say about how often rare moves turn up.
Transposition means reaching the same position by a different move order. Verified examples from our Alapin, English, Reti and London data, and how to use move orders on purpose.
How many moves of opening theory you actually need, measured across all 613 lines in our library: median depth, the deepest lines, and why width matters as much as depth.
1.c4 or 1.Nf3? The English and the Réti compared: move orders, Black's most common replies, how to play the Réti step by step, and who each one suits. Backed by 152 million Lichess games.
Is the English Opening (1.c4) a good choice for beginners? What makes it easy, what makes it hard, the simplest setup to learn, and the Elo range we recommend. Backed by 147 million Lichess games.
The King's Indian Attack explained: the Nf3, g3, Bg2, d3, e4 setup, the e5 push and kingside attack against French-style defenses, Black's counterplay, and how to start playing it.
The Nimzo-Larsen (1.b3) and Bird's Opening (1.f4) explained: are they sound, what setups they aim for, and how to survive From's Gambit (1.f4 e5), the trap every Bird player must know.
Your two real choices against 1...c5: the Open Sicilian or the Alapin (2.c3). What each one asks of you, backed by about 45 million Lichess games from our Sicilian trainers.
The Open Sicilian and the Alapin compared side by side: pawn structures, plans, how much you need to memorize, and who each one suits. Backed by about 45 million Lichess games.
What the Maróczy Bind is, how White sets it up with pawns on c4 and e4, the plans that keep Black cramped, and the breaks Black is waiting for. With PGN lines.
The Italian Game and the Ruy Lopez compared for intermediate players: plans, theory load, what Black plays against each, and which to learn first. Backed by about 189 million Lichess games.
White's main weapons against the French Defense, why the Advance Variation (3.e5) is the most practical, and the plan, move frequencies and trap you need. Built from about 30 million Lichess games.
...c5, ...f6 and the ...c4 lock: when Black should play each break in the French Advance, what it does to White's pawn chain, and how often each line appears in about 30 million Lichess games.
The structural reasons the Caro-Kann is one of the safest answers to 1.e4, what Black gives up for that safety, and what about 37 million Lichess games show about how White tries to crack it.
A practical White plan against the Caro-Kann: the Advance Variation with the Short System, what Black plays in about 24 million Lichess games, and how to punish the ...Qb6 pressure.
Does the early queen move really lose? What about 94 million Lichess games show about how White meets 3...Qa5, where the Scandinavian holds up, and where stronger opponents make it uncomfortable.
Where the Petroff's drawish reputation comes from, what about 98 million Lichess games show about how symmetrical it really stays, the sharp lines White can choose, and the trap that punishes copying.
Nine 1.d4 defenses for Black compared with Lichess data: what club players actually play against each one, recommended Elo ranges and trainer lines.
A genuine, documented trap that 70% of 600 to 1500 rated players fall into against the Ponziani Opening, verified against about 12 million Lichess games.
A move-by-move defensive guide for Black against the Danish Gambit, built from about 17 million Lichess games at 900 to 2000.
The 1918 upset that put the Budapest Gambit on the map, checked against about 8.1 million Lichess games to see if it still holds up in real practical play.
Fischer's 1961 King's Gambit 'bust' claim, checked against about 78 million Lichess games, where his own recommended defense is just one of six common replies.
Real gambits and tactical traps checked against this site's Lichess data, from about 8.1 million to 78 million games per opening, no unverified claims.
Why the Sicilian Najdorf's recommended range starts at 1600 Elo, based on how many different White systems its Lichess data throws at you, plus five lower-rated 1.e4 alternatives.
What is the best defense against 1.e4? Seven reliable options for Black, compared by rating range, style and real move data from about 391 million Lichess games.
Five White openings whose recommended range covers 1200 to 1500 Elo, built from what players at each opening's rating range actually play on Lichess, with move frequencies for each.
Move-frequency data and Elo suitability across all 36 openings on this site, built from what players at each opening's rating range actually play on Lichess.
Sometimes an opening is chosen for one specific opponent, not for its own merits. Two real games where it worked, and one where it didn't.
One pawn move decides whether Black's light-squared bishop works for the rest of the game. How five different openings handle the same problem.
The London System's four most common mistakes are really one mistake: running a memorized setup instead of reading the position in front of you.
The four most common Italian Game mistakes at club level come from misreading its quiet reputation, in both directions. What the opening actually asks of you.