Strong center
A strong center is a set of pawns and pieces holding the central squares, usually d4, e4, d5 and e5, so your own pieces gain room and influence while the opponent is cramped.
The four central squares sit at the crossroads of the board, so a piece placed there reaches both wings quickly. A strong center usually means pawns planted on d4 and e4 (or d5 and e5 for Black) that are well supported by pieces, not merely pushed forward. Those pawns take away squares from the enemy knights and bishops, which leaves the opponent short of good posts and makes it harder to organize an attack. It also helps your own forces: a knight on a protected central outpost can reach either wing in a couple of moves, and a bishop on an open diagonal can switch wings in one. Many classical openings are built around this idea, and the opposite approach, letting the opponent build a center and then attacking it with pawn breaks and pieces, is just as valid when handled carefully. The usual mistake is overextending. Advancing central pawns without enough support gives the opponent a target, and a center that cannot be defended turns into a liability. Before committing to a big pawn center, count how many pieces defend it and ask which pawn break your opponent will use against it. A center is strong when it is stable, supported and useful, not simply when it looks imposing.
It sits close to Grunfeld structure. A structure where White builds a big pawn center on c3, d4 and e4 while Black attacks it with pieces and the pawn break ...c5, relying on the bishop on g7 and quick counterplay.
Also worth reading is Overprotection. Overprotection is the practice of guarding an important pawn, square or piece more times than the opponent's threats demand, so the point is rock solid and the guarding pieces can take useful posts around it.
Also worth reading is Center control. Center control means influencing the central squares d4, d5, e4 and e5, with pawns, pieces or both, so that your forces move freely and the opponent has less room to operate.
Strategic ideas such as "Strong center" show up in your games as small decisions, move after move. A first lesson with George Li reviews those decisions and turns them into a study plan.
Related terms
Center control means influencing the central squares d4, d5, e4 and e5, with pawns, pieces or both, so that your forces move freely and the opponent has less room to operate.
A pawn center is a group of one or more pawns, most often on d4 and e4 or d5 and e5, that occupies the central squares and takes space from the opponent.
A space advantage means controlling more squares, usually through advanced pawns, so that your pieces have room to maneuver while the opponent has little room and finds it hard to exchange or regroup.
A fluid center is a central pawn setup that stays unfixed and flexible, with neither side committing to a locked structure, so pawn breaks and piece placement can still change the character of the game.
A central break is a pawn advance or exchange in the middle of the board, usually on the c, d, e or f files, that challenges the opponent's central pawns and opens lines for pieces.
Guides that go further
What to decide first, the questions to ask, what a first lesson should show and the red flags to avoid.
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A game review, a read on your level and a written study plan from George Li.
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A first lesson starts with your games: George reviews them and builds a study plan around what he finds.