Blockade
A blockade is the plan of stopping an enemy pawn by occupying the square it must move to next, most often a passed or isolated pawn, with a piece that stays safe and useful there.
A pawn that cannot step forward cannot become a queen. Blockading means putting one of your pieces on the square in front of the pawn and keeping it there, so the pawn is held by a body instead of by tactics. Aron Nimzowitsch made the idea central to his teaching, and he stressed which pawns deserve it: passed pawns, which no enemy pawn can stop, and isolated pawns, whose neighbors cannot support a push.
Knights make the best blockaders. From the blockade square a knight still attacks several important squares, while a bishop that stands in the path of a pawn sees much less, and a rook is happier on an open file. A queen should not be tied to the job.
A good blockade does two jobs at once. It freezes the pawn and it places your piece on a strong central square, where the pawn itself shields it from some attacks. The frozen pawn then becomes a target, and its owner may have to defend it with pieces.
Before you commit, check that no enemy pawn can chase the blockader away, and that the piece has other work besides guarding the square. Otherwise a pawn lever or a single exchange can set the pawn free.
Compare it with Isolated queen's pawn structure. A structure in which one side has a pawn on d4 (or d5) with no friendly pawns on the c- or e-files, giving active pieces and attacking chances but a long-term weakness in endgames.
It sits close to 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.
It sits close to Stonewall structure. A pawn formation with pawns on c6, d5, e6 and f5 (for Black) or c3, d4, e3 and f4 (for White) that builds a solid wall controlling e5 or e4 but leaves the light-squared bishop passive.
Strategic ideas such as "Blockade" 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
A passed pawn has a clear road to promotion as far as enemy pawns are concerned: none stands ahead of it on its own file or the two neighboring files, so the opponent must spend a piece or the king to stop it.
An isolated pawn is a pawn with no friendly pawn on either neighboring file, so no other pawn can ever defend it and the square in front of it is a lasting weakness.
An outpost is an advanced square, usually in the opponent's half of the board, that is protected by one of your own pawns and cannot be attacked by an enemy pawn.
Restriction is a strategic technique of limiting the opponent's useful moves, pawn breaks and piece routes so their position has few constructive options, often by controlling key squares rather than winning material.
A protected passed pawn is a pawn that no enemy pawn can block or capture on its way to promotion and that has a friendly pawn diagonally behind it, ready to recapture if it is taken.
Isolated queen's pawn structure
A structure in which one side has a pawn on d4 (or d5) with no friendly pawns on the c- or e-files, giving active pieces and attacking chances but a long-term weakness in endgames.
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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