Hedgehog

The Hedgehog is a compact setup in which one side, usually Black, places pawns on a6, b6, d6, and e6 and arranges the pieces behind them. In a square name such as a6, the letter marks a vertical file and the number a horizontal rank. The pawns resemble a hedgehog's spines, which gives the structure its name.

The Hedgehog concedes space, allowing the opponent to advance pawns and control more squares. In return, the compact position avoids immediate structural damage and stores energy for two typical pawn breaks, b5 and d5. A pawn break opens lines or changes the structure. At the right moment, it can suddenly release pieces that previously looked passive.

What each side must judge

• The Hedgehog player must coordinate the pieces and prepare a break before becoming completely restricted.
• The d6-pawn can become a fixed target if it cannot advance.
• The side with more space should improve the pieces without allowing a favorable b5 or d5 break.
• Opening the position too early can help the Hedgehog because its pieces are often ready to use the new lines.

The Hedgehog often appears against the Maróczy Bind, where opposing pawns on c4 and e4 restrain the b5 and d5 breaks. It is not merely passive. Its strategy, the long-term objective, is to contain, provoke advances, and free the position at the right moment. The plan, the concrete sequence of actions used to pursue that objective, coordinates the pieces and prepares the right break.