Hedgehog

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

The Hedgehog is a pawn formation in chess adopted usually by Black that can arise from several openings. Black exchanges the pawn on c5 for White's pawn on d4, and then places pawns on the squares a6, b6, d6, and e6. These pawns form a row of "spines" behind which Black develops their forces.

Excerpt from the Wikipedia article “Hedgehog (chess)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia