It is a defense whose philosophy is that of passiveness.
Hedgehog defense
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And I play it as Black, the passivity is like holding a balance. Once White pushes for more, the balance is upset and what was once -- is now /, where White has perhaps more chances, but at the cost of giving Black chances. So you are right Black has temporary passiveness.
wtf hedgehog defence
it´s playable the hedgehog defense or it´s too pasive