💡 黒が早い段階でd5を突き、ポーンを犠牲にして中央を活性化させる珍しい戦法。奇襲性が高く、準備不足の相手に有効。

💡 Black pushes d5 early, sacrificing a pawn to activate the center in this rare line. Its surprise value makes it effective against underprepared opponents.