The Paulsen-Nimtzowitch Variation. These two famous chess players were the first to implement this blockading plan for White. Nowadays, GM Sveshnikov is the main expert in this variation.

• 保尔逊-尼姆佐维奇变例。白棋的这个封闭性计划是由这两位著名的大师首先提出的。现在，象棋大师斯维什尼科夫是这一变例的专家。