The Two Knights has been adopted as Black by many aggressive players including Mikhail Chigorin and Paul Keres, and World Champions Mikhail Tal and Boris Spassky.
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The resulting positions take on some characteristics of the Ruy Lopez if White plays c3 and retreats the bishop to c2 via Bc4–b3–c2.
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Some decades later, several Pennsylvania chess amateurs, (mainly K. Williams) analyzed the variation and decided to name it after their hometown Wilkes-Barre, Pennsylvania, so today 4..
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