How to evolve human/animal hands

Short question, what events would induce the evolution from hands of 4 fingers and 1 thumb into hands of 2 fingers and 1 thumb like the hands of Yoda in Start wars?Would be 2 thumbs and 1 finger be better?

Between it's not necessarily related to humans, but I'm also interested more in wild animals too.

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How to evolve human/animal hands

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