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Re:Sunfish: A simple but strong chess engine written in Python by bradknowles on Saturday June 01, 2019 @06:27PM (#20072087)
I’m curious how the code is sped up with pypy and why that helps?

What does pypy bring to this situation?

Re:Sunfish: A simple but strong chess engine written in Python by detaro on Saturday June 01, 2019 @06:31PM (#20072111)
PyPy is a JIT-based interpreter for Python - code that loops a lot over similar data structures is a natural candidate for being faster if jit-ed.