"‘[…] the chakravala method anticipated the European methods by more than a thousand years. But, as we have seen, no European performances in the whole field of algebra at a time much later than Bhaskara’s, nay nearly up to our times, equalled the marvellous complexity and ingenuity of chakravala.’"
January 1, 1970
https://en.wikiquote.org/wiki/Pell's_equation