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The civilisation's sudden collapse has also been hotly debated.
Mooted causes include disease, foreign invasion and deforestation or climate change that led to a prolonged, devastating drought.
The estimate closely matches that of a decades-old benchmark for Mayan dating, the so-called Goodman-Martinez-Thompson method.
According to the Goodman-Martinez-Thompson estimate, the big victory occurred around AD 695-712.
"Jasaw Chan K'awiil's defeat of Calakmul followed a series of great wars between Tikal, Calakmul and Dos Pilas between AD 657 and 677 that resulted in the defeat of Nuun Ujol Chaak," it says.