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I double-checked my data set to look into this, and you're right. Nearly all of the Pircs in that time period were done by a guy named Moheschunder Bannerjee: https://en.wikipedia.org/wiki/Moheschunder_Bannerjee

He contributed to the development of the Indian Defence.

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Why do you all have your own datasets of historical chess moves? Is this a popular playground for data analysis, or is it something chess learners study?

It's something chess players study. Check out database.chessbase.com

Chess compresses very well. You can fit pretty much every meaningful game ever played into 10gb or so.

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