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tromp | karma 9374 | avg karma 3.0 · 2021-09-05 13:19:38

To quote from Seinfeld: "It's not you. It's me"

I missed something, and clearly misclassified this position, leaving only 51 legal in the 1k set (and only 537 in the 10k set).

Oops. It's embarrassing since I did pay attention to the en-passant positions in the 919-93 positions not from the smaller 1k sample, such as this one: https://github.com/tromp/ChessPositionRanking/issues/916

I'll have to make some changes to my README. Meanwhile, congratulations on spotting the error. And I'll be sure to mention you in the eventual publication.

This underscores the need to back up my classification with proof games...

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tromp | karma 9374 | avg karma 3.0 · 2021-09-05 16:02:14

As I went to look for the corresponding issue, I was surprised to not find the position among the open issues.

In fact it was closed as

https://github.com/tromp/ChessPositionRanking/issues/915

So I had classified it correctly, but only AFTER making the diagrams for the 1k sample.

That means the 538 count for the 10k sample still stands. Good. Less things to fix on the README :-)

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tromp | karma 9374 | avg karma 3.0 · 2021-09-06 11:16:09

A misclassified issue was found by Github user 1pab42 at https://github.com/tromp/ChessPositionRanking/issues/878

That changes the prospective number of legal positions to 539...

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tromp | karma 9374 | avg karma 3.0 · 2021-09-08 15:12:21

But just today github user @mcdallas found another position misclassfied as legal [1], so the two misjudgements cancel out and the original 538 count currently still stands. Lovely:-)

[1] https://github.com/tromp/ChessPositionRanking/issues/794

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tromp | karma 9374 | avg karma 3.0 · 2021-09-12 11:00:28

Peter Osterland found yet another misclassification in

https://github.com/tromp/ChessPositionRanking/issues/824

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tromp | karma 9374 | avg karma 3.0 · 2021-09-18 17:12:37

And another at https://github.com/tromp/ChessPositionRanking/issues/476#iss...

tromp | karma 9374 | avg karma 3.0 · 2021-09-19 02:51:37

And another at https://github.com/tromp/ChessPositionRanking/issues/111

tromp | karma 9374 | avg karma 3.0 · 2021-09-22 16:30:54

And yet another at https://github.com/tromp/ChessPositionRanking/issues/186

tromp | karma 9374 | avg karma 3.0 · 2021-09-23 02:15:52

Github user @Ananas1729 (Ben Jones) found another at https://github.com/tromp/ChessPositionRanking/issues/243