For engine authors

[Graham Banks]

Since I started using 6 piece Syzygy tablebases a couple of days ago, I've come across two engines that lose with an illegal move message if the opponent takes a piece to leave a drawn 6 piece syzygy tablebase position.

Could you please check that your engine doesn't have this issue?

[Graham Banks]

Clover 3.3.1 is now fixed.

Uralochka 3.39d - still waiting for a fix.

Velvet 5.1.0 now loses on time without even reaching the tablebases stage. Author notified.

[smatovic]

Btw, I noticed you cleaned CCRL from about ~100 engines (Blitz Index), may I ask for the reason?

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Srdja

[Modern Times]

Btw, I noticed you cleaned CCRL from about ~100 engines (Blitz Index), may I ask for the reason?

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Srdja

The "about" section on the blitz list was clear. We switched to a 2+1 time control in January 2020. Instead of starting a brand new list from scratch, the approach was to add those games to the existing 40/2 list and run a blended list for a period of time, until we considered that we had enough games to split the lists, and that is what we have now done. Running a blended list having two time controls was not ideal, although we felt that in practice the ratings would not be significatory affected. It was a compromise to enable us to start a new list at a new time control without losing what we had. You will have noticed that there are now only 800k games on the current blitz list instead of nearly 3 million. There is a link to the now archived separate 40/2 list on the blitz page quite clearly if you look.

[smatovic]

Thx, clear, did not notice the Blitz Archive.

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Srdja