24. Chess endgame tablebases online

1. http://chessok.com/?page_id=361
2. http://www.shredderchess.com/online-chess/online-databases/endgame-database.html
3. http://www.k4it.de/?topic=egtb&lang=en
4. http://www.lokasoft.nl/tbweb.aspx

Longest direct checkmates: http://kirill-kryukov.com/chess/longest-checkmates

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