Other positions, long believed to be won, turned out to take more moves against perfect play to actually win than were allowed by chess's fifty move rule. As a consequence, for some years the official laws of chess were changed to extend the number of moves allowed in these endings. After a while, the law reverted back to fifty moves in all positions — more such positions were discovered, complicating the rule still further, and it made no difference in human play, as they could not play the positions perfectly.

其他的盘面，很长时间人们相信可以赢，不过要花比50步自然限着更多的步数才可以赢，在对手走得非常精确的时候。这导致正式的棋规修改成：在这些残局出现时允许更长的限着，这种棋规生效好几年。过了一段时间，规则又改回到所有的盘面都为50步自然限着。原因是，更多这样的残局被发现了，把规则搞得越来越复杂是不希望的，而且改后的规则和之前的在人类比赛中没有区别，因为人不可能下得非常精确。

Over the years, other endgame database formats have been released including the Edward Tablebases, the De Koning Endgame Database (released in 2002) and the Nalimov Endgame Tablebases which is the current standard supported by most chess programs such as Rybka, Shredder or Fritz. All endgames with five or fewer pieces have been analyzed completely. Of endgames with six men all positions have been analyzed except for positions with five pieces against a lone king [7]. Some seven-piece endgames, have been analyzed by Marc Bourzutschky and Yakov Konoval [8]. In all of these endgame databases it is assumed that castling is no longer possible.

在这些年里，其他残局库格式被发布了，包括Edward 表库，　De Koning 残局库(2002年发布)和　Nalimov 残局库，被当前大多数象棋程序所支持的标准，如Rybka,Shredder,Fritz。所有的五子残局和更少子的残局被完全分析透了。六子残局除了五子对单王的一些盘面以外，其他盘面都被分析过了。　一些七子残局，被Marc Bourzutschky 和 Yakov Konoval分析过了。　在这些残局库中，都假定王车易位不再可能出现。