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BuilderQ: Yes, the 3rd castling was a mistake that none of the opponents spotted (or maybe one did !). Similarly, in the 250-moves game between the two maniacs, there was actually the same position repeated 3 times but they did not realize it ... (someone was brave enough to go through the game andfound out) :-)
(kaŝi) Atendante vian vicon, klaku "ŝanĝi" apud la vorto "Reŝarĝi" sur la ĉefpaĝo, poste ŝanĝu "Regenera periodo ..." al ekz. 30 sekundoj por ke via vico estu montrata pli rapide. (Servant) (Montri ĉiujn konsilojn)