Kriegspiel (chess)
Wayback Machine - Wikipedia
https://en.wikipedia.org/wiki/Wayback_Machine11th Computer Olympiad 2006 rules
https://web.archive.org/web/20071123081716/http://www.cs.unimaas.nl/olympiad2006/rules.htmlOops - Maastricht University
http://www.cs.unimaas.nl/olympiad2006/rules.html#Kriegspiel