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Two knights endgame
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=== Three knights === Three knights and a king can force checkmate against a lone king within twenty moves (unless the defending king can win one of the knights).<ref>{{Harvcol|Fine|1941|pp=5–6}}</ref> Also, a complete computational [[retrograde analysis]] revealed that they can force checkmate only on the edge of the board.<ref>{{cite web|url=https://bwinf.de/fileadmin/user_upload/BwInf/2018/37/2._Runde/Aufgaben/aufgaben372.pdf|title=37. Bundeswettbewerb Informatik 2018/2019: Die Aufgaben der 2. Runde, Aufgabe 3B|location=Bonn|date=2019|page=7|website=BWINF}}</ref><ref>{{cite web|url=https://bwinf.de/fileadmin/user_upload/BwInf/2018/37/2._Runde/L%C3%B6sungshinweise/loesungshinweise372.pdf|title=37. Bundeswettbewerb Informatik 2018/2019, 2. Runde: Lösungshinweise und Bewertungskriterien, Aufgabe 3|location=Bonn|date=2019|pages=37–46|website=BWINF}}</ref>
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