Lasker Morris is a variant of traditional "9 Men's Morris". Each team has ten stones instead of nine. And, the more important difference: The players do not have to drop all stones in the beginning. Instead, dropping and moving may happen in arbitrary order.
Former chess world champion Dr. Emanuel Lasker proposed "Lasker Morris" in his 1931 book "Brettspiele der Voelker" (Board Games of the People) to make "9 Men's Morris" more attractive. In his modesty, Lasker let his game without a name. The terms "Lasker-Muehle" (in German) and "Lasker Morris" (in English) were coined much later.
 
Lasker Morris is much more tight than traditional Morris. Especially, the second player no longer has an advantage. Lasker Morris was solved in winter 2002/2003 by Peter Stahlhacke, using retrograde analysis with 120 GigaByte of disk space and about 100 days runtime on a modern PC. The game is a draw. However, the paths of correct play are much narrower than in traditional "9 Men's Morris".
 
This zrf is an adaption of Karl Scherer's nice zrf "German Morris".