It's explained here albeit vaguely: http://faculty.uml.edu/rmontenegro/research/kruskal_count/index.html http://faculty.uml.edu/rmontenegro/research/kruskal_cou

It's explained here albeit vaguely: http://faculty.uml.edu/rmontenegro/research/kruskal_count/index.html http://faculty.uml.edu/rmontenegro/research/kruskal_count/in... You start at the first card and progress until you would fall off the end on the next step. That card you're on is what you pick as the trap.