Does anyone know of a better video about the graph-game Sim than https://www.youtube.com/watch?v=Y6Lpl9Tq8yY ? I find it somewhat hard to follow; the black lines and red lines look somewhat similar to me, to the point where I could not readily assess whether one of the commenters was correct in asserting that a red K_3 gets inadvertently created at 1:50. Also, does anyone know of a better Sim simulator than http://www.cut-the-knot.org/Curriculum/Combinatorics/ThreeOrThree.shtml ? I can't get it to work, despite my efforts to circumvent Java security. Thanks, Jim Propp