Well this is no fun. On Wednesday, the Major League Baseball Rules Committee voted to eliminate collisions at home plate during baseball games. The decision is now up to the players, and if they vote it down it won't go into effect until 2015. The rule, which is not yet written, stipulates that catchers cannot block home plate, while runners cannot initiate contact with catchers and must slide into home plate. Recent injures and research into concussions sparked this change.
