Playing a pickup game this weekend on turf -- there was a thin layer of ice sitting maybe half an inch below the top of the "grass" from some light snow over the previous couple days melting/refreezing. It broke as soon as you stepped on it, and studs went right through and easily gripped the pellets below. Of course the ice pieces then remained in the turf. We were all out to play, and it was pickup so no problem, but it made me think about what I would have done if I were refereeing a match on it. Obviously it's ITOOTR, but would the fact that studs could still grip the turf be enough for you to go ahead with the match, or would the fact that there is ice on (in?) part of the pitch make you decide to call it off?