You have to read the Game Updates to get the answer to this and similar questions. See: http://firstlegoleague.org/challenge/robotgameupdates

28 - RATS AND CORN MALFUNCTION
Don't expect a benefit-of-the-doubt ruling if you gently push on a rat slide and the rat doesn't come down.  Even with a slide in perfect condition, you have to give that model an honest smack to get the rat's weight off the slide (lighten up, rat!), and guarantee its descent.  That's just the nature of the model, and all correctly built models behave the same.  However, it is well known by now that the rat slides and corn harvester do need maintainance (see "Field Setup") in order to work like they did when they were correctly built (clicked pin connections for the slides, and spread walls for the harvester).  This post is to remind you about Rule 14's "Quality Control" procedure.  You share the responsibility for being sure the models are in tip-top shape if those models are critical to your game.  It so happens that when the robot interacts with these particular models, it's only half way toward earning full credit for the associated missions, so benefit-of-the-doubt is much harder for the ref to give.  The ref can still give you that favorable call, but It has to be REALLY obvious that a failure was the model's fault.  So do your part to reduce your chance of depending on a benefit-of-the-doubt call.

Best Regards,

Bill

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