"If one rat is only 10 percent larger than the other, he can pretty much win every physical contest, every rat wrestling match - but they still wrestle to find out, and the larger rat almost inevitably pins the smaller.
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Once dominance is established, the rats can play ... something they can do in a manner very different from genuine fighting ... Now, the larger rat could pin the smaller rat every time. However, that breaks the rules ... Ther purpose of the repeated game is not dominance, but continuing play. This is not to say that the initial dominance is without significance. It matters ... However - and this is a critical issue - if the larger rat does not let the smaller rat win the repeated wrestling matches some substantial proportion of the time (Panksepp estimated 30 to 40 percent of the tome), the smaller rat will stop exhibiting invitations to play. It is just not any fun for the little guy."
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