  Utilizing lattice QCD results for the potential of two static antiquarks and
two dynamical quarks as well as quark model techniques for the dynamics of two
heavy antiquarks in a cloud of two light quarks, we are provided with an
accurate framework for the study of possibly existing heavy-heavy-light-light
tetraquarks. Among the possible quantum numbers of such a system, we find
binding in only one channel, the scalar isosinglet. Solving the Schroedinger
equation for the displacement of the heavy antiquarks and taking systematic
errors into account, we find an antibottom-antibottom-light-light bound state
with a confidence level of around 1.8 sigma ... 3.0 sigma and binding energy of
approximately 30 MeV ... 57 MeV.
