  Ultimate Tic-Tac-Toe is a variant of the well known tic-tac-toe (noughts and
crosses) board game. Two players compete to win three aligned "fields", each of
them being a tic-tac-toe game. Each move determines which field the next player
must play in.
  We show that there exist a winning strategy for the first player, and
therefore that there exist an optimal winning strategy taking at most 43 moves;
that the second player can hold on at least 29 rounds; and identify any optimal
strategy's first two moves.
