Validation: at least one associated object

Suppose I have the following model:

Game hasMany Moves
Move belongsTo Game

Is it possible to specify in the Game model that a game should only be
created when at least one move is associated with the data?

For example, a call to Game::save( array('Game'=>array
('title'=>'foo)) ) should fail but a call to Game::save( array
('Game'=>array('title'=>'foo), 'Move'=>array('data'=>'bar')) ) should
succeed because there is a move attached.

Also, obviously if the Move object can't be saved for some reason then
the entire thing fails also.
Thanks for any input.
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