initializing an array of user-defined data types

I have a rank 2 array of a user-defined type as follows:

type(piece), dimension(:,:), allocatable, private :: board

After allocating it, I want to initialize it so that after
initialization, I can check whether board(i,j) contains a piece
or not.

I've tried things like

board = NULL

.... assign some pieces to board positions and leave others empty ...

if (board(i,j) == NULL) then
... do something ...
end if


but that doesn't seem to work.

What is the proper way to do this?

Thanks,
Bart

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