All of these answers are grotesquely incorrect.
The answer is, as follows;
A Dutch 200 is obtained when you're "locked in" on one lane, striking at will, yet refuse to make the necessary adjustments on the opposite lane to throw strikes and are left with remedial spares, which you somehow convert.
Strike/spare...spare/strike...what a silly response...
--------------------
Not all great shots result in strikes and not all strikes are great shots.