Both approaches have proved fiendishly difficult and, in the case of stem cells, controversial.

To differentiate 11 separate voices within a single story is a fiendishly difficult thing.

The fiendishly difficult task has seldom looked more likely than for Pep Guardiola's men.

It boils down to how human beings find it fiendishly difficult to be random.

Policies to deal with this are often easy to design but fiendishly difficult to implement.

It is often a fiendishly difficult balance to strike.

This castle proved fiendishly difficult to figure out, and Nell spent a few weeks working on it.

It has just been fiendishly difficult for mutual ownership to work in professional football's mucky reality and murderous economics.

Yet their lapses carried a sting and they now face a fiendishly difficult task to reach the last 16.

The penny has dropped: it is going to be a fiendishly difficult exercise with a highly uncertain, but probably disastrous, outcome.

With Cellino completely in charge, this ban looks fiendishly difficult to enforce -this is the next challenge for the League.

If it's the penultimate weekend in January and the permutations are fiendishly difficult and endless, it must be Heineken Cup round six.

Sudi Pigott is a UK food writer and culinary trends consultant who has a sideline in setting fiendishly difficult questions for food quizzes.

England have been drawn in a fiendishly difficult pool alongside Australia and Wales and will have done well merely by progressing from the group.

Named after a French virtuoso who never performed it, Beethoven's Sonata No 9, Op 47 "Kreutzer" is indeed emotionally wild and fiendishly difficult.

Fiendishly difficult decisions and a busy three months lie ahead.