A tee shot that settles there, on the safe side of the traps, demands a tricky downhill putt on grass as slick as a granite countertop.
But the calculation of how much to do is tricky, demanding deep scientific understanding of an area's ecology.
In this respect, the use of Nonlinear Response History Analyses (NRHAs) appears to be computationally expensive, time demanding and potentially tricky for most practicing engineers.
Giving a console is like giving a pet: it's a long term commitment and it can be tricky and demanding.
Our final day's walk was a demanding 13km-worth over tricky-though-not-ruinous terrain and took most of the day.
That is partly because the theory is difficult: it demands lots of tricky mathematics.
Sure, the modern voter - independent of mind, unwilling to accept conventional wisdom, demanding clear results - is trickier to inspire, harder to coax than before.
For one thing, they are mostly based in the US, so making demands is tricky, even with the new transatlantic love-in.
Thanks to the Internet, the disproportion between writerly supply and demand, always tricky, has tipped: anyone can write, and everyone does, and beginners are expected to be the last pure philanthropists, giving it all away for the naches.
It takes four weeks to make and pack barbecue coals, which tend to be imported from elsewhere in Europe and as far away as South Africa, so responding to sudden surges in demand is tricky.
