[zdkl]

If you can work a forteress without both coal derivatives AND metallic ores deposits, you're a better dorf than I am.

[Brybry]

There are smelting bugs in the game where melting down certain items produces more metal than it takes to make them.

That and hatch covers (building destroyers can't destroy on different z-axis) makes it really hard to lose in Fun ways. Most of my fortresses die from FPS death.

[hobs]

Do you have water? A pump room with specific gates is a great way to murder traders and steal all of their things without them declaring war on you.

However, this entirely breaks the game and if you dont have your entrances and exists covered, you will be sieged VERY soon.