I coil silently around my subject. My language is simple, but my logic is strict. I build great things, but never a nest.

If you've got it, you haven't shared it. If you've shared it, you haven't got it. What is it?

I’m something you cannot ever win, A battle of thought that lies within. No board, no dice, no coin is tossed... As soon as you think of it, you have already lost.

Weightless yet visible, I lighten a bucket when added. Not light, gas, liquid, or stone, I exist in absence. What am I?

I am an odd one, but if you take a letter from me, I'll be even.