search algo using digits of pi

[rsunil]

this is an experimental idea I was thinking of implementing in my chess engine. I've revised the concept a couple times over a few months but not as well as I want to articulate it.

Sphere Search Idea
- Use digits of pi as a deterministic pseudo-random stream to guide exploration.
- Treat move exploration as an expanding sphere of possibilities. // i don't know how to really explain this
- Use sphere radius to control breadth/depth of sampled lines.
- Aim to index more scenarios (MCTS-like coverage) while keeping deterministic reproducibility.

thoughts and comments would be appreciated!