Additional truncation to allow deeper searches

since with the nature of shogi, the pieces don't move very far very quickly, assessing "clusters" of many pieces for each player instead of the whole board may allow for deeper searches while maintaining best outcomes. Potentially.

Idea is essentially look at a segment of the board(say 5 by 5) where a lot of a player's pieces are located, as this is likely where the attack is going to be. Specially attention needs to be done to also look at moves including the rook, bishop, lances, and knights.
- Potentially get the pieces that can move into this 5 by 5 area -- however this somewhat defeats the point.