Hello, Dale. Thought I recognized the style. I like the concept of Taiga. This game may well work better than the first one I posted at CV, but let me steppe right along to my suggestion. You will find a problem in checkmating the king without some sort of way to confine the elusive piece. I would add the following rule to the game:
A king may hold the other player's king in one big square. When a player moves the king into the same big* square as the opposing player's king, the opposing player's king is "held". The opposing player's king keeps its moves on the little squares, but may not move out of the big square both kings are in. Only the opposing player's king is held. The player who created the hold may freely move the king out of the big square the enemy king is held in, even to get out of check, or to give a discovered check. This breaks the hold. Otherwise, both kings stay in the same big square until one of them is checkmated. The held king only needs to be checkmated in the big square it's in, it can't leave. The holding king, to be mated, must have all its allowed big square destinations guarded also.
*A "big" square is one of your 10x10 "building blocks" for the gameboard. Its boundaries are clearly shown by the color change. A little square is the individual square a piece sits on.