There is a much easier, player-friendly way of doing it - but it requires a ton more triggers and locations.
Name the locations based on the row and column that its in, like so:
A1 B1 C1 D1 E1 F1 G1 H1
A2 B2 C2 D2 E2 F2 G2 H2
A3 B3 C3 D3 E3 F3 G3 H3
A4 B4 C4 D4 E4 F4 G4 H4
...and so on. That makes each column a letter and each row a number. Then make another 1x1 location in the center of each square, and name them accordingly (like A1 Center, B1 Center, etc.). Then you need one location that will follow the moving pieces (let's call it FOLLOW PIECE) and one location that will be the return spot (explained later). You also only need one area to end your turn (like sieging a tank ends the turn or something).
Essentially the idea is that you'd need three computer players and a flag representing a marker that shows where a unit can move to. As an example, lets say you have a Bishop at B2. When you move the Bishop out of that 1x1 center location, all your other pieces switch to a computer player, and a new Bishop is made at the center location for a different computer player. Center the "return spot" location on this computer owned Bishop.
In a separate trigger, the conditions will check to see that its your turn and if the computer's bishop is in B2 while the actions create flags at A1, C1, A3, C3, D4, and so on. If a unit is in C3 and another one is in C4, the flag in C4 will explode.
You move the Bishop to any square you want (with the FOLLOW PIECE location following the unit), at this point. Siege the tank to end your turn. When the tank is sieged and there is no flag in that FOLLOW PIECE location, the Bishop moves back to B2 (or rather moves to the "return spot" location). If there is a flag in the FOLLOW PIECE location, the Bishop kills whatever unit in in that square (if there is a unit), the Bishop is given to a computer, and the turn is over.
Whew that took forever to type. If you need an example, I guess I can make one using the Bishop thing. If you already have a better way of doing it, though, I'd rather not waste my time on it.
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Thanks a lot, that was helpful though I will do what you said at the very bottom and stick to mine. Though if I have any problems I have one t go back to.