chess grid
each record is a snapshot of the grid at any given time (after each move)
usually at the very start of the game, or after a move
selected GRID_NR is 15
moves so far: 0
The first small number is the SQUARE NR, the next one is the PIECE ID
There are 168 squares and 80 pieces in all
target_grid:15
ChessMoveCtr:0 - GRID_NR:15 - target_grid:15