template <int H, int V>
class SpecificBoard extends Board {
    Point<H,V>** array;
    new() { array = new Point<H,V>[H][V]; 
            /* then set i,j on each... */ }
    ...
}

template <int H, int V>
class Point {
    int i,j;
    new(x,y) { i = x; j = y }
    ...
}

Board* board = new SpecificBoard<10,10>;