private static void printPartialFieldMap(Field[][] pMap) 
	{
		System.err.println("pMap");
		for (int y=0; y<pMap[0].length; y++) {
			for (int x=0; x<pMap.length; x++) {
				if (pMap[x][y] != null) {
					Object o = pMap[x][y].object;
					if (x==2 && y==2) System.err.print(" a");
					if (o instanceof Box) System.err.print(" b");
					if (o == null) System.err.print("  ");
				} else { 
					System.err.print(" +");
				}
			}
			System.err.println();
		}
	}