	@Test
	public void testAt() {

		String[] before = {
				"......#",
				".....#.",
				"..#...#",
				".#.#...",
				"..#....",
				".......",
				".......",
		};
		board.setUpProblem(before, BLACK);
		assertFalse(conjunction.at(at("g6")));
		assertFalse(conjunction.at(at("c4")));
		assertFalse(conjunction.at(at("a2")));
		assertTrue(conjunction.at(at("d3")));
	}