lucas chap 04 11/20/02 12:00 PM Page 127 4 1 2 3 Opening With a Bang 127 5 6 7 8 9 10 15 12 11 13 14 16 17 19 18 20 21 22 23 25 24 26 29 30 27 28 FIGURE 4-4. Sample jigsaw puzzle