Copyright 1991,1996, 1997, 1998 John Richard Coffey.
Please use the links below to center the problems, and to advance to the next diagram.
These diagrams are best viewed in 640x480 graphics mode.
If Internet Explorer has trouble displaying these diagrams then use the font-size button to select a smaller font and then also click the refresh button. Then if pieces should start to disappear then press the stop button and click on any pieces that are missing.
/