HBond Network: Create a hydrogen bond network with at least six bonds. Four hydrogen bonds must span the ligand-protein interface.
Segment 1 can't be selected by any means in this puzzle, such as "selection.Select ( 1 )". This is probably bad news for recipes which work on selected segments, since segment 1 seems to start with a negative score.
Segment 211 is a real ligand in this puzzle, but it's possible to turn segment 210 into a fake ligand using the auto structures tool. It's just a little more difficult in this puzzle, since segment 211 must be deselected for the auto structures tool to appear.
See http://fold.it/portal/node/2000613#comment-30568 for a update on the bogus ligand issue.
After posting the previous comment, I found that segment 1 is locked. This probably explains why it can't be selected. Another interesting point for recipe writers to contemplate.