All groups practiced forks from Beginning Chess by Bruce Pandolfini.
Beginner Group: I announced just one fork problem at a time, putting the problem on the demonstration board and writing it on the notepad. Students did not set up the problem on their boards. They were asked to write their answers and then we discussed them.
Adaptation for Experienced Group: After two example problems, I did not put the problem on the demonstration board. Students set up each problem on their own boards. Then they wrote their answers before discussing with their partners.
Adaptation for Advanced Group: Same as for Experienced Group but they solved more fork problems.