Step 1: identify the sitting duck
A duck can be immobile in three ways:
- space (box!)
- time (duplo attack)
- function (defense)
Step 2: identify the type of immobility of the sitting duck
Every type has its own possible scenarios. Take for instance the box.
- chasing the king into the box
- covering a hole in the box
- blocking a hole with in the box with an enemy piece
- getting access to the box
Step 4:identify the best way to play the scenario
I intend to investigate the steps 2 and 3. Step 4 must be determined in the actual position. The plf-system can probably help us at step 4 as well.