Quickly excavating the Grail.

The trick is to make it seem as if the hero didn't move. That is, if there were 2000 movement points, you need to make 5 (not 4 and not 6) straight (not diagonal) steps, after which 1500 movement points will remain. If the hero had spent the night with the Gnomes, then at the beginning of the day, he would have 1500 movement points... The program thinks that the hero didn't move and gives him the opportunity to dig.

You can make 3 steps and give the Centaur a turn, then 1700 movement points will remain.