Analyzing the example, find the easy rules of filling the grid with numbers. Hint: there must be either a white or a black dot between 1 and 2.
Answer key: write down the content of the diagonal, going from bottom-left to top-right. For example the answer would be: 2,2,2,4,1.
Place all of the seven given figures (you can rotate them) in the 20x20 grid without overlapping, so that the resulting holes are all identical. Holes may differ in rotation. One figure is already placed.
This puzzle has more than one solution. One correct solution brings 4 points; and every next brings half the score of the previous one, as in: 4 - 2 - 1 - 0,5 - 0,25 - ... Answer key: for each solution, first write down the number of holes, then list all the figures from top to bottom, by their top points. For example the answer would be: 3: AB,C,E,D,F. Separate different answers with a “-”.