ABSTRACT
On which block is house #5 of Horizontal Street, if there are four houses in block B?
What digit should replace the question mark? Solution on page 92.
Eight equal coins, four “heads-up” and four “tails-up,” form a starlike shape shown in the diagram on the left. Observing the “doubletouch” rule, reach the position shown on the right within the minimal number of single-coin moves. Th e fi nal orientation of the shape may diff er from that shown.
