Kaliningrad is a Russisan enclave, surrounded by Poland and Lituania, but let's go back into the past until 1735. Königsberg is een prussian town along the river Pregel. It's a Sunday habbit to go for a walk along the town.

In the midst of the town there are two little Islands int the River Spregel. The different parts of the town are connected by seven bridges. As a game a question is raised: "Is it possible to make a walk along the town while crossing each bridge just once?"