English (UK) 
Українська 
A girl named Varia from Odessa, who is in the second grade and is very interested in Mathematics has contacted us, asking for interesting math problems, which she could solve at home alone or with her parents. We try to fulfill this request of Varia and select a consistent cycle of interesting math problems so that she can further train her abilities of logical thinking. This course may be useful for other children who are interested in Mathematics. Therefore, we decided to place such problems on our website. Other boys and girls may be interested in solving them and sending us their solutions.
For convenience, we have created a form, via which you can submit your solutions. We will answer only those solutions that will be justified. The work must be scanned and sent using this form in a single pdf-file. You can use, for example, the service pdfjoiner.com. The file name must start with your last name. It is desirable to use black or dark blue paste for registration of work so that the text you will write could be legible.
To upload images, right-click and select “save image”.
Lesson 5. Problems on the chessboard