One of the ways to effectively teach informatics in primary school is to provide an entertaining character of learning. Entertaining tasks include tasks for game strategies that allow younger schoolchildren to learn to search for a winning strategy when playing with chips, checkers, dominoes, mathematical lotto, etc. The purpose of the article is to describe the features of teaching younger schoolchildren to solve problems to determine a winning strategy in an analytical way. The article discusses the basic concepts of game theory necessary for solving problems of determining a winning strategy at the level of primary general education: the definition of mathematical games, their rules, the concepts of winning strategy and correct game. The methods of solving games with a symmetric winning strategy and with a winning strategy of addition to a number, a description of winning strategies and an example of an algorithm for one of the considered problems are given. It is concluded that the ability to determine a winning strategy can be attributed to meta-subject skills.