Fourteenth book of series the "School mathematical mugs" sanctified to the logical tasks and is continuation of before going out book of И. В. Раскиной and Д. Э. Шноля the "Logical tasks" (producing 11).A book was entered by developments of ten employments of mathematical group with the examples of tasks of different level of complication, tasks for an independent decision and methodical pointing for a teacher. A large list over is brought also additional tasks. To all tasks answers over and detailed decisions or pointing are brought to the decisions.The feature of book is a presence of playing scenarios to the separate tasks and whole employment, realization of that will help the best mastering of material.For comfort of the use final part of book is done as distributing materials. A book is addressed to the teachers of mathematics and leaders mathematical groups. We hope that she will be interesting to the schoolchildren and their parents, students of pedagogical institutions of higher learning, and also all logic lovers.