First grade children and their teachers participate in our research. Teachers participating in the experimental methodological work took part in the testing and implement and comment on the methodological materials. Teachers of the control groups participate only in the testing, they administer the tests, but proceed according to the usual methodologies. The third group teaches using the Chess Palace methodology developed by Judit Polgár.

The number of children of different test groups are the following:

1. 1. The experimental group participating in methodological development N= 443
2. 2. Control group not participating in methodological development N= 300
3. 3. The group studying with the Chess Palace method N= 307

Most of the children solved all the tasks of the test battery, and we got a complete set of indicators for a school-entry sensorimotor and cognitive profile. According to the age distribution, 94.57% of the children participating in the study are 6-7 years old.

Thanks to the competent cooperation of the teachers, we have a rare large database available for further research, in which we examine the development of children starting school. We can create a school-starting profile, which indicates the necessary sensorimotor and cognitive skills needed to acquire school skills.

Table 1 Number of children participating in the testing and number of completed tasks.

Group	Nr. of children	Completed tests	Completed tasks/children
Training	443	12602	28,45
Control	300	8317	27,72
Chess	307	8776	28,59
Sum	1050	29695	28,28

Table 2 Age of the children participating in the testing

Age	5	6	7	8	9	10	Sum
Children	1	387	606	43	12	1	1050
%	0,10%	36,86%	57,71%	4,10%	1,14%	0,10%	100,00%

Teachers receive statistical and visual feedback about each of the children and classes. We exchange information during joint and individual consultations. By this process we try to ground the data-based teaching. According to our assumption, teachers will be more aware of the data, and that way of their students’ abilities in the next year and when they choose teaching methods from our offer, they consider the development of the class.