As there are 3 boys and 2 girls in the group, only 1 game was played between a girl and a girl.
Since a group of friends played chess, and each person played exactly one game with each other in the group, and out of the total number of games played, 3 games were played between a boy and a boy, and 6 games were between a boy and a girl, to determine how many games were played between a girl and a girl, the following calculation must be performed:
Therefore, as there are 3 boys and 2 girls in the group, only 1 game was played between a girl and a girl.
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