Normally he probably would not have bothered her, but at the moment, he felt like some company. So when she didn't turn him away, he gave a nod and sat down opposite her. His mind was only partially present. He was rather worried about Clara. Not to mention he was worried about his sister as well, but he was always worried about his sister. He would need to go visit his sister again in the near future, to see how she was progressing.
Anatoly did, however, catch the look Svetlana gave to a dark-haired girl sitting not that far off with a book. That was a bit unexpected. Given the lack of any other adult being near the girl and Svetlana having looked at her, Anatoly gathered she was watching the girl for someone. So he didn't question just yet, instead he turned his attention to the chess board and saw Svetlana's opening move.
Without really thinking about it, Anatoly made his opening move. Which simply happened to be rather like his opening move in a chess game they had played together in his dreams. Now, he wasn't going to bring up the subject of dreams because, well, the last time he'd said anything he'd been less than eloquent about it. Plus he didn't want to make Svetlana feel uncomfortable, so he'd keep his mouth shut on that matter, anyway.
Unless Svetlana brought it up, then he'd say something about them. But for the time being, he fell into silence as he waited for Svetlana's next move. It wasn't uncomfortable silence. He felt comfortable enough around Svetlana to not have to fill the air with words that would undoubtedly come out wrong anyway. Anatoly was talented like that, after all.