Bxa6 prevented White from castling and by doing so kept the KR out of the game.
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In this position, I (black) played Bxa6. Obviously, Rb8 is better, but that's not the point here.
When I first reviewed this game, Bxa6 was considered a mistake. I decided to look again out of sheer boredom and now it says Bxa6 is brilliant (although Rb8 is still considered better).
It really is amusing what can happen if you give it time.