Someone once joked that Hans Berliner was only comfortable in a position where he was a rook ahead and on the move in an otherwise symmetrical position. So the endgame composers began to compose “Berliner Positions” in which White is rook ahead and on the move in an otherwise symmetrical position and … lost.
Today’s game reached symmetry after 12 moves, which symmetry I broke with 13. Bb5. Was White better for that? My first impulse was 13. Bd3, which Stockfish favors and calls equal.
In retrospect, 16. a3 looks like a mistake, compared to 16. Bc3. Later, I probably should not have been so eager to trade off all four rooks, after which I managed to draw the very difficult N vs. B ending. The spectators agreed that the opening and midgame were okay, but that the ending was the most fun to watch!