Riddle: Is active defense always best?

It is a famous game, played between Siegbert Tarrasch and Akiba Rubenstein in 1911. It ended in a draw, and is given
as a model example for an active defence in rook endings in the books of Levenfish/Smyslov and Averbakh. However, matters are not that easy. Can you find the mistakes in the game play strategy?

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