Dr. Siggy: F. Reinfeld, "Tarrasch's Best Games of Chess", London 1947, pages 290-2:
Introduction: - "Here is one of Tarrasch's finest games, and one of the most instructive examples in chess literature of the power of the two Bishops [...]."
About 12... g5! - "A significant move. The proper way to make use of the two Bishops is to follow a policy of restriction which will leave the enemy's Knights with less and less scope. The text has the future virtue of compelling White to commit himself on the further disposition of the QB. After 13. Bg3, the Bishop would lose contact with the Queen's side."
About 14... c5! - "Another characteristic move. Now White's Knights no longer have access to d4."
About 17... Nd4! - Forcing White's reply, which gives Black two Bishops against two Knights."
About 23... Bf8! - "[...] ...Rfe8 would sooner or later lead to exchanges, which would somewhat relieve White's cramped position."
About 24... Rg8: - "Preparing to drive White's Knight away from e4. The constriction increases space."
After 30... Ra8: - "Black's next objective is to enforce ...a7-a5-a4. The position of the Knights becomes more and more painful with every move."
After 34... Be6! - "Tarrasch needs to accomplish only two more moves to reduce White to impotence: the Pawn advances ...a5-a4 and ...c4."
About 38... c4! - "White is defenceless: if 39. dxc4 bxc4 and his b-pawn soon falls."
After 46... Bb4: - "White resigns. «Many people will find this game very boring, since 'nothing seems to happen' for the first 37 moves. Yet I look upon the game as one of my finest achievements; the connoisseur will endorse my judgement.» (Tarrasch)."