<New York Times, 16 September 1929, page 24 of the sports section:
‘WIESBADEN, Sept. 15 – After having suffered defeat in the fourth game of my match with E.D. Bogoljubow, it was, of course, highly important that the fifth game should not terminate similarly, for while the loss of a single game can be ascribed by the victim more or less to circumstances, two successive defeats are likely to have a detrimental psychological effect in that a player may lose his self-confidence, a circumstance which might have a decisive bearing on the final outcome of the world’s match.
Despite these considerations, I decided to adopt, in the fifth game’s opening, the same active variation of the accepted Queen’s Gambit that I had played in the third game in preference to choosing some placid opening which insured a draw.
In this I was not influenced by the fact that the third game was won for me on the 53rd move through the king taking the knight’s pawn instead of bishop to rook five, but I wanted to effect a reinforcement in position which would allow the black to obtain a simplification of position under highly unfavorable circumstances.
This departure bishop to knight five on the seventh move netted me an advantage in so far as my opponent, in the belief that he had safely negotiated the hidden reefs in the opening stages and arrived at an exchange of queens on the 16th move, found himself confronted by a difficult endgame problem in that he not only had to find a way of releasing his queen’s bishop, whose isolation was the immediate purpose of my opening variation, but he was also compelled to find usable squares for his knight.
As matters went, Bogoljubow succeeded in solving the problem fairly well, and despite a slight inferiority in his position he might have obtained a draw had he played pawn to queen’s knight three on his 23rd move, which meant the exchange of his only well placed piece. The move he elected to make permitted me to form an accurately calculated combination which terminated in the decisive sacrifice of a piece, the gain of a pawn and an irresistible pressure of all white pieces.
The rest of the game suggests a useful demonstration of how such positional advantages are exploited, Black resigning on his 48th move. Taken altogether, this game is considered by me the most important so far played in the match.’>