The discussion of openings employed at this tournament would not be complete without first mentioning the Cambridge Springs Defense, a variation of the Queen's Gambit Declined. Click here for more information.

The most common openings were the Ruy Lopez, Queen's Gambit Declined, Sicilian Defense and Petroff's Defense. It is interesting to note that by 1904 the King's Gambit era had faded (however see Rice Gambit) and the Indian defenses had not come on the scene. Also, many of the Sicilian games did not follow the mainlines that have developed over the 90+ years since the tournament.

The Encyclopedia of Chess Openings (ECO) codes are included in brackets in the header information of the game scores in the page for each round (click on Games). Below I have started an index of the games based on ECO code. A direct link to each game score is provided. This index is now 100% complete.