The ornamental design for a Sep. 11, 2001 commemorative chess set, as shown and described.
FIG. 1 is a front elevation view of a first embodiment of the pieces of the chess set, showing a fireman (pawn), a policeman on horseback (knight), a miniature at least generally depicting the St. Patrick's Cathedral in New York City (bishop), a miniature at least generally depicting the original Twin Towers (rook), a miniature at least generally depicting the Statue of Liberty (queen), and a miniature at least generally depicting the Empire State building (king);
FIG. 2 is a front elevation view of a second embodiment of the pieces of the chess set, showing a fireman (pawn), a policeman on horseback (knight), a miniature at least generally depicting the Empire State building (bishop), two separate miniatures at least generally depicting the Twin Towers (each being a rook), a miniature at least generally depicting the Statue of Liberty (queen), and a tattered flag wrapped around a flag-pole (king);
FIG. 3 is an enlarged front elevation view of the fireman holding an ax (pawn) shown for ease of illustration;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a side elevational view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is an enlarged left side view of the police officer on horseback shown for ease of illustration;
FIG. 8 is a right view thereof;
FIG. 9 is a front view thereof;
FIG. 10 is a top view thereof;
FIG. 11 is an enlarged elevation view of the tattered flag wrapped around a flagpole shown for ease of illustration;