In both 1991 and 1992 , they lost closely contested League Championship Series to the Atlanta Braves .
The Pirates would win the first three NL East titles of the 1990s , but failed to advance to the World Series each time .
In both 1991 and 1992 , Pirates lost closely contested League Championship Series to the Atlanta Braves .
The Pirates would win the first three NL East titles of the 1990s , but failed to advance to the World Series each time .