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April 18th,1991: Leon. Nicaragua- El Salvador 2-3
April 24th,1991:San Salvador. El Salvador-Nicaragua 2-0
Other Sources say Managua instead of Leon (Santiago de los Caballeros de Leon) and different date (April 4th instead of 18th).
Just for information: the Final Round was in San José de Costa Rica (La Sabana) from May 25th to June 2nd.