T-SQL (SS2K8) :: Select Query With Multiple Where Conditions And OR Operator

I have the got below T SQL query to fetch the matching record

DECLARE @MappingTable TABLE
(
Productname nvarchar(10),
identification_key1 int,
identification_key2 int,
identification_key3 int

[Code] .....

-- result - 'Orange'

This is an exact matching record and straight forward

Is it possible to identify the record using T SQL query based on the following scenarios

1) return the record - If all the three where conditions match
2) if record not found check and return the record where 2 columns values in the where condition match

-- Expected Result for below query: 'Orange', because 2 of the columns in where condition have matching values

SELECT Productname
FROM @MappingTable where identification_key1=1 or identification_key2 =2 or identification_key3 =1

-- result - 'Orange'