Table: chesnokov_tournaments
Columns: tournament
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000

Question: What is the 1986 value with A in 1991 and A in 1987?
SQL: SELECT "1986" FROM chesnokov_tournaments WHERE "1991" = 'a' AND "1987" = 'a'

Question: What is the 1995 value with A in 1986 and 2r in 1992?
SQL: SELECT "1995" FROM chesnokov_tournaments WHERE "1986" = 'a' AND "1992" = '2r'

Question: What is the 1989 value with F in 1990?
SQL: SELECT "1989" FROM chesnokov_tournaments WHERE "1990" = 'f'

Question: What is the 1987 value of the 1994 atp masters series?
SQL: SELECT "1987" FROM chesnokov_tournaments WHERE "1994" = 'atp masters series'