Table:
0
A
B
C
D
E
F
1
Rank
1-year peak
5-year peak
10-year peak
15-year peak
20-year peak
2
1
Bobby Fischer , 2881
Garry Kasparov, 2875
Garry Kasparov, 2863
Garry Kasparov, 2862
Garry Kasparov, 2856
3
2
Garry Kasparov , 2879
Emanuel Lasker, 2854
Emanuel Lasker, 2847
Anatoly Karpov, 2820
Anatoly Karpov, 2818
4
3
Mikhail Botvinnik , 2871
José Capablanca, 2843
Anatoly Karpov, 2821
Emanuel Lasker, 2816
Emanuel Lasker, 2809
5
4
José Capablanca , 2866
Mikhail Botvinnik, 2843
José Capablanca, 2813
José Capablanca, 2798
Alexander Alekhine, 2781
6
5
Emanuel Lasker , 2863
Bobby Fischer, 2841
Bobby Fischer, 2810
Alexander Alekhine, 2794
Viktor Korchnoi , 2766

Questions and formulas:
Question: What is every 5-year peek with a when Anatoly Karpov, 2820 is 15-year peak?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="Anatoly Karpov, 2820"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,E2:E6="Anatoly Karpov, 2820"),3))
Level: medium
Question: What is the highest rank when Garry Kasparov, 2879 is the 1-year peak?
Formula: MAXIFS(A1,B1,"Garry Kasparov, 2879")
Formula2: MAXIFS(A2:A6,B2:B6,"Garry Kasparov, 2879")
Level: easy
Question: What is every 5-year peak when Emanuel Lasker, 2847 is the 10-year peak?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1="Emanuel Lasker, 2847"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,D2:D6="Emanuel Lasker, 2847"),3))
Level: medium
Question: What is the highest rank when Anatoly Karpov, 2820 is the 15-year peak?
Formula: MAXIFS(A1,E1,"Anatoly Karpov, 2820")
Formula2: MAXIFS(A2:A6,E2:E6,"Anatoly Karpov, 2820")
Level: easy