Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_49638 ( "Rank" real, "1-year peak" text, "5-year peak" text, "10-year peak" text, "15-year peak" text, "20-year peak" text )

### Question ###
What is the 20-year peak with emanuel lasker, 2816 as the 15-year peak?

### Accurate SQL ###

SELECT "20-year peak" FROM table_49638 WHERE "15-year peak" = 'emanuel lasker, 2816'