question: Chopin had to decline who 's invitation in 1843 to particpate in a performance at Erard 's ?
answer: Alkan
turker_answer: In 1843 , Chopin had to decline the invitation from Alkan to participate in a performance at Erard 's .
rule-based: Chopin had to decline Alkan 's invitation in 1843 to particpate in a performance at Erard 's .