user: Question: Which horse was Horse 1 when René Guzmán raced with the Mulchén association?
Columns: ['Year', 'City', 'Rider 1', 'Rider 2', 'Horse 1', 'Horse 2', 'Association']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1949.0, 'Rancagua', 'Ernesto Santos', 'José Gutiérrez', 'Vanidosa', 'Bototo', 'Temuco']
SQL:

assistant: SELECT "Horse 1" FROM "Table" WHERE "Rider 1" = 'René Guzmán' AND "Association" = 'Mulchén';