play into someone's hands

Verb

 * 1) To act, or to manage matters, to someone's advantage or benefit.

Translations

 * Finnish: pelata jonkun pussiin
 * French:
 * German: jemandem in die Hände spielen
 * Polish: działać na czyjąś korzyść
 * Russian: игра́ть на́ руку кому-либо