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According to TVA's Renaud Lavoie the Buffalo Sabres have traded goaltender Ryan Miller to the St. Louis Blues in exchange for Jaroslav Halak:

Jaroslav Halak traded to Sabres for Ryan Miller #blues — Renaud Lavoie (@LavoieRenaud) February 28, 2014

It's not immediately clear whether or not there will be more pieces involved in the transaction, which as of yet is not confirmed.

Both Halak and Miller are pending unrestricted free-agents and both have a nearly identical career save percentage.