NHL free agency began on Tuesday, and the Chicago Blackhawks kicked off the week with a trade. What we know:The Blackhawks announced Tuesday morning that the team has re-acquired forward Sam Lafferty in a trade with the Buffalo Sabres. Chicago adds a defensive-minded forward and deepens the bottom-six rotation in exchange for a sixth-round pick in the 2026 NHL Draft. Coincidentally, Lafferty left Chicago as part of the trade package the Blackhawks sent to Toronto that landed them the No. Adding an impactful free agent could be a challenge depending on how the market shakes out in the early days of free agency.