Chiefs send:
CB Ty Bryan 23yo 75 overall
2017 Chiefs 6th round pick

for

Dolphins send:
2017 Dolphins 3rd round pick
2017 Dolphins 4th round pick

Reasoning:
Chiefs: Ty Bryan is stuck behind 4 corners on my roster, all are pretty young except for 29yo Sean Smith, I would like to stockpile some picks this year to possibly get younger and better. I drafted Bryan in the 2nd round and was pretty disappointed in his slow development trait.
Dolphins: They desperately need capable corners and with Bryans 81 mcv 78 zcv 82 press 81 strength, Bryan is capable of being good with some confidence instilled.

Chiefs send:
QB Alex Smith 32 yo 83 ovr

for

Redskins send :
2016 4th round pick 101
and
2016 7th round pick 197

Reasoning:
Chiefs: Alex Smith is getting old and let me down in the playoffs this year. He does not have much throw power, which doesnt fit my scheme. I desperately wanted to get rid of him. I will look to get better at the position in the draft, likely spending a high pick on the position.
Redskins:  RG3 isnt that accurate. So they get better medium and short accuracy back for fairly cheap.