Risk of Ruan

Jiayu Ruan opened under the gun plus one to 650,000. It folded to button Santiago Plante who moved all in for 3,650,000.  Back to Ruan, who considered his own stack (around 7,500,000 behind) before tossing in calling chips. Ruan: [Adqh] Plante: [4d4c] The ace flopped: [Ac2s5d] and Plante said something to his neighbour.