We congratulate Yao Sun1 and Ting Li1 for solving the 3-round pre-image challenge on Keccak[r=240, c=160].

The previous pre-image challenge on the 400-bit version was solved on 2 rounds by Paweł Morawiecki in 2011. This present challenge was solved by combining brute-force and algebraic techniques. It took 5 days with eight GPU cards (nvidia 1080Ti).