You can cheese them in a 3 x 3 bedrock formation. You just have to have a bedrock above their head one block above the 3 x 3. 4j changed the wither a couple updates ago and they can now break 4 x 4 x 5 blocks around them, including any block that is above their head (unless its bedrock). Finding that particular formation of bedrock isn't impossible, but it takes time. The nether ceiling and walls are the only places where you will find such a formation.
Hello Again,
So is there any way of killing the wither easy? I see the 3x3 bedrock trick doesn't work on console :-(
You can cheese them in a 3 x 3 bedrock formation. You just have to have a bedrock above their head one block above the 3 x 3. 4j changed the wither a couple updates ago and they can now break 4 x 4 x 5 blocks around them, including any block that is above their head (unless its bedrock). Finding that particular formation of bedrock isn't impossible, but it takes time. The nether ceiling and walls are the only places where you will find such a formation.