Ari Enkin, Translation:Shulchan Aruch/Yoreh Deah…
“ Only if cut with a knife will you have to go back and re-wash, because through the pressure of a knife, blood is brought up to the surface. However, according to the Ran who holds the reason for the washing is to soften the meat, it would make no difference how many cuts are made, and re-washing would not be required. However, halacha follows the opinion that the rinsing is due to blood, therefore re-washing will be required even post facto. ”
