Clarify the answer of given question
Question- Williams purchased a used car from Stein for $1,000. Williams paid for the car with a check, written in pencil, payable to Stein for $1,000. Stein, through careful erasures and alterations, changed the amount on the check to read $10,000 and negotiated the check to Boz. Boz took the check for value, in good faith, and without notice of the alteration and thus met the Uniform Commercial Code's requirements for holder in due course status.
Part 1- Can Williams successfully raise the universal (real) defense of material alteration to avoid payment on the check? Explain.
I need help to explain the universal defense of material alteration.