Re: 5x5 difficult of 1Apr2019

nashvillebudd wrote:

This puzzle seems unsolvable to me.

I start by filling in the givens...d1, c5, e5.

Now looking at column d, d2 cannot be zero since that would force c2 to also be zero, d4 cannot be zero since either b4/c4 must be a zero, and d5 cannot be zero since either a5/b5 must be zero.

That leaves only d3 to be a zero.

But in order for that clusters subtraction to equal zero that would force e3 and e4 to be the same number.

Stalemate.

What am I missing? Can anyone help?

You are reasoning wrongly because when you have negative numbers in a puzzle like this not necessarily e3 and e4 must be the same number, What about a -1 and a 1, for instance?: 0 - (-1) - 1 = 0