Comparing Characters Of A Word To Puzzle Board - Diagonal Search Algorithm

Coding (must follow pseudocode algorithm provided) for comparing characters of a word to a puzzle board char[][].

I've gotten the horizontal and vertical searches to work, but I'm having a difficult time figuring out how to search diagonally.

Here's the search algorithm format I have to use:

for each guess word
for each letter of the puzzle
for each letter of the guess word
check for diagonal match
if found, add word to list, break to next guess

I'm assuming there should be a +1 horizontal offset after I find the first letter, but every index I've bumped has caused me to screw up my array bounds. I'm missing something.

Here's the algorithm I'm using for diagonal search. This same algorithm worked for vertical search (minus the offset of course)

//diagonal search
for(String word : guessWords) {//for each guess word
 int letterCount = 0;
int index = 0;
for(int j=0; j<grid[index].length; j++) {//for each puzzle letter
 
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