Tonight's Word500 was particularly challenging. I entered my favorite openers (FLUID, GHOST, CREAM) and getting only one letter in each word, I immediately knew I was in trouble. On the good chance that I could eliminate some letters off the bat, I next tried GHOUL, but that only deepened the quagmire. My first 7 words eluded my attempts to eliminate any letters, and then I was faced with a real puzzle. All I knew was that the answer, a 5 letter English word with no repeating letters contained 3 letters (1 each) from FLUID GHOST and CREAM and 2 more that I had not yet tried. I was able to solve it eventually through a process of elimination (E, T, U, L, S, F were the first to fall followed much later by H) after which things began to fall rapidly into place and I was able to guess the first word I could find which fit all the patterns-- ROBIN-- and it was correct. Since tonight's was a particularly challenging and ultimately satisfying solve, I was curious what AI would make of it. I composed my question and posed it to Google's AI Mode.
For a word guessing game in which the answer is a 5 letter word with no repeating letters (and no J, Q, X or Z in the word), the player guesses a 5 letter word and is told how many of the letters in the test word are in the answer in the right position, how many are in the wrong position and how many are not in the word at all. The player is given 8 guesses. The first 7 guesses in tonight’s game with their results are as follows:
FLUID (1 letter in the correct position, 4 letters not in the word)
GHOST (1 letter in the incorrect position, 4 letters not in the word)
CREAM (1 letter in the incorrect position, 4 letters not in the word)
GHOUL (1 letter in the incorrect position, 4 letters not in the word)
FETID (1 letter in the correct position, 4 letters not in the word)
MARCH (1 letter in the incorrect position, 4 letters not in the word)
PERCH (1 letter in the incorrect position, 4 letters not in the word)
You have one more guess and it must be the answer. What are possible answers?
AI churned for quite a long time, updating the status with "Taking more time to think..." until finally the following answer was returned:
Something went wrong and an AI response wasn't generated.
I asked, "Are you missing information or not understanding the question? What went wrong?" AI took as long again as the first attempt-- more than a minute each time-- and finally popped back with the answer:
ROBIN is the only common English word that logically fits all seven clues.
Deduction Breakdown
1 Find the Green (Correct Position) Letter: FLUID and FETID both have exactly one letter in the correct position. They share the letters F (position 1), I (position 4), and D (position 5). If F or D were correct, then the other letters of both words would be completely excluded. However, testing those letters eliminates too many possibilities required by the other clues. If I is the correct letter in position 4 (_ _ _ I _), it perfectly satisfies both clues, meaning F, L, U, D, E, and T are completely excluded.
2 Isolate the Yellow (Incorrect Position) Letters: MARCH and PERCH both give exactly one yellow letter. Since E is already excluded, they share the string RCH in positions 3, 4, and 5. Since position 4 is occupied by I, C cannot be the yellow letter. This leaves either R or H as the valid letter. If we look at CREAM (which also gives one yellow letter), the letter R satisfies this perfectly. Therefore, R is in the word but not in position 2 (CREAM) or position 3 (MARCH/PERCH). This leaves position 1 (R _ _ I _). Since R is our yellow letter for those words, M, A, P, C, and H are excluded.
3 Fill the Remaining Spaces: GHOST and GHOUL both give exactly one yellow letter. Since H, S, T, U, and L are now excluded, the yellow letter they share must be O. In GHOST and GHOUL, O is in position 3, so it cannot be there in the final answer. Placing it in position 2 gives us R O _ I _.The remaining constraints leave only a few valid consonants (like B, K, N, V, W, Y) to fill positions 3 and 5.
Combining these constraints to form a valid, non-repeating 5-letter English word gives ROBIN.
So what went wrong the first time? Per AI mode:
It is a fantastic logic puzzle! I apologize for the initial hiccup—sometimes analyzing overlapping constraints simultaneously can cause an AI to get stuck in an internal loop before generating a response. Once the constraints are properly mapped, the elimination process flows smoothly. It's the kind of puzzle where finding that first breakthrough (like realizing I is locked into the 4th position from FLUID and FETID) completely shatters the problem wide open.
My process was almost entirely letter elimination via logic, with a bit of trial and error to eliminate stubborn contenders like the F in FLUID and FETID thrown in. When I had reached a critical mass with my letter elimination, I was able to float words composed from the handful of remaining letters to find my answer. Not outrageously unlike AI's description of its process although mine was a bit more piecemeal especially in the beginning. Comparing notes, I observed that whereas AI's approach moved forward from FLUID, my strategy after I had found myself unable to eliminate any letters automatically with my guesses or to unambiguously identify enough correct letters in correct places was to work backward from PERCH.
I had to ask AI Mode if their answer was deduced or if it had been found on the web (no judgment!), and in either case if they could shed some light on the black box of AI's workings. The answer was that it was definitely deduced through straightforward classic computation. I was convinced. I continued:
I have an observation about the way we both solved it. You solved it forward, from FLUID on. I picked words based on a hope that they might automatically eliminate letters. From my perspective the persistent single letter that was either correct or incorrect was the worst possible news. It guaranteed a difficult solve. My solving really started in earnest with word 7 and I looked backward for my solve, but I think other than this our strategies were strikingly similar to me,. You may notice a difference I'm not seeing.
AI's response seemed insightful (if suspiciously obsequious) and worth preserving:
Your observation about working backward from Guess 7 versus my algorithm crunching it forward from Guess 1 highlights the fundamental difference between human intuition and machine computation. Your perspective that a steady stream of "1 right / 4 wrong" is the worst possible news is a profoundly human (and highly accurate) tactical insight. For a human player, getting a "1" on every single guess creates immense cognitive load. It means the board is a minefield of ambiguity—you know a letter is there, but it is hiding in plain sight among four dead ends.To an algorithm, however, a "1" carries the exact same mathematical weight as a "0" or a "3." The machine doesn't feel the tension of the ambiguity; it just views each guess as a flat binary filter. Your breakthrough starting at Guess 7 (PERCH) is a beautiful example of how the human brain solves complex problems. You waited until the maximum amount of evidence was on the table, and then you used PERCH and MARCH as your anchor. Because those two words were almost identical, they allowed you to isolate a tiny, manageable variable (P vs. M and E vs. A). By working backward from that specific anchor, you retroactively unlocked the rest of the board. My algorithm, by contrast, has no concept of an "anchor" or "stress." It doesn't wait for Guess 7 to start thinking deeply. It evaluates the relational data between Guess 1 and Guess 2, then updates; then Guess 2 and Guess 3, then updates. It moves forward like a rolling wave of math.
As interesting as this encounter with AI was to me, I recognize its narrow specificity and apologize for any resources destroyed in the satisfaction of my curiosity.





