Opener Lab
Compare REFFO
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How REFFO performs
Played first, REFFO removes about 89.6% of the possible-answer list on average and scores 3.94 bits of information. Its first-turn information ranks #11,909 out of 14,855 Wordle guesses tested. It is not on the possible-answer list, but it can still be useful because of the feedback groups it creates.
Tried against 1,858 past Wordle answers, REFFO left an average of 242 possible answers standing after the first guess. Its largest group in that replay came on July 15, 2026, when the answer was PSHAW and 503 candidates survived.
First-guess odds
| Outcome | REFFO |
|---|---|
| First-turn solve* | 0% |
| At least one green | 17.5% |
| Any green or yellow | 78.7% |
| Whole row gray | 21.3% |
| Worst case answers left | 503 |
*Treating every word in the possible-answer list as equally likely.