Opener Lab
Compare KERFS
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How KERFS performs
Played first, KERFS removes about 91.4% of the possible-answer list on average and scores 4.35 bits of information. Its first-turn information ranks #8,655 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, KERFS left an average of 202 possible answers standing after the first guess. Its largest group in that replay came on July 18, 2026, when the answer was BOOTH and 472 candidates survived.
First-guess odds
| Outcome | KERFS |
|---|---|
| First-turn solve* | 0% |
| At least one green | 20.1% |
| Any green or yellow | 80.0% |
| Whole row gray | 20.0% |
| Worst case answers left | 472 |
*Treating every word in the possible-answer list as equally likely.