Opener Lab
Compare ISSEI
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How ISSEI performs
Played first, ISSEI removes about 86.7% of the possible-answer list on average and scores 3.51 bits of information. It is not on the possible-answer list, but it can still be useful because of the feedback groups it creates.
Tried against 1,859 past Wordle answers, ISSEI left an average of 319 possible answers standing after the first guess. Its largest group in that replay came on July 19, 2026, when the answer was CHURN and 592 candidates survived.
First-guess odds
| Outcome | ISSEI |
|---|---|
| First-turn solve* | 0% |
| At least one green | 18.4% |
| Any green or yellow | 74.9% |
| Whole row gray | 25.1% |
| Worst case answers left | 592 |
*Treating every word in the possible-answer list as equally likely.