Opener Lab
Compare BIRLS
Pick a word to compare against.
How BIRLS performs
Played first, BIRLS removes about 93.6% of the possible-answer list on average and scores 4.80 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, BIRLS left an average of 153 possible answers standing after the first guess. Its largest group in that replay came on July 9, 2026, when the answer was AMEND and 342 candidates survived.
First-guess odds
| Outcome | BIRLS |
|---|---|
| First-turn solve* | 0% |
| At least one green | 28.8% |
| Any green or yellow | 85.5% |
| Whole row gray | 14.5% |
| Worst case answers left | 342 |
*Treating every word in the possible-answer list as equally likely.