Opener Lab
Compare BIRSY
Pick a word to compare against.
How BIRSY performs
Played first, BIRSY removes about 92.5% of the possible-answer list on average and scores 4.65 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, BIRSY left an average of 184 possible answers standing after the first guess. Its largest group in that replay came on July 17, 2026, when the answer was LEGAL and 436 candidates survived.
First-guess odds
| Outcome | BIRSY |
|---|---|
| First-turn solve* | 0% |
| At least one green | 38.3% |
| Any green or yellow | 81.5% |
| Whole row gray | 18.5% |
| Worst case answers left | 436 |
*Treating every word in the possible-answer list as equally likely.