Opener Lab
Compare STACK
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How STACK performs
Played first, STACK removes about 91.4% of the possible-answer list on average and scores 4.63 bits of information. Its first-turn information ranks #5,857 out of 14,855 Wordle guesses tested. Roughly 32% of the time at least one letter lands in the right spot.
Tried against 1,858 past Wordle answers, STACK left an average of 202 possible answers standing after the first guess. Its largest group in that replay came on July 20, 2026, when the answer was DIVER and 534 candidates survived. It has been the daily answer once.
First-guess odds
| Outcome | STACK |
|---|---|
| First-turn solve* | 0.04% |
| At least one green | 32.0% |
| Any green or yellow | 77.4% |
| Whole row gray | 22.6% |
| Worst case answers left | 534 |
*Treating every word in the possible-answer list as equally likely.