Opener Lab

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83.2%

of words eliminated

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How EFFER performs

Played first, EFFER removes about 83.2% of the possible-answer list on average and scores 3.43 bits of information. Its first-turn information ranks #14,000 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 1,877 past Wordle answers, EFFER left an average of 390 possible answers standing after the first guess. Its largest group in that replay came on August 5, 2026, when the answer was POSIT and 783 candidates survived.

First-guess odds

Outcome	EFFER
First-turn solve*	0%
At least one green	20.0%
Any green or yellow	66.8%
Whole row gray	33.2%
Worst case answers left	783

*Treating every word in the possible-answer list as equally likely.

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Understanding results

Elimination %: How much of the possible-answer list the guess rules out on average.
Avg turns: Average guesses needed by the same solver in games it finished within six.
Win rate: Share of answers the solver finished within six guesses.
Information: First-turn entropy in bits; higher means more informative feedback on average.
Tier: A band for first-turn information only: S is 5.8 bits or more, A 5.4, B 4.8, C 4.0, F below that. It describes the opening row, so a tier A word can still lead the six-turn table below.

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How EFFER performs

First-guess odds