Although I respect your strategy and intent, @kritiper, no one’s recollection – or spelling, for that matter – is perfect, and it is a poor strategy to refuse to play a high-scoring word because of niggling uncertainty about its spelling, and a consideration that it might not be perfect. Since it’s illegal (according to the rules of the game) to look up the word in a dictionary prior to playing it, the better strategy would be to make the play confidently, “knowing” that the spelling is correct, and in that way daring the opponent to risk an uncertain challenge if his own spelling is not up to par.
I also don’t knowingly play words that I know to be false, to be Proper Nouns or Names (and therefore forbidden) or to be misspelled – because I play with good players and knowledgeable wordsmiths who WILL challenge misspellings – but I also won’t shy from playing a word that I “believe” to be correct, even though I’m not 100% positive. If it’s a good play and I think that I can pull it off, then I’ll make it – with confidence! – and look it up after the game is over. But if I’m looking for a potential 50+ point word play that depends on whether or not “AIN” is a legal word (it is), then I’ll take the chance, make the play and learn from the experience.
When playing Scrabble against hard-core, determined and experienced players, one learns to make the best scores not by playing the “intersecting” words that are the defining mark of the game, that is, “T-words” that share only one letter as a word crosses another word, but by laying words against each other, which means an extraordinary number of two-letter and three-letter words. Although I used to beat my daughter pretty handily at this game even after she graduated from college, she gives me a run for the brass ring now, since she has actually memorized all of the legal two-letter and three-letter words, sounds and dipthongs that Scrabble permits as “legal words”. It’s hard to win against her now, because she has taken my best moves. Fortunately, my vocabulary is still somewhat wider than hers, though, and sometimes I have to take advantage with a FRAMMIS or two. (No, that’s not a word in Scrabble.)
We’re not talking “life ethics” here; we’re talking about a board game. And games should be played as games, using whatever strategy is permitted by the rules.
Personally, I’d prefer to have the rules changed to include a requirement that the player should be able to DEFINE every word played, though.