Spelling obviously is important in Chi, as it is in any word game, but, to me, being able to produce all forms of the word is every bit as important.
Take as an example the recent dispatched 10-letter game.
237 (from 301) played the word ditch, but only 216 played the past tense form ditched and only 126 played ditches.
patch and patched both had 254 hits, but the plural patches had only 133.
pitch, pitched and pitches had similar scores - 249, 250 and 135 respectively.
Is it possible that some players don't realise that plural forms with -es are allowed in Chi?