Please can you type the clue again. If it's "game for more than 1" then does it refr to the answer to clue number one. Do you have any letters? I'm not sure why chess springs to mind when it could be one of so many games- does it fit with other letters?
factor 30, the only reason chess springs to mind is , it has five letters! that is how brain dead i am this morning! i think forgiveness is required for confusing everybody!
if it helps any, 1a is 'not cricket'
not sure how 13a comes into it, but the clue for that is , king and knight greeting rogue, i have knave. these postings have made today's crossword more fun than usual!