touch and go (?.)

• blind bargain
• borderline case
• chance
• chance at odds
• contingency
• double contingency
• even break
• even chance
• fair shake
• fifty-fifty
• gamble
• gambling chance
• guess
• half a chance
• matter of chance
• odds
• open question
• piece of guesswork
• potluck
• potshot
• question
• random shot
• sight-unseen transaction
• sporting chance
• square odds
• standoff
• toss
• toss-up
• undecided issue
• wager