gamble, wager, venture, pot, ante, hazard, tossup, stake, speculation, betting, play, raffle, odds, uncertainty, tossup, chance, random shot, lottery, fortune, lot, game of chance, sweepstake(s), risk, flier*, long shot*, shot in the dark*, blind bargain*, roll of the dice*, plunge*, pig in a poke*, crapshoot*, piece of the action*.

wager, gamble, stake, bet on, back, bet against, venture, hazard, trust, play against, speculate, tempt fortune, play for, put money on, lay money down, dice, flip a coin, toss up, risk, game, chance, ante, make a bet, put up, take a chance, try one's luck, take a flier*, declare oneself in*, lay down*, buy in on*, plank down*, post*, punt*, play the ponies*, pony up*, lay odds*, lay even money*, make book*.

certainly, by all means; yes, indeed; see surely, yes.