The Zimbabwe cricketers are 187 for seven in their second innings, a lead of 442 after three days of the first test against Bangladesh in Harare.
Captain Brendan Taylor is unbeaten on 81.
Bangladesh already require a world-record score to win the match.
After the first two days of the match had produced a combined total of 484 runs and 11 wickets, at one stage the third day saw 11 wickets fall for the addition of just 48 runs.
That was largely due to an embarrassing collapse by Bangladesh, who began the day on 95 for one but were bowled out for 134 shortly after lunch to give Zimbabwe a first-innings lead of 255.