Nottinghamshire lost five wickets in the evening session as they eked out a slender lead over Warwickshire at the end of the third day of their Specsavers County Championship match.
The Bears put the home side under pressure after compiling 488 in their first innings, in response to Notts' 498.
Notts had high hopes of being able to force their first win of the campaign but ended the day on 105 with half of their side back in the pavilion.
Joe Clarke remains unbeaten overnight on 59.
Earlier, Dominic Sibley carried his bat with a chanceless knock of 215 not out.
The 24-year-old Warwickshire opener was at the crease for six and half hours and hit 30 boundaries from the 420 balls he faced.
His unbeaten effort was the first time a Warwickshire opener had carried his bat against Notts since Michael Powell in 1998.
Steven Mullaney, the Notts captain, achieved figures of four for 48.
Watch highlights from day three above.
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