A season's-best 187 not out from opener Varun Chopra helped reigning champions Warwickshire dominate winless Surrey in reaching 359-3 on the opening day at Guildford.
The former Essex player survived a sticky start after Warwickshire elected to take first use of the pitch, batting through the day to reach his second championship century of the campaign and his third in all first-class matches this summer.
In the process Chopra also surpassed his previous best for 2013 of 163, scored against in the MCC versus Champions match in Abu Dhabi in March.
Chopra joined forces with Ian Westwood to post 153 for the first wicket - the best opening stand for Warwickshire this season.
Having toiled away for the best part of three hours in the warmest conditions of the summer thus far, Surrey finally broke the visitors' first-wicket stand after 43.5 overs.
Left-hander Westwood (71), rocking back when attempting to cut a length-ball from left-arm spinner Gary Keedy, saw the ball turn sharply from the bowlers' rough, clip the top of leg stump and make it 153-1.
Only 25 runs and 11 overs later, William Porterfield's poor form continued when he went for 11, aiming an expansive cover drive against Zander De Bruyn and edging the ball onto his stumps to bring in Jim Troughton, another of the Bears top-order left-hander's struggling for consistency.
Two balls after tea and without adding to his interval score of nine Troughton, looking to push drive a short ball from Stuart Meaker through the covers, dragged onto his stumps to exit with his side on 208-3.
Half an hour after tea Surrey replaced Jonathan Lewis, who had sent down 18 wicketless overs for 40 runs, with Jade Dernbach who, after his release from the England one-day squad on duty at Trent Bridge, drove from Nottingham to take Surrey's second new ball on his home town ground.
But the Warwickshire fourth-wicket pair had little trouble in making it through to the close with Chopra unbowed just 13 short of double hundred and Amrose on 64 not out, and with power to add to their unbroken stand worth 151 on day two.