Steamers flanker Johan Bardoul, who has had a fine ITM Cup, then finished off a slick move, started by second-five Doug Edwards, with a bustling 20 metre run to score in the corner. Steamers up 12-0.
Auckland turned over the ball again in tough contact. Evemy was so close to scoring the Steamers third try, but in a photo finish with Auckland's Simon Hickey, knocked on just short in the slippery conditions.
The last play in the half was frantic, with Steamers mobile lock Tim Bond making two spritely 20 metre runs and openside flanker Hamish Gosling stealing Auckland ball, but the under-par Aucks cleared to touch to finish the best 40 minutes of the Bay of Plenty season.
Auckland started the second spell a different team with a freshening breeze behind them. Anscombe kicked a penalty and then uber-talented Lolagi Visinia shocked the Steamers with an opportunistic try from the kick-off. The conversion went over to change the game's complexion, and the Steamers lead to just two points.
Steamers fullback Leroy Van Dam's inability to catch the high ball continued, which proved costly as Anscombe kicked a mighty 48 metre penalty to give Auckland the lead after 48 minutes.
Nemani also spilled a high kick to give Auckland the chance to counter quickly, with young Visinia cleverly scoring under pressure from three defenders.
Auckland had 18 points in just 14 minutes and it was the Steamers who were now making errors under pressure. Anscombe capitalised, stretching the lead to 27-12 from the tee, and the Steamers left wondering what hit them in the second half.
Auckland 27 (Lolagi Visinia 2 tries; Gareth Anscombe con, 5 pen)
Bay of Plenty 12 (Joe Royal, Johan Bardoul tries; Nic Evemy con)