I just finished that duelist vs. a halberd fighter with Distance Fighting, Poll-axe Fighting, Side Step, and Slip-Thrust. The polearm fighter dominated this one. He started every round with slip-thrust and the duelist kept moving away. Polearm guy just ignored the armor and punched through several times, effectively hitting for 3d6-1 with artful strike and armor factored in. He even voluntarily took damage just so he had more MP for attack to finish off his enemy. Duelist was unlucky with most of his Mezzo Tempo attacks. Battle lasted 7 rounds (which seems typical in my battles).