User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-82.178.42.183-20140208044915/@comment-16281343-20140212033648

Only the Rooks and the Knights are confirmed to be dead.

The pawns are just restrained after they are defeated. "The Pawns who couldn’t move got their demonic-powers sealed by Koneko-chan’s senjutsu, and used Gasper’s vampire ability to make them lose consciousness so we can tie them to a pillar."

The Queen and Bishops may or may not have survived.