User blog comment:AhmaddamhA/Change in Issei's Evil Pieces./@comment-1359322-20160701020804/@comment-24.113.252.213-20160701075736

1.) It's literally impossible for a Pawn to become a King, in real Chess, or the Rating Game.

2.) Ajuka just made adjustments to Issei's Evil Pieces in Vol. 8 to prevent them from malfunctioning as a result of being exposed to Ddraig's power (Juggernaut Drive from Vol.6). This made it possible for Issei to Promote whenever, wherever he wanted, and allowed him to access some of Ddraig's power (Illegal Move Triaina) without using Juggernaut Drive. And Cardinal Crimson Promotion is him accessing Ddraig's full power through his "Promoted to Queen" Pawn piece(s).

Issei has 8 Pawn pieces. 4 of them are regular pieces and represent his own power. he can use those to promote himself.

Is remaining 4 pieces are Mutation pieces and represent Ddraig's power. While each one is a pawn piece, they each represent a different piece that corresponds to Ddraig's power:

Knight: Some of Ddraig's power is converted into speed.

Bishop: Some of Ddraig's power is converted into, or used to enhance magical/demonic power.

Rook: Some of Ddraig's power is converted into strength and endurence.

Queen: All of Ddraig's power is brought out for full use.