Knight and Pawns are strong. YOLOwing a Pawn forward looks like a good strategy. (YMMV) I'm scared to move my Knights.
In the default mode, I check the King with a Maenad but the AI didn't move it, so I won. I'm not sure what happened. From a previous project of Chess with very rules, one problem with the AI is that when it has a very bad losing position it does not even try, so when I'm lucky to get enough advantage the AI just lose everything with stupid moves.
In this case, I already have an advantage, probably a Mead, half a Pirate and a few Pawns, after successfully YOLOwing a Pawn. Perhaps you shoud add some training to the AI to avoid direct King capture.