Battle on 64 squares

People often tell me that I waste my moves. ‘No Mercy’ is what I ought to follow. By sparing the life of one, I might get killed myself. Strategy counts and any mistake is indispensable for the enemy.
I am supreme. I am the commander of my forces. If I die, my men die. But if I’m winning, I kill anyone and everyone that comes in my way. A little knowledge is dangerous. But if your Lady is with you and the knowledge is applied on her, YOU are dangerous! There’s no stopping you! A challenge may come only, if you have to face the enemy’s Lady. But as said, a little knowledge is dangerous. The battle ends fast, ends slow. Takes hours, or even minutes! Such a battle has no blood, no corpses, and most of all, no weapons. You better beware, or… you’re DEAD! But then again, a little knowledge is dangerous. This battle is no ordinary one. In fact it is nothing like the ‘real’ one. It is fought between the tanned and the fair. No matter who you are in the battle, save yourself and don’t spare the enemy. Or else….
You’re CHECKMATED!