The Bishop Pickaxe break blocks diagonally.
After your pawn pickaxe has been broken, you will receive a broken pawn pickaxe. Put the broken pickaxe on top and a bishop/rook/knight totem at the bottom, click the hammer icon, and you will receive a corresponding tool. It's the same for others.
The Queen Pickaxe would break the blocks in a 5*5 area.
Basically the origin of this idea.
Well, this looks cool.
A display of all the items so far.
The Rook Pickaxe will break block in a cross.
The knight pickaxe will break the blocks in a line.
It breaks block in a 3*3 area, and has almost infinite durability.