If I make a XOR circuit with 4 NAND gates it says I can do better. My 3 gate solution is to use an AND, OR, and NAND gate which would have been 6 NAND gates. However it gives me full marks for my 3 gate solution.
Yeah it currently only compares the solutions towards the minimum number of components of any type. I also intend to compare against the minimum number of nand gates overall, but this is not yet supported.