06/08/2019 - Defense

Hello! I've added a defense trainer. You'll be presented with opponents in riichi, and have to discard tiles from your hand until the wall runs out. Like in the efficiency trainer, you'll be evaluated on your choices, only this time, it's how safe the discard is, instead of how efficient it is. Hopefully it helps you fold with greater ease! Access it by clicking the button labelled "Folding" along the top bar.

Additionally, I added a small optimization for the shanten calculation. In my testing, the Explorer now produces results twice as quickly, making it a bit more usable.