[tgnjnwcj] Endgame trainer

Create a computer game that lets you practice defending theoretically lost chess endgames.  If the position is an "easy" win for the computer, for example, Distance To Conversion less than N, then the computer plays perfectly.  If not, it chooses a random move (not necessarily the best move).

Use Monte Carlo to select moves non-uniformly randomly.  The computer puts you in positions in which it is more likely you make a mistake (within the next X moves).

Goal is to survive as long as possible.  Possibly even win.