Simple chess bot

Question

Inspired by this

Implement simple chess bot (with console or GUI) that has following features:

1. [Pseudo-]graphically showing the board;
2. Accepting user moves and making their own moves;
3. Playing by basic chess rules (not doing illegal moves);
4. Making at least minimally reasonable moves (no random moves, a player making random valid moves against the bot should lose most times).

In general, implement something like "SedChess" (linked above) in minimum number of bytes.

Optional:

1. Advances rules like castling, stalemate detection, en passant, etc;
2. Checking validity of user inputs;
3. Analysing more than 1 move in depth;

Limitations:

1. No networking;
2. No dependance on chess-specific libraries (unless they are included in the language and language's standard library) or programs;
3. No lame tricks like showing two boards and requesting user play two games (with himself).