r5nr/pb1kbp1p/1p1p2P1/2pPp1N1/1B6/PP2PK2/2P2PP1/RNQ2B1q w - - 1 21
FEN state: r5nr/pb1kbp1p/1p1p2P1/2pPp1N1/1B6/PP2PK2/2P2PP1/RNQ2B1q w - - 1 21 ; Best move: f1b5
The current state of the chess board is: Black rook at a8, black knight at g8 and black rook at h8. Black pawn at a7, black bishop at b7, black king at d7, black bishop at e7, black pawn at f7 and black pawn at h7. Black pawn at b6, black pawn at d6 and white pawn at g6. Black pawn at c5, white pawn at d5, black pawn at e5 and white knight at g5. White bishop at b4. White pawn at a3, white pawn at b3, white pawn at e3 and white king at f3. White pawn at c2, white pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, white queen at c1, white bishop at f1 and black queen at h1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. White to move.