1nbq1k1r/4r3/pp2pnP1/2pp3p/2PP1pP1/BP5R/PQ2PP1N/RN2KB2 w Q - 0 20
FEN state: 1nbq1k1r/4r3/pp2pnP1/2pp3p/2PP1pP1/BP5R/PQ2PP1N/RN2KB2 w Q - 0 20 ; Best move: b1c3
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8, black king at f8 and black rook at h8. Black rook at e7. Black pawn at a6, black pawn at b6, black pawn at e6, black knight at f6 and white pawn at g6. Black pawn at c5, black pawn at d5 and black pawn at h5. White pawn at c4, white pawn at d4, black pawn at f4 and white pawn at g4. White bishop at a3, white pawn at b3 and white rook at h3. White pawn at a2, white queen at b2, white pawn at e2, white pawn at f2 and white knight at h2. White rook at a1, white knight at b1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.