rnbq2r1/2pkp1b1/p4p2/3p3p/PP3P1P/1Q4RN/2PP1nP1/RNB1K3 b Q - 4 20
FEN state: rnbq2r1/2pkp1b1/p4p2/3p3p/PP3P1P/1Q4RN/2PP1nP1/RNB1K3 b Q - 4 20 ; Best move: f2e4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black queen at d8 and black rook at g8. Black pawn at c7, black king at d7, black pawn at e7 and black bishop at g7. Black pawn at a6 and black pawn at f6. Black pawn at d5 and black pawn at h5. White pawn at a4, white pawn at b4, white pawn at f4 and white pawn at h4. White queen at b3, white rook at g3 and white knight at h3. White pawn at c2, white pawn at d2, black knight at f2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1 and white king at e1. White queenside is the only castle move available. Half move number is 4. Full move number is 20. Black to move.