rn3k1r/ppqb1p1p/3b1n2/2pppPp1/PP5P/B1P1P2N/3P2PR/RN1QKB2 b Q - 4 13
FEN state: rn3k1r/ppqb1p1p/3b1n2/2pppPp1/PP5P/B1P1P2N/3P2PR/RN1QKB2 b Q - 4 13 ; Best move: e5e4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black queen at c7, black bishop at d7, black pawn at f7 and black pawn at h7. Black bishop at d6 and black knight at f6. Black pawn at c5, black pawn at d5, black pawn at e5, white pawn at f5 and black pawn at g5. White pawn at a4, white pawn at b4 and white pawn at h4. White bishop at a3, white pawn at c3, white pawn at e3 and white knight at h3. White pawn at d2, white pawn at g2 and white rook at h2. White rook at a1, white knight at b1, white queen at d1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 4. Full move number is 13. Black to move.