rnb2rk1/ppqp2p1/1n3p2/1Pp1p2p/Q1N4P/5PP1/PP1PP2R/R1B1KBN1 b Q - 0 13
FEN state: rnb2rk1/ppqp2p1/1n3p2/1Pp1p2p/Q1N4P/5PP1/PP1PP2R/R1B1KBN1 b Q - 0 13 ; Best move: b6a4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black rook at f8 and black king at g8. Black pawn at a7, black pawn at b7, black queen at c7, black pawn at d7 and black pawn at g7. Black knight at b6 and black pawn at f6. White pawn at b5, black pawn at c5, black pawn at e5 and black pawn at h5. White queen at a4, white knight at c4 and white pawn at h4. White pawn at f3 and white pawn at g3. White pawn at a2, white pawn at b2, white pawn at d2, white pawn at e2 and white rook at h2. White rook at a1, white bishop at c1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 13. Black to move.