r1bq1k1r/ppp1n1pp/3pp2n/5p2/1b1P2P1/4P1NN/PPPB1P1P/R2QKBR1 b Q - 0 10
FEN state: r1bq1k1r/ppp1n1pp/3pp2n/5p2/1b1P2P1/4P1NN/PPPB1P1P/R2QKBR1 b Q - 0 10 ; Best move: b4d2
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black knight at e7, black pawn at g7 and black pawn at h7. Black pawn at d6, black pawn at e6 and black knight at h6. Black pawn at f5. Black bishop at b4, white pawn at d4 and white pawn at g4. White pawn at e3, white knight at g3 and white knight at h3. White pawn at a2, white pawn at b2, white pawn at c2, white bishop at d2, white pawn at f2 and white pawn at h2. White rook at a1, white queen at d1, white king at e1, white bishop at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 10. Black to move.