rnbqkb1r/p1p4p/1p3p2/3ppnpP/2P2P2/NP1BP3/P2PK1P1/R1BQ2NR b q - 0 10
FEN state: rnbqkb1r/p1p4p/1p3p2/3ppnpP/2P2P2/NP1BP3/P2PK1P1/R1BQ2NR b q - 0 10 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at c7 and black pawn at h7. Black pawn at b6 and black pawn at f6. Black pawn at d5, black pawn at e5, black knight at f5, black pawn at g5 and white pawn at h5. White pawn at c4 and white pawn at f4. White knight at a3, white pawn at b3, white bishop at d3 and white pawn at e3. White pawn at a2, white pawn at d2, white king at e2 and white pawn at g2. White rook at a1, white bishop at c1, white queen at d1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 10. Black to move.