1nb1kbnr/r2qpp2/2pp2pp/pp6/P2PPB2/5P2/1PPK2PP/RNQ2BNR b k - 2 10
FEN state: 1nb1kbnr/r2qpp2/2pp2pp/pp6/P2PPB2/5P2/1PPK2PP/RNQ2BNR b k - 2 10 ; Best move: b5b4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black rook at a7, black queen at d7, black pawn at e7 and black pawn at f7. Black pawn at c6, black pawn at d6, black pawn at g6 and black pawn at h6. Black pawn at a5 and black pawn at b5. White pawn at a4, white pawn at d4, white pawn at e4 and white bishop at f4. White pawn at f3. White pawn at b2, white pawn at c2, white king at d2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white queen at c1, white bishop at f1, white knight at g1 and white rook at h1. Black kingside is the only castle move available. Half move number is 2. Full move number is 10. Black to move.