r1b1qbnr/p2np1p1/1p3k2/1Ppp1p1p/7P/P4NP1/1NPPPP2/1RBQKB1R b K - 4 10
FEN state: r1b1qbnr/p2np1p1/1p3k2/1Ppp1p1p/7P/P4NP1/1NPPPP2/1RBQKB1R b K - 4 10 ; Best move: c8b7
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black knight at d7, black pawn at e7 and black pawn at g7. Black pawn at b6 and black king at f6. White pawn at b5, black pawn at c5, black pawn at d5, black pawn at f5 and black pawn at h5. White pawn at h4. White pawn at a3, white knight at f3 and white pawn at g3. White knight at b2, white pawn at c2, white pawn at d2, white pawn at e2 and white pawn at f2. White rook at b1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white rook at h1. White kingside is the only castle move available. Half move number is 4. Full move number is 10. Black to move.