r1bqkn2/p2pp1rp/1pp2P1b/6P1/Pn1PN1P1/1P2KQ2/2P2P2/1RB2N1R b q - 0 21
FEN state: r1bqkn2/p2pp1rp/1pp2P1b/6P1/Pn1PN1P1/1P2KQ2/2P2P2/1RB2N1R b q - 0 21 ; Best move: d7d5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black knight at f8. Black pawn at a7, black pawn at d7, black pawn at e7, black rook at g7 and black pawn at h7. Black pawn at b6, black pawn at c6, white pawn at f6 and black bishop at h6. White pawn at g5. White pawn at a4, black knight at b4, white pawn at d4, white knight at e4 and white pawn at g4. White pawn at b3, white king at e3 and white queen at f3. White pawn at c2 and white pawn at f2. White rook at b1, white bishop at c1, white knight at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.