r1b1kbn1/4n1p1/pp2pp1r/2p5/1P1B2p1/N2P1P2/P1P1PQP1/2R1KBNq b q - 7 21
FEN state: r1b1kbn1/4n1p1/pp2pp1r/2p5/1P1B2p1/N2P1P2/P1P1PQP1/2R1KBNq b q - 7 21 ; Best move: c5d4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black knight at g8. Black knight at e7 and black pawn at g7. Black pawn at a6, black pawn at b6, black pawn at e6, black pawn at f6 and black rook at h6. Black pawn at c5. White pawn at b4, white bishop at d4 and black pawn at g4. White knight at a3, white pawn at d3 and white pawn at f3. White pawn at a2, white pawn at c2, white pawn at e2, white queen at f2 and white pawn at g2. White rook at c1, white king at e1, white bishop at f1, white knight at g1 and black queen at h1. Black queenside is the only castle move available. Half move number is 7. Full move number is 21. Black to move.