r1bk3r/1p3qp1/p6n/P2pn2p/3pp3/NPP2P1P/4P3/R1B1KBNR w Q - 0 21
FEN state: r1bk3r/1p3qp1/p6n/P2pn2p/3pp3/NPP2P1P/4P3/R1B1KBNR w Q - 0 21 ; Best move: c3d4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8 and black rook at h8. Black pawn at b7, black queen at f7 and black pawn at g7. Black pawn at a6 and black knight at h6. White pawn at a5, black pawn at d5, black knight at e5 and black pawn at h5. Black pawn at d4 and black pawn at e4. White knight at a3, white pawn at b3, white pawn at c3, white pawn at f3 and white pawn at h3. White pawn at e2. White rook at a1, white bishop at c1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.