r1bk2nr/pqp5/5pnp/Pp1p1Pp1/2BPQ1PP/P3B3/R1P5/4KNNR w K - 2 21
FEN state: r1bk2nr/pqp5/5pnp/Pp1p1Pp1/2BPQ1PP/P3B3/R1P5/4KNNR w K - 2 21 ; Best move: c4d5
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8, black knight at g8 and black rook at h8. Black pawn at a7, black queen at b7 and black pawn at c7. Black pawn at f6, black knight at g6 and black pawn at h6. White pawn at a5, black pawn at b5, black pawn at d5, white pawn at f5 and black pawn at g5. White bishop at c4, white pawn at d4, white queen at e4, white pawn at g4 and white pawn at h4. White pawn at a3 and white bishop at e3. White rook at a2 and white pawn at c2. White king at e1, white knight at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 2. Full move number is 21. White to move.