r2qk3/nbppp1r1/7n/p1P2pp1/P2N3p/1p2PP1Q/1R1P2PP/1NB1KB1R w q - 1 21
FEN state: r2qk3/nbppp1r1/7n/p1P2pp1/P2N3p/1p2PP1Q/1R1P2PP/1NB1KB1R w q - 1 21 ; Best move: d4f5
The current state of the chess board is: Black rook at a8, black queen at d8 and black king at e8. Black knight at a7, black bishop at b7, black pawn at c7, black pawn at d7, black pawn at e7 and black rook at g7. Black knight at h6. Black pawn at a5, white pawn at c5, black pawn at f5 and black pawn at g5. White pawn at a4, white knight at d4 and black pawn at h4. Black pawn at b3, white pawn at e3, white pawn at f3 and white queen at h3. White rook at b2, white pawn at d2, white pawn at g2 and white pawn at h2. White knight at b1, white bishop at c1, white king at e1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.