r3kb2/p1p1p2n/1p2q1r1/1b1p2pp/2PPpP1P/PP1nK1P1/7R/RNB1QBN1 w q - 3 21
FEN state: r3kb2/p1p1p2n/1p2q1r1/1b1p2pp/2PPpP1P/PP1nK1P1/7R/RNB1QBN1 w q - 3 21 ; Best move: f1d3
The current state of the chess board is: Black rook at a8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at c7, black pawn at e7 and black knight at h7. Black pawn at b6, black queen at e6 and black rook at g6. Black bishop at b5, black pawn at d5, black pawn at g5 and black pawn at h5. White pawn at c4, white pawn at d4, black pawn at e4, white pawn at f4 and white pawn at h4. White pawn at a3, white pawn at b3, black knight at d3, white king at e3 and white pawn at g3. White rook at h2. White rook at a1, white knight at b1, white bishop at c1, white queen at e1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 3. Full move number is 21. White to move.