rq2kbr1/p1pp2p1/1p1np2n/5p1p/1PP1bP2/3PP2N/P1QK2PP/RNB2B1R w q - 6 15
FEN state: rq2kbr1/p1pp2p1/1p1np2n/5p1p/1PP1bP2/3PP2N/P1QK2PP/RNB2B1R w q - 6 15 ; Best move: d3e4
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7, black pawn at d7 and black pawn at g7. Black pawn at b6, black knight at d6, black pawn at e6 and black knight at h6. Black pawn at f5 and black pawn at h5. White pawn at b4, white pawn at c4, black bishop at e4 and white pawn at f4. White pawn at d3, white pawn at e3 and white knight at h3. White pawn at a2, white queen at c2, white king at d2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 6. Full move number is 15. White to move.