1r1q3r/p1p1kp1p/1pnp1np1/2b1p3/P2P2bP/N1P5/1P2PPPR/R1BQKBN1 w Q - 1 13
FEN state: 1r1q3r/p1p1kp1p/1pnp1np1/2b1p3/P2P2bP/N1P5/1P2PPPR/R1BQKBN1 w Q - 1 13 ; Best move: d4c5
The current state of the chess board is: Black rook at b8, black queen at d8 and black rook at h8. Black pawn at a7, black pawn at c7, black king at e7, black pawn at f7 and black pawn at h7. Black pawn at b6, black knight at c6, black pawn at d6, black knight at f6 and black pawn at g6. Black bishop at c5 and black pawn at e5. White pawn at a4, white pawn at d4, black bishop at g4 and white pawn at h4. White knight at a3 and white pawn at c3. White pawn at b2, white pawn at e2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 1. Full move number is 13. White to move.