1rb2b1r/ppp1nkp1/4p2p/2Bpn3/P1NP1pP1/1P5P/2P1PP1R/R2QKBN1 w Q - 1 13
FEN state: 1rb2b1r/ppp1nkp1/4p2p/2Bpn3/P1NP1pP1/1P5P/2P1PP1R/R2QKBN1 w Q - 1 13 ; Best move: c4e5
The current state of the chess board is: Black rook at b8, black bishop at c8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black knight at e7, black king at f7 and black pawn at g7. Black pawn at e6 and black pawn at h6. White bishop at c5, black pawn at d5 and black knight at e5. White pawn at a4, white knight at c4, white pawn at d4, black pawn at f4 and white pawn at g4. White pawn at b3 and white pawn at h3. White pawn at c2, white pawn at e2, white pawn at f2 and white rook at h2. White rook at a1, 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.