rn1k3r/1bpn1pp1/pp5p/1Q2p3/1b1Pp2q/8/PPPNPPP1/R1B1KB1R w Q - 4 13
FEN state: rn1k3r/1bpn1pp1/pp5p/1Q2p3/1b1Pp2q/8/PPPNPPP1/R1B1KB1R w Q - 4 13 ; Best move: b5d7
The current state of the chess board is: Black rook at a8, black knight at b8, black king at d8 and black rook at h8. Black bishop at b7, black pawn at c7, black knight at d7, black pawn at f7 and black pawn at g7. Black pawn at a6, black pawn at b6 and black pawn at h6. White queen at b5 and black pawn at e5. Black bishop at b4, white pawn at d4, black pawn at e4 and black queen at h4. White pawn at a2, white pawn at b2, white pawn at c2, white knight at d2, white pawn at e2, white pawn at f2 and white pawn at g2. White rook at a1, white bishop at c1, white king at e1, white bishop at f1 and white rook at h1. White queenside is the only castle move available. Half move number is 4. Full move number is 13. White to move.