r1bk3r/2pp1ppp/3b3n/pp4q1/1P1nPpP1/1QPPB2P/P6R/RN1BK1N1 w Q - 0 18
FEN state: r1bk3r/2pp1ppp/3b3n/pp4q1/1P1nPpP1/1QPPB2P/P6R/RN1BK1N1 w Q - 0 18 ; Best move: e3d4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8 and black rook at h8. Black pawn at c7, black pawn at d7, black pawn at f7, black pawn at g7 and black pawn at h7. Black bishop at d6 and black knight at h6. Black pawn at a5, black pawn at b5 and black queen at g5. White pawn at b4, black knight at d4, white pawn at e4, black pawn at f4 and white pawn at g4. White queen at b3, white pawn at c3, white pawn at d3, white bishop at e3 and white pawn at h3. White pawn at a2 and white rook at h2. White rook at a1, white knight at b1, white bishop at d1, white king at e1 and white knight at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 18. White to move.