r1b2b1r/pp1kp1pp/nq1p3n/5p2/2p1P2P/1P1B1Q1R/P1PP1PP1/RNB1K1N1 w Q - 4 9
FEN state: r1b2b1r/pp1kp1pp/nq1p3n/5p2/2p1P2P/1P1B1Q1R/P1PP1PP1/RNB1K1N1 w Q - 4 9 ; Best move: b3c4
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black king at d7, black pawn at e7, black pawn at g7 and black pawn at h7. Black knight at a6, black queen at b6, black pawn at d6 and black knight at h6. Black pawn at f5. Black pawn at c4, white pawn at e4 and white pawn at h4. White pawn at b3, white bishop at d3, white queen at f3 and white rook at h3. White pawn at a2, white pawn at c2, white pawn at d2, white pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white king at e1 and white knight at g1. White queenside is the only castle move available. Half move number is 4. Full move number is 9. White to move.