r1b1kbr1/3qpppp/n2p4/2p5/Q1p4P/P2P4/n1K1PP1B/RN3BNR w q - 3 18
FEN state: r1b1kbr1/3qpppp/n2p4/2p5/Q1p4P/P2P4/n1K1PP1B/RN3BNR w q - 3 18 ; Best move: a4c4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black queen at d7, black pawn at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black knight at a6 and black pawn at d6. Black pawn at c5. White queen at a4, black pawn at c4 and white pawn at h4. White pawn at a3 and white pawn at d3. Black knight at a2, white king at c2, white pawn at e2, white pawn at f2 and white bishop at h2. White rook at a1, white knight at b1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 3. Full move number is 18. White to move.