r1b1k1r1/pQ1nb3/3p3N/3P3P/1p2p1p1/4P2P/PP1PKP2/RNB2B1R w q - 0 18
FEN state: r1b1k1r1/pQ1nb3/3p3N/3P3P/1p2p1p1/4P2P/PP1PKP2/RNB2B1R w q - 0 18 ; Best move: b7a8
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at g8. Black pawn at a7, white queen at b7, black knight at d7 and black bishop at e7. Black pawn at d6 and white knight at h6. White pawn at d5 and white pawn at h5. Black pawn at b4, black pawn at e4 and black pawn at g4. White pawn at e3 and white pawn at h3. White pawn at a2, white pawn at b2, white pawn at d2, white king at e2 and white pawn at f2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 18. White to move.