r1b1kb2/3nppp1/1p5P/pq1p3p/1PpPNP2/4Q2P/P1P1K3/1RB2BNR b q - 0 18
FEN state: r1b1kb2/3nppp1/1p5P/pq1p3p/1PpPNP2/4Q2P/P1P1K3/1RB2BNR b q - 0 18 ; Best move: d5e4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black bishop at f8. Black knight at d7, black pawn at e7, black pawn at f7 and black pawn at g7. Black pawn at b6 and white pawn at h6. Black pawn at a5, black queen at b5, black pawn at d5 and black pawn at h5. White pawn at b4, black pawn at c4, white pawn at d4, white knight at e4 and white pawn at f4. White queen at e3 and white pawn at h3. White pawn at a2, white pawn at c2 and white king at e2. White rook at b1, white bishop at c1, 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 0. Full move number is 18. Black to move.