rnb1k3/p3np1r/2q1p2b/1pNp2p1/1PpPPP1p/P1K5/2PQB1PP/RNB1R3 b q - 4 18
FEN state: rnb1k3/p3np1r/2q1p2b/1pNp2p1/1PpPPP1p/P1K5/2PQB1PP/RNB1R3 b q - 4 18 ; Best move: d5e4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8 and black king at e8. Black pawn at a7, black knight at e7, black pawn at f7 and black rook at h7. Black queen at c6, black pawn at e6 and black bishop at h6. Black pawn at b5, white knight at c5, black pawn at d5 and black pawn at g5. White pawn at b4, black pawn at c4, white pawn at d4, white pawn at e4, white pawn at f4 and black pawn at h4. White pawn at a3 and white king at c3. White pawn at c2, white queen at d2, white bishop at e2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1 and white rook at e1. Black queenside is the only castle move available. Half move number is 4. Full move number is 18. Black to move.