r3k1r1/p2p1ppp/b1n5/2pP1p1B/PpP3Pq/N3P1b1/1P2K2P/1RB3NR b q - 2 20
FEN state: r3k1r1/p2p1ppp/b1n5/2pP1p1B/PpP3Pq/N3P1b1/1P2K2P/1RB3NR b q - 2 20 ; Best move: b4a3
The current state of the chess board is: Black rook at a8, black king at e8 and black rook at g8. Black pawn at a7, black pawn at d7, black pawn at f7, black pawn at g7 and black pawn at h7. Black bishop at a6 and black knight at c6. Black pawn at c5, white pawn at d5, black pawn at f5 and white bishop at h5. White pawn at a4, black pawn at b4, white pawn at c4, white pawn at g4 and black queen at h4. White knight at a3, white pawn at e3 and black bishop at g3. White pawn at b2, white king at e2 and white pawn at h2. White rook at b1, white bishop at c1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 20. Black to move.