r1b1k1r1/p1pp1pp1/1pn1p2Q/5n2/1q2B2b/N1P1PP2/PP1P1NPP/1RB2K1R b q - 4 20
FEN state: r1b1k1r1/p1pp1pp1/1pn1p2Q/5n2/1q2B2b/N1P1PP2/PP1P1NPP/1RB2K1R b q - 4 20 ; Best move: b4e4
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, black pawn at c7, black pawn at d7, black pawn at f7 and black pawn at g7. Black pawn at b6, black knight at c6, black pawn at e6 and white queen at h6. Black knight at f5. Black queen at b4, white bishop at e4 and black bishop at h4. White knight at a3, white pawn at c3, white pawn at e3 and white pawn at f3. White pawn at a2, white pawn at b2, white pawn at d2, white knight at f2, white pawn at g2 and white pawn at h2. White rook at b1, white bishop at c1, white king at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 20. Black to move.