r3k3/p1p1np2/np2pq1r/2b1pPp1/2P3RN/1P1P3P/P4P2/RNBK1B2 b q - 4 20
FEN state: r3k3/p1p1np2/np2pq1r/2b1pPp1/2P3RN/1P1P3P/P4P2/RNBK1B2 b q - 4 20 ; Best move: e5e4
The current state of the chess board is: Black rook at a8 and black king at e8. Black pawn at a7, black pawn at c7, black knight at e7 and black pawn at f7. Black knight at a6, black pawn at b6, black pawn at e6, black queen at f6 and black rook at h6. Black bishop at c5, black pawn at e5, white pawn at f5 and black pawn at g5. White pawn at c4, white rook at g4 and white knight at h4. White pawn at b3, white pawn at d3 and white pawn at h3. White pawn at a2 and white pawn at f2. White rook at a1, white knight at b1, white bishop at c1, white king at d1 and white bishop at f1. Black queenside is the only castle move available. Half move number is 4. Full move number is 20. Black to move.