r2qk2r/p2np2p/n3P2b/1ppp1pp1/P2P1P1P/RbN5/4Q3/1NB1KBR1 b q - 1 20
FEN state: r2qk2r/p2np2p/n3P2b/1ppp1pp1/P2P1P1P/RbN5/4Q3/1NB1KBR1 b q - 1 20 ; Best move: g5g4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8 and black rook at h8. Black pawn at a7, black knight at d7, black pawn at e7 and black pawn at h7. Black knight at a6, white pawn at e6 and black bishop at h6. Black pawn at b5, black pawn at c5, black pawn at d5, black pawn at f5 and black pawn at g5. White pawn at a4, white pawn at d4, white pawn at f4 and white pawn at h4. White rook at a3, black bishop at b3 and white knight at c3. White queen at e2. White knight at b1, white bishop at c1, white king at e1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 1. Full move number is 20. Black to move.