rnb1kb2/p2pp3/1qp4r/1p1n2p1/PPPPP2p/1QR3pP/3BBPK1/1N4NR b q - 0 20
FEN state: rnb1kb2/p2pp3/1qp4r/1p1n2p1/PPPPP2p/1QR3pP/3BBPK1/1N4NR b q - 0 20 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at d7 and black pawn at e7. Black queen at b6, black pawn at c6 and black rook at h6. Black pawn at b5, black knight at d5 and black pawn at g5. White pawn at a4, white pawn at b4, white pawn at c4, white pawn at d4, white pawn at e4 and black pawn at h4. White queen at b3, white rook at c3, black pawn at g3 and white pawn at h3. White bishop at d2, white bishop at e2, white pawn at f2 and white king at g2. White knight at b1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. Black to move.