r3k1nr/p1np1pp1/1p6/1bP3Pp/PPp1p2P/2P1BPbN/RQ1KPR2/1N3B2 b q - 0 23
FEN state: r3k1nr/p1np1pp1/1p6/1bP3Pp/PPp1p2P/2P1BPbN/RQ1KPR2/1N3B2 b q - 0 23 ; Best move: b5c6
The current state of the chess board is: Black rook at a8, black king at e8, black knight at g8 and black rook at h8. Black pawn at a7, black knight at c7, black pawn at d7, black pawn at f7 and black pawn at g7. Black pawn at b6. Black bishop at b5, white pawn at c5, white pawn at g5 and black pawn at h5. White pawn at a4, white pawn at b4, black pawn at c4, black pawn at e4 and white pawn at h4. White pawn at c3, white bishop at e3, white pawn at f3, black bishop at g3 and white knight at h3. White rook at a2, white queen at b2, white king at d2, white pawn at e2 and white rook at f2. White knight at b1 and white bishop at f1. Black queenside is the only castle move available. Half move number is 0. Full move number is 23. Black to move.