r1b1kbn1/2qp3r/p4p1p/npP3PR/Pp2pP2/1QN3P1/3PPK2/R1B2BN1 b q - 0 23
FEN state: r1b1kbn1/2qp3r/p4p1p/npP3PR/Pp2pP2/1QN3P1/3PPK2/R1B2BN1 b q - 0 23 ; Best move: a5b3
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black knight at g8. Black queen at c7, black pawn at d7 and black rook at h7. Black pawn at a6, black pawn at f6 and black pawn at h6. Black knight at a5, black pawn at b5, white pawn at c5, white pawn at g5 and white rook at h5. White pawn at a4, black pawn at b4, black pawn at e4 and white pawn at f4. White queen at b3, white knight at c3 and white pawn at g3. White pawn at d2, white pawn at e2 and white king at f2. White rook at a1, white bishop at c1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 23. Black to move.