r1b1kbr1/3nqp2/p1p2np1/1Q1Pp2p/1p4P1/P1PK1P1P/1P1P4/RNB2BNR b q - 1 13
FEN state: r1b1kbr1/3nqp2/p1p2np1/1Q1Pp2p/1p4P1/P1PK1P1P/1P1P4/RNB2BNR b q - 1 13 ; Best move: a6b5
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 rook at g8. Black knight at d7, black queen at e7 and black pawn at f7. Black pawn at a6, black pawn at c6, black knight at f6 and black pawn at g6. White queen at b5, white pawn at d5, black pawn at e5 and black pawn at h5. Black pawn at b4 and white pawn at g4. White pawn at a3, white pawn at c3, white king at d3, white pawn at f3 and white pawn at h3. White pawn at b2 and white pawn at d2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 13. Black to move.