rn1qkbr1/ppp1p2p/2b2n2/6p1/P1PpPp1P/NQ1P4/1P2NPP1/R1BK1B1R b q - 0 13
FEN state: rn1qkbr1/ppp1p2p/2b2n2/6p1/P1PpPp1P/NQ1P4/1P2NPP1/R1BK1B1R b q - 0 13 ; Best move: b8a6
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at e7 and black pawn at h7. Black bishop at c6 and black knight at f6. Black pawn at g5. White pawn at a4, white pawn at c4, black pawn at d4, white pawn at e4, black pawn at f4 and white pawn at h4. White knight at a3, white queen at b3 and white pawn at d3. White pawn at b2, white knight at e2, white pawn at f2 and white pawn at g2. White rook at a1, white bishop at c1, white king at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 13. Black to move.