r1b2bnr/2p1p1pp/np2kp2/8/p1p1P2P/NQ1q2P1/PP1P1P2/R1B1KBNR b K - 0 13
FEN state: r1b2bnr/2p1p1pp/np2kp2/8/p1p1P2P/NQ1q2P1/PP1P1P2/R1B1KBNR b K - 0 13 ; Best move: a4b3
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at c7, black pawn at e7, black pawn at g7 and black pawn at h7. Black knight at a6, black pawn at b6, black king at e6 and black pawn at f6. Black pawn at a4, black pawn at c4, white pawn at e4 and white pawn at h4. White knight at a3, white queen at b3, black queen at d3 and white pawn at g3. White pawn at a2, white pawn at b2, white pawn at d2 and white pawn at f2. White rook at a1, white bishop at c1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 13. Black to move.