r1q2knr/1pN2p1p/2n5/p2pp1p1/P2P4/bP5P/1BP2PP1/1RQ1KBNR b K - 4 13
FEN state: r1q2knr/1pN2p1p/2n5/p2pp1p1/P2P4/bP5P/1BP2PP1/1RQ1KBNR b K - 4 13 ; Best move: a3b2
The current state of the chess board is: Black rook at a8, black queen at c8, black king at f8, black knight at g8 and black rook at h8. Black pawn at b7, white knight at c7, black pawn at f7 and black pawn at h7. Black knight at c6. Black pawn at a5, black pawn at d5, black pawn at e5 and black pawn at g5. White pawn at a4 and white pawn at d4. Black bishop at a3, white pawn at b3 and white pawn at h3. White bishop at b2, white pawn at c2, white pawn at f2 and white pawn at g2. White rook at b1, white queen 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 4. Full move number is 13. Black to move.