r2q1k1r/ppp2p1p/3Ppn2/nP1p2p1/b1RP3P/N5P1/P2BPP2/3QKBNR b K - 4 13
FEN state: r2q1k1r/ppp2p1p/3Ppn2/nP1p2p1/b1RP3P/N5P1/P2BPP2/3QKBNR b K - 4 13 ; Best move: a4d1
The current state of the chess board is: Black rook at a8, black queen at d8, black king at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at f7 and black pawn at h7. White pawn at d6, black pawn at e6 and black knight at f6. Black knight at a5, white pawn at b5, black pawn at d5 and black pawn at g5. Black bishop at a4, white rook at c4, white pawn at d4 and white pawn at h4. White knight at a3 and white pawn at g3. White pawn at a2, white bishop at d2, white pawn at e2 and white pawn at f2. White queen at d1, 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.