r2qkb1r/1b1ppp2/n7/ppp1n1p1/8/PP1BPNP1/1BPP1P1P/RN2QK1R b k - 4 13
FEN state: r2qkb1r/1b1ppp2/n7/ppp1n1p1/8/PP1BPNP1/1BPP1P1P/RN2QK1R b k - 4 13 ; Best move: e5f3
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black bishop at b7, black pawn at d7, black pawn at e7 and black pawn at f7. Black knight at a6. Black pawn at a5, black pawn at b5, black pawn at c5, black knight at e5 and black pawn at g5. White pawn at a3, white pawn at b3, white bishop at d3, white pawn at e3, white knight at f3 and white pawn at g3. White bishop at b2, white pawn at c2, white pawn at d2, white pawn at f2 and white pawn at h2. White rook at a1, white knight at b1, white queen at e1, white king at f1 and white rook at h1. Black kingside is the only castle move available. Half move number is 4. Full move number is 13. Black to move.