r1bqkbr1/pppppp2/5np1/5P2/1PP5/B2PKnpB/P1Q1P2P/RN4NR b q - 5 13
FEN state: r1bqkbr1/pppppp2/5np1/5P2/1PP5/B2PKnpB/P1Q1P2P/RN4NR b q - 5 13 ; Best move: f3e1
The current state of the chess board is: Black rook at a8, black bishop at c8, 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 d7, black pawn at e7 and black pawn at f7. Black knight at f6 and black pawn at g6. White pawn at f5. White pawn at b4 and white pawn at c4. White bishop at a3, white pawn at d3, white king at e3, black knight at f3, black pawn at g3 and white bishop at h3. White pawn at a2, white queen at c2, white pawn at e2 and white pawn at h2. White rook at a1, white knight at b1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 5. Full move number is 13. Black to move.