r1b1kr2/2pp1pqp/pp2p2b/1P4p1/5PP1/N1PP4/P1nKP2P/R3QBNR b q - 4 13
FEN state: r1b1kr2/2pp1pqp/pp2p2b/1P4p1/5PP1/N1PP4/P1nKP2P/R3QBNR b q - 4 13 ; Best move: c2e1
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at f8. Black pawn at c7, black pawn at d7, black pawn at f7, black queen at g7 and black pawn at h7. Black pawn at a6, black pawn at b6, black pawn at e6 and black bishop at h6. White pawn at b5 and black pawn at g5. White pawn at f4 and white pawn at g4. White knight at a3, white pawn at c3 and white pawn at d3. White pawn at a2, black knight at c2, white king at d2, white pawn at e2 and white pawn at h2. White rook at a1, white queen at e1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 13. Black to move.