r1b1kbnr/2pp1pp1/p3p3/1p1Pn1qp/1P2P3/6PB/P1PQ1P1P/RNBK2NR b q - 4 10
FEN state: r1b1kbnr/2pp1pp1/p3p3/1p1Pn1qp/1P2P3/6PB/P1PQ1P1P/RNBK2NR b q - 4 10 ; Best move: g5d2
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at c7, black pawn at d7, black pawn at f7 and black pawn at g7. Black pawn at a6 and black pawn at e6. Black pawn at b5, white pawn at d5, black knight at e5, black queen at g5 and black pawn at h5. White pawn at b4 and white pawn at e4. White pawn at g3 and white bishop at h3. White pawn at a2, white pawn at c2, white queen at d2, white pawn at f2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white king at d1, 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 10. Black to move.