rnbqkbr1/1ppp2p1/p3p3/5p1p/P2Pn2P/1PP3PB/2Q1PP2/RNBK2NR b q - 4 10
FEN state: rnbqkbr1/1ppp2p1/p3p3/5p1p/P2Pn2P/1PP3PB/2Q1PP2/RNBK2NR b q - 4 10 ; Best move: e4f2
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at b7, black pawn at c7, black pawn at d7 and black pawn at g7. Black pawn at a6 and black pawn at e6. Black pawn at f5 and black pawn at h5. White pawn at a4, white pawn at d4, black knight at e4 and white pawn at h4. White pawn at b3, white pawn at c3, white pawn at g3 and white bishop at h3. White queen at c2, white pawn at e2 and white pawn at f2. 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.