r1bq1b1r/p1ppk1p1/1pn2p2/4pn1p/2P1P2P/P2P4/RP2NPP1/1NBQKB1R b K - 2 10
FEN state: r1bq1b1r/p1ppk1p1/1pn2p2/4pn1p/2P1P2P/P2P4/RP2NPP1/1NBQKB1R b K - 2 10 ; Best move: f5d4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at c7, black pawn at d7, black king at e7 and black pawn at g7. Black pawn at b6, black knight at c6 and black pawn at f6. Black pawn at e5, black knight at f5 and black pawn at h5. White pawn at c4, white pawn at e4 and white pawn at h4. White pawn at a3 and white pawn at d3. White rook at a2, white pawn at b2, white knight at e2, white pawn at f2 and white pawn at g2. White knight at b1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white rook at h1. White kingside is the only castle move available. Half move number is 2. Full move number is 10. Black to move.