r1bq1bnr/2ppk3/2n2pp1/pp2p2p/P3P1P1/2NB1P1P/RPPP4/2BQK1NR b K - 0 10
FEN state: r1bq1bnr/2ppk3/2n2pp1/pp2p2p/P3P1P1/2NB1P1P/RPPP4/2BQK1NR b K - 0 10 ; Best move: b5b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at c7, black pawn at d7 and black king at e7. Black knight at c6, black pawn at f6 and black pawn at g6. Black pawn at a5, black pawn at b5, black pawn at e5 and black pawn at h5. White pawn at a4, white pawn at e4 and white pawn at g4. White knight at c3, white bishop at d3, white pawn at f3 and white pawn at h3. White rook at a2, white pawn at b2, white pawn at c2 and white pawn at d2. White bishop at c1, white queen at d1, white king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 10. Black to move.