1rb1k2r/1pp3p1/p3pp1n/2PpP1b1/N5Bp/P6P/RP1PQKP1/2B3NR b k - 1 20
FEN state: 1rb1k2r/1pp3p1/p3pp1n/2PpP1b1/N5Bp/P6P/RP1PQKP1/2B3NR b k - 1 20 ; Best move: g5f4
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at b7, black pawn at c7 and black pawn at g7. Black pawn at a6, black pawn at e6, black pawn at f6 and black knight at h6. White pawn at c5, black pawn at d5, white pawn at e5 and black bishop at g5. White knight at a4, white bishop at g4 and black pawn at h4. White pawn at a3 and white pawn at h3. White rook at a2, white pawn at b2, white pawn at d2, white queen at e2, white king at f2 and white pawn at g2. White bishop at c1, white knight at g1 and white rook at h1. Black kingside is the only castle move available. Half move number is 1. Full move number is 20. Black to move.