rn2k1nr/3bb3/p1pp3p/Pp3pp1/1P3NN1/BR6/2PP1PPP/4KB1R b K - 0 21
FEN state: rn2k1nr/3bb3/p1pp3p/Pp3pp1/1P3NN1/BR6/2PP1PPP/4KB1R b K - 0 21 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black knight at g8 and black rook at h8. Black bishop at d7 and black bishop at e7. Black pawn at a6, black pawn at c6, black pawn at d6 and black pawn at h6. White pawn at a5, black pawn at b5, black pawn at f5 and black pawn at g5. White pawn at b4, white knight at f4 and white knight at g4. White bishop at a3 and white rook at b3. White pawn at c2, white pawn at d2, white pawn at f2, white pawn at g2 and white pawn at h2. 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 0. Full move number is 21. Black to move.