rn3k1r/p6p/bpp2p1b/1P4N1/Pq1pPn2/2RQ2P1/3P1PBP/1N2K2R w K - 0 21
FEN state: rn3k1r/p6p/bpp2p1b/1P4N1/Pq1pPn2/2RQ2P1/3P1PBP/1N2K2R w K - 0 21 ; Best move: g3f4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at f8 and black rook at h8. Black pawn at a7 and black pawn at h7. Black bishop at a6, black pawn at b6, black pawn at c6, black pawn at f6 and black bishop at h6. White pawn at b5 and white knight at g5. White pawn at a4, black queen at b4, black pawn at d4, white pawn at e4 and black knight at f4. White rook at c3, white queen at d3 and white pawn at g3. White pawn at d2, white pawn at f2, white bishop at g2 and white pawn at h2. White knight at b1, white king at e1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 21. White to move.