1r3bnr/p3pp1p/b2pkBP1/1p1q3P/1pP4N/N2P4/n1Q1PP2/R3KBR1 w Q - 2 21
FEN state: 1r3bnr/p3pp1p/b2pkBP1/1p1q3P/1pP4N/N2P4/n1Q1PP2/R3KBR1 w Q - 2 21 ; Best move: f6h8
The current state of the chess board is: Black rook at b8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at e7, black pawn at f7 and black pawn at h7. Black bishop at a6, black pawn at d6, black king at e6, white bishop at f6 and white pawn at g6. Black pawn at b5, black queen at d5 and white pawn at h5. Black pawn at b4, white pawn at c4 and white knight at h4. White knight at a3 and white pawn at d3. Black knight at a2, white queen at c2, white pawn at e2 and white pawn at f2. White rook at a1, white king at e1, white bishop at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 2. Full move number is 21. White to move.