rq2kb2/pb2pp2/5rBn/1ppp4/1n1N1p1p/NPB1P1P1/PRPPK2P/3Q2R1 w q - 2 21
FEN state: rq2kb2/pb2pp2/5rBn/1ppp4/1n1N1p1p/NPB1P1P1/PRPPK2P/3Q2R1 w q - 2 21 ; Best move: g3f4
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8 and black bishop at f8. Black pawn at a7, black bishop at b7, black pawn at e7 and black pawn at f7. Black rook at f6, white bishop at g6 and black knight at h6. Black pawn at b5, black pawn at c5 and black pawn at d5. Black knight at b4, white knight at d4, black pawn at f4 and black pawn at h4. White knight at a3, white pawn at b3, white bishop at c3, white pawn at e3 and white pawn at g3. White pawn at a2, white rook at b2, white pawn at c2, white pawn at d2, white king at e2 and white pawn at h2. White queen at d1 and white rook at g1. Black queenside is the only castle move available. Half move number is 2. Full move number is 21. White to move.