rnb1k2r/pp1pb1p1/3qpp2/3B4/2pBKPP1/P1PP3p/1P5P/RN3QNR w kq - 2 21
FEN state: rnb1k2r/pp1pb1p1/3qpp2/3B4/2pBKPP1/P1PP3p/1P5P/RN3QNR w kq - 2 21 ; Best move: d3c4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at d7, black bishop at e7 and black pawn at g7. Black queen at d6, black pawn at e6 and black pawn at f6. White bishop at d5. Black pawn at c4, white bishop at d4, white king at e4, white pawn at f4 and white pawn at g4. White pawn at a3, white pawn at c3, white pawn at d3 and black pawn at h3. White pawn at b2 and white pawn at h2. White rook at a1, white knight at b1, white queen at f1, white knight at g1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 2. Full move number is 21. White to move.