rn3b1r/ppp1qp1p/3kbp2/3p4/P2Q2P1/1R1PPP2/1PP4P/1N2KBNR w - - 13 18
FEN state: rn3b1r/ppp1qp1p/3kbp2/3p4/P2Q2P1/1R1PPP2/1PP4P/1N2KBNR w - - 13 18 ; Best move: d4b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black queen at e7, black pawn at f7 and black pawn at h7. Black king at d6, black bishop at e6 and black pawn at f6. Black pawn at d5. White pawn at a4, white queen at d4 and white pawn at g4. White rook at b3, white pawn at d3, white pawn at e3 and white pawn at f3. White pawn at b2, white pawn at c2 and white pawn at h2. White knight at b1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 13. Full move number is 18. White to move.