r1b3nr/q2p1kbp/1pp5/4p1p1/3P1p2/QPn3P1/1NP1PPBP/1RBK2NR w - - 4 18
FEN state: r1b3nr/q2p1kbp/1pp5/4p1p1/3P1p2/QPn3P1/1NP1PPBP/1RBK2NR w - - 4 18 ; Best move: d1e1
The current state of the chess board is: Black rook at a8, black bishop at c8, black knight at g8 and black rook at h8. Black queen at a7, black pawn at d7, black king at f7, black bishop at g7 and black pawn at h7. Black pawn at b6 and black pawn at c6. Black pawn at e5 and black pawn at g5. White pawn at d4 and black pawn at f4. White queen at a3, white pawn at b3, black knight at c3 and white pawn at g3. White knight at b2, white pawn at c2, white pawn at e2, white pawn at f2, white bishop at g2 and white pawn at h2. White rook at b1, white bishop at c1, white king at d1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 18. White to move.