r1b1k1nr/2p1pp2/np3Bp1/P2P4/3b3P/2pBP3/q2N1PPR/R2K2N1 w - - 0 18
FEN state: r1b1k1nr/2p1pp2/np3Bp1/P2P4/3b3P/2pBP3/q2N1PPR/R2K2N1 w - - 0 18 ; Best move: a1a2
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black knight at g8 and black rook at h8. Black pawn at c7, black pawn at e7 and black pawn at f7. Black knight at a6, black pawn at b6, white bishop at f6 and black pawn at g6. White pawn at a5 and white pawn at d5. Black bishop at d4 and white pawn at h4. Black pawn at c3, white bishop at d3 and white pawn at e3. Black queen at a2, white knight at d2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white king at d1 and white knight at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 18. White to move.