r1b1k1nr/1n2p3/ppp1N2b/3B2pp/2P3p1/1PNPP3/P4q2/R1BQKR2 w Q - 0 18
FEN state: r1b1k1nr/1n2p3/ppp1N2b/3B2pp/2P3p1/1PNPP3/P4q2/R1BQKR2 w Q - 0 18 ; Best move: e1f2
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 knight at b7 and black pawn at e7. Black pawn at a6, black pawn at b6, black pawn at c6, white knight at e6 and black bishop at h6. White bishop at d5, black pawn at g5 and black pawn at h5. White pawn at c4 and black pawn at g4. White pawn at b3, white knight at c3, white pawn at d3 and white pawn at e3. White pawn at a2 and black queen at f2. White rook at a1, white bishop at c1, white queen at d1, white king at e1 and white rook at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 18. White to move.