1nb1kr2/r2p3p/pq1b2pn/PppBp3/1P2Pp1P/2P2PR1/3PK1P1/RNBQN3 w - - 2 18
FEN state: 1nb1kr2/r2p3p/pq1b2pn/PppBp3/1P2Pp1P/2P2PR1/3PK1P1/RNBQN3 w - - 2 18 ; Best move: a5b6
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8 and black rook at f8. Black rook at a7, black pawn at d7 and black pawn at h7. Black pawn at a6, black queen at b6, black bishop at d6, black pawn at g6 and black knight at h6. White pawn at a5, black pawn at b5, black pawn at c5, white bishop at d5 and black pawn at e5. White pawn at b4, white pawn at e4, black pawn at f4 and white pawn at h4. White pawn at c3, white pawn at f3 and white rook at g3. White pawn at d2, white king at e2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1 and white knight at e1. Both players have exhausted their castles. Half move number is 2. Full move number is 18. White to move.