r1b1kb1r/3n1n2/q2p2p1/1Pp2P1p/p2P4/N3PN1P/1PPQ2PR/R1B1K3 w Q - 0 18
FEN state: r1b1kb1r/3n1n2/q2p2p1/1Pp2P1p/p2P4/N3PN1P/1PPQ2PR/R1B1K3 w Q - 0 18 ; Best move: b5a6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black knight at d7 and black knight at f7. Black queen at a6, black pawn at d6 and black pawn at g6. White pawn at b5, black pawn at c5, white pawn at f5 and black pawn at h5. Black pawn at a4 and white pawn at d4. White knight at a3, white pawn at e3, white knight at f3 and white pawn at h3. White pawn at b2, white pawn at c2, white queen at d2, white pawn at g2 and white rook at h2. White rook at a1, white bishop at c1 and white king at e1. White queenside is the only castle move available. Half move number is 0. Full move number is 18. White to move.