r1bqkb2/pp1pp1pn/2p5/P4p2/2PP2Qr/N3P1Pp/RP4BP/2B1K1NR w q - 1 18
FEN state: r1bqkb2/pp1pp1pn/2p5/P4p2/2PP2Qr/N3P1Pp/RP4BP/2B1K1NR w q - 1 18 ; Best move: g4g6
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at b7, black pawn at d7, black pawn at e7, black pawn at g7 and black knight at h7. Black pawn at c6. White pawn at a5 and black pawn at f5. White pawn at c4, white pawn at d4, white queen at g4 and black rook at h4. White knight at a3, white pawn at e3, white pawn at g3 and black pawn at h3. White rook at a2, white pawn at b2, white bishop at g2 and white pawn at h2. White bishop at c1, white king at e1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 18. White to move.