rnb1k1n1/pp1p2p1/7r/q1bP1p1p/2P2P2/2N1p2P/PB2P1P1/R1K1QBNR w q - 4 18
FEN state: rnb1k1n1/pp1p2p1/7r/q1bP1p1p/2P2P2/2N1p2P/PB2P1P1/R1K1QBNR w q - 4 18 ; Best move: g1f3
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black knight at g8. Black pawn at a7, black pawn at b7, black pawn at d7 and black pawn at g7. Black rook at h6. Black queen at a5, black bishop at c5, white pawn at d5, black pawn at f5 and black pawn at h5. White pawn at c4 and white pawn at f4. White knight at c3, black pawn at e3 and white pawn at h3. White pawn at a2, white bishop at b2, white pawn at e2 and white pawn at g2. White rook at a1, white king at c1, white queen at e1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 18. White to move.