r1bqk3/p5pr/2npP2n/1pp4p/P1P1P3/1Pb2P1P/1B1P2B1/RN1Q1KNR w q - 0 18
FEN state: r1bqk3/p5pr/2npP2n/1pp4p/P1P1P3/1Pb2P1P/1B1P2B1/RN1Q1KNR w q - 0 18 ; Best move: b1c3
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8 and black king at e8. Black pawn at a7, black pawn at g7 and black rook at h7. Black knight at c6, black pawn at d6, white pawn at e6 and black knight at h6. Black pawn at b5, black pawn at c5 and black pawn at h5. White pawn at a4, white pawn at c4 and white pawn at e4. White pawn at b3, black bishop at c3, white pawn at f3 and white pawn at h3. White bishop at b2, white pawn at d2 and white bishop at g2. White rook at a1, white knight at b1, white queen at d1, white king at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 18. White to move.