r1n1kbn1/ppp1ppp1/7r/P2qBb1p/2Pp3P/RP1P2P1/4PP1R/1N1QKBN1 w q - 1 15
FEN state: r1n1kbn1/ppp1ppp1/7r/P2qBb1p/2Pp3P/RP1P2P1/4PP1R/1N1QKBN1 w q - 1 15 ; Best move: c4d5
The current state of the chess board is: Black rook at a8, black knight at c8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at e7, black pawn at f7 and black pawn at g7. Black rook at h6. White pawn at a5, black queen at d5, white bishop at e5, black bishop at f5 and black pawn at h5. White pawn at c4, black pawn at d4 and white pawn at h4. White rook at a3, white pawn at b3, white pawn at d3 and white pawn at g3. White pawn at e2, white pawn at f2 and white rook at h2. White knight at b1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 1. Full move number is 15. White to move.