rn1q1rk1/p2ppp1p/bpp5/1Pb2np1/2P3PP/B7/P1NPPPR1/R2QKB2 w Q - 0 15
FEN state: rn1q1rk1/p2ppp1p/bpp5/1Pb2np1/2P3PP/B7/P1NPPPR1/R2QKB2 w Q - 0 15 ; Best move: g4f5
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black rook at f8 and black king at g8. Black pawn at a7, black pawn at d7, black pawn at e7, black pawn at f7 and black pawn at h7. Black bishop at a6, black pawn at b6 and black pawn at c6. White pawn at b5, black bishop at c5, black knight at f5 and black pawn at g5. White pawn at c4, white pawn at g4 and white pawn at h4. White bishop at a3. White pawn at a2, white knight at c2, white pawn at d2, white pawn at e2, white pawn at f2 and white rook at g2. White rook at a1, white queen at d1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 15. White to move.