rnbbk3/3pn3/1q2pppr/ppp4p/P3PP1P/1P1B2Q1/RBPPK1P1/1N4NR w q - 10 15
FEN state: rnbbk3/3pn3/1q2pppr/ppp4p/P3PP1P/1P1B2Q1/RBPPK1P1/1N4NR w q - 10 15 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black bishop at d8 and black king at e8. Black pawn at d7 and black knight at e7. Black queen at b6, black pawn at e6, black pawn at f6, black pawn at g6 and black rook at h6. Black pawn at a5, black pawn at b5, black pawn at c5 and black pawn at h5. White pawn at a4, white pawn at e4, white pawn at f4 and white pawn at h4. White pawn at b3, white bishop at d3 and white queen at g3. White rook at a2, white bishop at b2, white pawn at c2, white pawn at d2, white king at e2 and white pawn at g2. White knight at b1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 10. Full move number is 15. White to move.