r2q1kr1/2pbppbp/2n3p1/pp1p4/P1P1n3/3Q2PP/1P1PPPB1/R1BNK2R w Q - 1 15
FEN state: r2q1kr1/2pbppbp/2n3p1/pp1p4/P1P1n3/3Q2PP/1P1PPPB1/R1BNK2R w Q - 1 15 ; Best move: c4d5
The current state of the chess board is: Black rook at a8, black queen at d8, black king at f8 and black rook at g8. Black pawn at c7, black bishop at d7, black pawn at e7, black pawn at f7, black bishop at g7 and black pawn at h7. Black knight at c6 and black pawn at g6. Black pawn at a5, black pawn at b5 and black pawn at d5. White pawn at a4, white pawn at c4 and black knight at e4. White queen at d3, white pawn at g3 and white pawn at h3. White pawn at b2, white pawn at d2, white pawn at e2, white pawn at f2 and white bishop at g2. White rook at a1, white bishop at c1, white knight at d1, white king at e1 and white rook at h1. White queenside is the only castle move available. Half move number is 1. Full move number is 15. White to move.