r1b2qnr/p1pk2pp/2nb1p2/1p1p1P2/QP1Pp3/P1P1B1P1/3NPK1P/R4BNR w - - 5 13
FEN state: r1b2qnr/p1pk2pp/2nb1p2/1p1p1P2/QP1Pp3/P1P1B1P1/3NPK1P/R4BNR w - - 5 13 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at f8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at c7, black king at d7, black pawn at g7 and black pawn at h7. Black knight at c6, black bishop at d6 and black pawn at f6. Black pawn at b5, black pawn at d5 and white pawn at f5. White queen at a4, white pawn at b4, white pawn at d4 and black pawn at e4. White pawn at a3, white pawn at c3, white bishop at e3 and white pawn at g3. White knight at d2, white pawn at e2, white king at f2 and white pawn at h2. White rook at a1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 5. Full move number is 13. White to move.