r1bqkbn1/1p1p1p2/p1r1p3/R1p3pP/1n2P3/B2P3B/2P2P1P/1N1QK1NR w Kq - 0 13
FEN state: r1bqkbn1/1p1p1p2/p1r1p3/R1p3pP/1n2P3/B2P3B/2P2P1P/1N1QK1NR w Kq - 0 13 ; Best move: a3b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at b7, black pawn at d7 and black pawn at f7. Black pawn at a6, black rook at c6 and black pawn at e6. White rook at a5, black pawn at c5, black pawn at g5 and white pawn at h5. Black knight at b4 and white pawn at e4. White bishop at a3, white pawn at d3 and white bishop at h3. White pawn at c2, white pawn at f2 and white pawn at h2. White knight at b1, white queen at d1, white king at e1, white knight at g1 and white rook at h1. White kingside and black queenside castles are available. Half move number is 0. Full move number is 13. White to move.