rnb1k2r/3p2p1/pNp1pp1n/1p4qp/1b2P3/P1PP1PPP/4Q3/R1B1KBNR w KQkq - 1 13
FEN state: rnb1k2r/3p2p1/pNp1pp1n/1p4qp/1b2P3/P1PP1PPP/4Q3/R1B1KBNR w KQkq - 1 13 ; Best move: a3b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at d7 and black pawn at g7. Black pawn at a6, white knight at b6, black pawn at c6, black pawn at e6, black pawn at f6 and black knight at h6. Black pawn at b5, black queen at g5 and black pawn at h5. Black bishop at b4 and white pawn at e4. White pawn at a3, white pawn at c3, white pawn at d3, white pawn at f3, white pawn at g3 and white pawn at h3. White queen at e2. White rook at a1, white bishop at c1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside, white queenside, black kingside and black queenside castles are available. Half move number is 1. Full move number is 13. White to move.