r3k1nr/2pq1p1p/ppNp1b2/R3pbpP/1P4R1/1PPPP3/2Q1BPP1/1NB2K2 w kq - 0 20
FEN state: r3k1nr/2pq1p1p/ppNp1b2/R3pbpP/1P4R1/1PPPP3/2Q1BPP1/1NB2K2 w kq - 0 20 ; Best move: a5a6
The current state of the chess board is: Black rook at a8, black king at e8, black knight at g8 and black rook at h8. Black pawn at c7, black queen at d7, black pawn at f7 and black pawn at h7. Black pawn at a6, black pawn at b6, white knight at c6, black pawn at d6 and black bishop at f6. White rook at a5, black pawn at e5, black bishop at f5, black pawn at g5 and white pawn at h5. White pawn at b4 and white rook at g4. White pawn at b3, white pawn at c3, white pawn at d3 and white pawn at e3. White queen at c2, white bishop at e2, white pawn at f2 and white pawn at g2. White knight at b1, white bishop at c1 and white king at f1. Black kingside and black queenside castles are available. Half move number is 0. Full move number is 20. White to move.