r1bqkb2/3p1pr1/1pp4p/pP2p1p1/PnPP2PP/4KP2/NR2P3/2BQ1BNn w q - 4 19
FEN state: r1bqkb2/3p1pr1/1pp4p/pP2p1p1/PnPP2PP/4KP2/NR2P3/2BQ1BNn w q - 4 19 ; Best move: a2b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at d7, black pawn at f7 and black rook at g7. Black pawn at b6, black pawn at c6 and black pawn at h6. Black pawn at a5, white pawn at b5, black pawn at e5 and black pawn at g5. White pawn at a4, black knight at b4, white pawn at c4, white pawn at d4, white pawn at g4 and white pawn at h4. White king at e3 and white pawn at f3. White knight at a2, white rook at b2 and white pawn at e2. White bishop at c1, white queen at d1, white bishop at f1, white knight at g1 and black knight at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 19. White to move.