Found a very interesting theory:
"Rowling always had a good sense of humour ;-). She described the Second Wizard War in the McGonagall's chess game. The chessmen (chessmen, figures...how strangely she describes them, like real people, not like pieces of stone) are black (Aurors) and white (Death Eaters). The white figures are scary, cus they are "faceless" (white terrible masks of Death Eaters)
"Harry, Ron and Hermione shivered slightly -- the towering white chessmen had no faces."
Then let's take a look at this:
"Well, Harry, you take the place of that bishop, and Hermione, you are next to him instead of that castle."
"What about you?"
"I'm going to be a knight," said Ron."
That's a very strange choice, isn't it? Ron is very good at chess, he must knew, that it's better to be a king, because kings can stay until the end of the game without being taken, and they are the ones, who command. It would be much more logical and safe to be a king. But Rowling likes symbolism, and everything in this chess game is symbolical. Ron IS a knight, because this redhead boy is pure in heart and brave as a real knight. He never was a king, or a commander."
Insert Maline: I agree with this. Ron is really the ideal Gryffindor, and in turn the ideal knight (see NT 20 for arguments on this). Even his hair is the Gryffindor colour (or almost) :-)
"Hermione is a castle, because castle walks straight, and Hermione is quite a "straight" person. Harry is a bishop because bishop is the figure that is very close to the King (Dumbledore). Harry is also not "straight" like Hermione, he prefers "to walk diagonally," because he's self-effacing and a little secretive (like confessors (bishop))."
Insert Maline: I'd rather compare the "walking diagonally" to Harry's disrespect for rules and willingness to cross some lines for a good cause, but sure…
"Then the game (WAR) begins...
"Their first real shock came when their other knight was taken. The white queen smashed him to the floor and dragged him off the board, where he lay quite still, facedown."
Bellatrix Lestrange murdered Sirius Black."
Insert Maline: this is an excellent point. Especially when you take a look at how much alike Ron and Sirius are. Both brave, both a bit reckless, Ron is Harry's best friend, Sirius is James' best friend, both tend to act without really thinking things over (contrast: Hermione and Lupin) and so on. From what we know of Sirius, he's definitely a knight, too (e.g. Hagrid: "he died in battle, an' tha's the way he'd've wanted ter go" OotP, p. 753), he fits the parallel perfectly. So does Bellatrix Lestrange as "the White Queen". In her trial (GoF), she is said to be sitting in her chair as if it were a throne, and there's definitely something regal in the way she is portrayed. Furthermore, she's the only prominent female Death Eater, and one who's totally loyal to Voldemort at that. If Voldemort is the white king (just think of his complexion), then surely Bellatrix is his queen. (Her husband is barely mentioned.)
"Every time one of their men was lost, the white pieces showed no mercy. Soon there was a huddle of limp black players slumped along the wall. Ron himself darted around the board, taking almost as many white pieces as they had lost black ones."
"The war plot of the sixth book. Aurors and Death Eaters are dying, many of them. Mrs Weasley wasn't being silly. Book 6 spoiler."
"Yes..." said Ron softly, "It's the only way... I've got to be taken."
"No!" Harry and Hermione shouted.
"That's chess!" snapped Ron. "You've got to make some sacrifices! I take one step forward and she'll take me -- that leaves you free to checkmate the king, Harry!"
"But --"
"Do you want to stop Snape or not?"
"Ron --"
"Look, if you don't hurry up, he'll already have the Stone!"
There was no alternative."
Ron sacrifices himself to let Harry kill Voldemort. There is NO alternative, he has to die anyway. The book 7 spoiler.
"He stepped forward, and the white queen pounced. She struck Ron hard across the head with her stone arm, and he crashed to the floor - Hermione screamed but stayed on her square - the white queen dragged Ron to one side. He looked as if he'd been knocked out."
Bellatrix Lestrange murders Ron Weasley.
"The white king took off his crown and threw it at Harry's feet. They had won. The chessmen parted and bowed, leaving the door ahead clear."
Harry kills Voldemort and survives. The Second Wizard War ends.
Here. ----------
At first I thought it was very farfetched, but after reading it again and fully understanding what it was referring to I thought it made alot of sense.