B has Ks-Qs call 16k (Pot 50k)
Because B has position over A (and because his K-Q is suited) B can afford a call. In the meantime A plays his pocket A’s like any other raising the hand in middle position to confuse B. If A only called his Aces it could make B think he has A-A and result in B calling or folding later should A give away more strength signals.
The Flop: 7s-2d-Qh
A bets 23k
B calls 23k (Pot 96k)
A’s gets are based mainly on the pure value of the Aces rather than the possible value of B’s hand. His Aces are most likely secure now due to 3 undercards falling and the probable pairing of the Queen with a caller in late position, that is just so long as no face card falls later on as that could result in a paired kicker to the one holding a Queen. B also believes that his Queens have value, but not strong enough if a King or Ace falls – he may put A on a bluff with A-x or K-x – so he just calls.
The Turn: 7s-2d-Qh-8d
Now A bets with 55k
B responds by calling with 55k making the pot 206k
A does again what he did on the Flop, and thinks likewise. B also thinks likewise. As there are no draws on the Flop (both may think a backdoor Flush unlikely) and his Aces still all undercarded A keeps on hammering B aggressively and B stays hammered in passive mode.
A bets 121k (Pot 372k)
This bet forces B all in. Because all cards are undercards to A’s Aces, and all other board cards are undercards to B’s Queens, A thinks B now has a Queen which he may be willing to be suicidal with. So A keep the aggression going where a lot of players might slow down given that the Aces are only just a pair and so may check to stay safer or check-raise if they feel their Aces are decent, A however pushes B all the way to all in.
B still thinks his Queens are strong enough which is why he has come as far as the river. Then he does the orthodox maneuver. Could it be that he is up against A-Q? Not likely, so
B moves all in on 121k
A aggressively hammered at B all the way from preflop to the post river all in death and B just kept accepting the hammering. A did not give B a chance to react gracefully. B played passive in response to the aggression and called all the way to his all in destruction.
It could be that B sensed As unusual strength since he just called all the time. But if so he should have trusted his senses once the river was reached and bowed out. The bets at Flop and Turn bets might offer cheap call spots and even if he thinks he is beaten then he can still draw, but by the river stage bet is not cheap and is enough to finish him off.
As you can see there are a lot of factors involved in this hand, the same goes for most poker hands. One point to be clear on is that there isn’t a right and wrong way, you should not play aggressive or passive all the time, in order to be great at poker you have to be able to play both ways and all the ways in between and adapt as you go along.