Curate, connect, and discover
I had a little thought on game of thrones and how Tywin could have won the Game.
A. After the Battle of Blackwater instead of punishing Tyrion with a wedding with Sansa, he should have offer him a wedding with Margeary.
1) Tyrion punishment would have been the same because it was the wedding itself that he loathe
2) Margeary would have been a wonderful ally to Tyrion, just imagine one sec the power of Margeary/Tyrion/Olenna together !
3) The alliance between the Lannister and Tyrell would have been preserved, with a slight insult to the Tyrell
B. Tywin should have betrothed Sansa
1) She is a valuable hostage, it is necessary to keep her out of Joffrey's games and painful actions and what better protection than to be Tywin's future wife ?
2) He could have use a false medical pretext to not touch her until she reach 16 or 17 and by that time the war would be over.
3) He could have order Cersei to find a suitable wife for Joffrey, which would have the benefit to give her an occupation and a distraction
With all that, you have Sansa under protection, a durable alliance with the Tyrell, with the possibility of a new generation by Tyrion an Margeary, Cersei occupied to find a wife for her first born and no Purple Wedding ! So no trial for Tyrion, no Tyrion killing his father ! Tywin stay to rule and avoid all of Cersei stupid decisions !
What do you think ?