In the first game the player with Ancestral passed the turn with 8 cards in hand. I suppose Ancestral was played during the opponent upkeep.

In the last game IMHO the Oath player should have played Misdirection on Thoughtseize, even if the opponent was empty-handed. This way he could protect his turn 2 oath wich is far better than turn 2 impulse.
Also, I found a little strange not playing 'Seize before Vault for the Tezz player.
I also noticed that you never never never lead with duress if you have something else to do on turn 1 play. Protecting your bomb isn't worth spending turn 1 duressing? I'd like to ear your thoughts on this.
Oh, btw, good article

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In G1, that was a main-phase Ancestral Recall. When I wrote up the recap, I just missed writing that Oath played the Mox Ruby and Pearl.
Someone made the some point re: the Misdirection in G8, and that is definitely the correct play. I was playing Tezz in these games, and I felt like leading with the Vault was correct. My instinct is that with my hand being so low in cards, my opponent would not FoW the Vault, preferring to save it for whatever I used to try and find Key or Tezz. That said, there's no reason not to MisD the TS to protect the Oath.
Re: T1 Duress/TS, which deck are you referring to, or just in general? This was an intersting question, so I went back and took a look...
G1, I assume Oath wanted to resolve Ancestral with FoW back-up rather than play Duress or TS. If the Ancestral resolves, he's way ahead. If it gets Forced and I FoW back, he's still ahead.
G2 as Tezz, playing the Recall on his upkeep is a way of protecting my "bomb" in a way, since IMO that's the best card in my hand. Time Vault can always be put back into play with Yawg Will.
G3, Oath does have the choice of Orchard, Duress, pass turn. However, I'd probably make the same play and just "go for it", seeing as there were multiple Impulses involved. Some of this might've been a read - but the other question involved with Tezz is actually the difficulty in "protecting" Oath. If you duress and see FoW and a Duress/TS, you're losing the Oath no matter what.
G4, I lead with Duress.
G5, Oath leads with Thoughtseize. However, there is a misplay here. Oath should've played its land, then jet, then TS. That way if it gets Misdirected, Oath can Recall in response. Granted, this Tezz list has no Misdirection, but many do. Better to get in the right habit, assuming you prefer this line of play (since it gives you more options to choose a card to discard to your own TS).
G6, Tezzeret is on the play w/out TS or Duress. Oath also has neither.
G7, Oath has a T1 Oath with FoW back-up.
G8, Tezz has no TS/Duress.