Save between wins. This quest is the only way to obtain all leader cards.
If you leave the vicinity of Passiflora the quest will fail. Do not start the quest If you are unsure of winning the gwent matches. You will not be able to go and get more cards If you already signed up for the tournament.
Sasha is the toughest opponent with her Nilfgaardian deck. She plays a very strong spy-themed deck which is also filled with high-strength unit cards and an entire roster of Nilfgaard and neutral heroes. Counter her with a lot of decoys and spy cards; keep the unit cards in the deck as close to 22 as possible and with the highest possible unit strength. The White Flame leader card is useful for countering her unique leader card which draws a unit card from the player's discard pile for her own use. It is HIGHLY RECOMMENDED players make a save if they wish to win the tournament outright, otherwise Sasha beats Tybalt in the final round. She can be romanced if Geralt agrees to her proposition.
Finneas will start a fist fight after he loses. He's not only a tough Gwent player, but also a tough fighter.
Geralt is hardly an ace gambler. He has had a few good runs in dice poker tournaments, true, but these were always local affairs against opponents whose skill level left much to be desired. A tournament in the world's greatest metropolis - now that was a horse of an entirely different color. The high entry fee and stringent deck requirements scared off amateurs, so only wealthy professionals had signed up. Everything was in place for play at a high level in exciting company - in other words, my friends, for pure pleasure.
It started with an indecent proposal. Sasha, one of the participants in the tournament, made Geralt a proposition so brazen even his jaded jaw dropped: together they were to steal the coin set aside as the tournament's prize.
Perhaps Geralt would even have been tempted by Sasha's proposition. Before he could accept or reject it, however, another double dealer made his presence known. While they were talking one of the participants stole the coin set aside for the reward, beating Sasha to the punch.
A halfling by the name of Bernard turned out to be the thief. This supposed farmer took the coin and hid with it in one of the city's warehouses. The witcher raced after him and defeated him in a final showdown.
As for Sasha, she turned out to be a Nilfgaardian agent known as Cantarella. Her cover blown, she had needed the coin so that she could skip town. As part of my duties as a chronicler I must note that before she left, she spent a night with the witcher, conducting various covert operations until the break of dawn.
If Geralt loses (or draws) to an opponent:
Yet Geralt did not manage to garner the tournament's grand prize. Such is life - you can't win them all, sadly. Geralt could only hope luck's cruelty at cards meant she would shower him with good fortune when it came to love.
The quest follows a somewhat different course if you refuse Sasha's scheme or lose a round at Gwent, but since those both lead to sub-par rewards, they should be discounted as less than ideal ways to complete this quest, and are not worthy of mention.