Major preparation isn't just about practicing seven maps. The BO1 draw and veto order in the first two rounds of the Swiss stage often determine how far a team can go—turning map pool depth into a probability problem, and players' prep notes into a bet on that distribution.
Introduction
Major preparation is never as simple as "practice seven maps." What truly determines how far a team can go is often the BO1 draw and veto order in the first two rounds of the Swiss stage—it turns map pool depth into a probability problem, and players' prep notes are essentially a bet on that distribution.
1. BO1 Veto is a Compressor, Not a Sieve
Many people understand BO1 ban/pick as "whoever has the deeper map pool wins." Actually, it's the opposite: in BO1, veto is more like a compressor, squeezing seven maps into one, and the compression process systematically favors teams with a "flat" map pool rather than a "spiky" one.
Look at the order. BO1 veto is usually ban-ban-ban-ban-ban-ban, leaving the last map. The first two bans are each side's most disliked maps, providing almost no information. The real game starts with the third and fourth bans: by then, both sides know the opponent's first two bans and begin to "protect their strong maps + ban the opponent's possible strong maps." By the fifth and sixth bans, among the remaining two maps, there is often one that neither side has systematically practiced.
This is the key: the final map in BO1 is often not a strong map for either side, but a neutral map that is "not weak for either, but not a main practice map for either." Thus, teams with a "spiky" map pool (only two or three playable maps) get diluted in BO1—their strong maps are likely banned by the opponent in the first four bans, forcing them to play a map they usually only keep as a backup.
The implication for preparation is direct: in the two weeks before the Major, instead of practicing three strong maps to 95 points, it's better to raise the fifth and sixth maps from 60 to 75 points. A 75-point neutral map has a much higher expected return in BO1 than a 95-point strong map—because the strong map never lands.
2. The Swiss Opponent Pool Determines Which Half of the Map Pool You Practice
The Swiss stage is record-based pairing, not random pairing. This means your opponents in the second and third rounds are strongly correlated with your first-round result. The first line in your prep notes should not be "the opponent loves Mirage," but "in my record bracket, which maps will the opponent pool concentrate on?"
For example, a structural observation: in the 0-0 bracket, team map pool distribution is most dispersed, any map could land; in the 1-0 bracket, teams that win BO1 often have a "flat" map pool, and veto tends to favor neutral maps; the 0-1 bracket is the most dangerous because teams with their backs against the wall will force the game into their strong maps, with maximum veto aggression, making extreme "one map decides all" outcomes more likely in BO1.
So "which half of the map pool to practice" has an answer: if you expect to go the 1-0 route, focus on neutral maps and CT-side defaults; if you expect to fall to 0-1, focus on "anti-targeting"—when the opponent forces their strong map, do you have a T-side explosive script that can break the default? The training content of these two prep sheets hardly overlaps.
3. Three Things Players Actually Note Down
A pro player's prep notes are not like a commentary script. They usually have only three parts:
- Opponent's default rhythm: Not "they love hitting A," but "in the first 20 seconds on T-side, they usually do only two things: control mid + throw a detection flash." Record the rhythm, not the positions.
- Your own veto red lines: Which map must never be given to a specific opponent, written in stone. The fewer red-line maps, the more flexible the veto.
- Economy round buy preferences: Whether the opponent forces or ecos in a 2v2 economy round directly determines how aggressive your default positions should be next round. This is the most easily overlooked yet most influential factor in BO1 outcomes.
Conclusion
The Major Swiss stage, on the surface, is about aim and improvisation, but underneath it's a game of veto order and map pool distribution. Dividing your prep sheet by "expected record bracket" is closer to the true probability of winning BO1 than uniformly practicing seven maps. Practicing maps isn't about quantity; it's about practicing the map most likely to land in the opponent pool.