The Major's format is a hydraulic system that reshapes map pool value. In the Swiss stage, maps are allocated as limited resources, while in the playoffs, the second map becomes the real decider. This article uncovers the hidden dynamics and the crucial details players keep off the record.
The Major's format has never been just about seeding—it's a hydraulic system that inversely shapes map pool value. The Swiss stage mixes BO1 and BO3, while the playoffs are all BO3. The weight of maps in these two phases is completely different. Most viewers focus on what teams ban, but what truly decides a series is often the "default ownership" of the second map.
The Swiss Map Pool is a Funnel, Not a Ladder
In the Swiss stage, teams often play maps in the first two rounds that aren't their strongest, but rather the ones "least likely to cause an upset." The reason is simple: the variance of a BO1 can swallow even the most careful preparation. So you'll see a counterintuitive phenomenon—some teams deliberately drop their highest win-rate map at 0-0, saving it for the do-or-die 2-2 round. This isn't conservatism; it's treating maps as a finite resource to be allocated.
Prep notes usually have a page like this: for each map, three numbers—your first-kill conversion rate, the opponent's default round win rate, and the win rate after the first timeout. The third number is the most overlooked, yet it's the most valuable in the Swiss stage. Because the timeout rhythm is fragmented by the format, whoever can execute a clean opening after a timeout gains the psychological edge for the next map.
In the current map pool, Ancient and Nuke act as "sieves" in the Swiss stage: they demand extreme discipline in default rounds, and any wasted utility gets magnified into a lost half. Mirage and Inferno are more like "cushions," allowing teams to rely on individual skill. So you'll see the same team repeatedly play Mirage in the Swiss stage, then suddenly elevate Ancient to first priority in the playoffs—not because the map changed, but because the need for error tolerance changed.
Playoff BO3: The Second Map is the Real Decider
The math of a BO3 is brutal. After the first map, both teams' preferences are fully exposed on the opponent's notebook. The true masters often complete their preparation for the second map before the first map even starts.
There's a rarely discussed hidden line: in the playoffs, teams usually prepare less for the third map than for the second. Because most coaching staffs bet on "winning one of the first two," making the third map an improvisational battle. Thus, the choice of the second map becomes a double game—you not only pick what you can play, but also pick the opposite of what the opponent expects you to pick.
The unwritten page in prep books often records the opponent's "map pool inertia": if a team loses the first map, there's over a 60% chance they'll return to their most familiar map for the second. This inertia can be exploited. You don't need to be stronger than your opponent; you just need to set up a default-round variation on their inertial path.
Players' Prep Books: Entries Beyond the Map Pool
What truly determines Major results is often not the map pool itself, but entries in players' prep books that seem unrelated to maps. For example: the difference in your AWPer's first-shot accuracy on a specific map between night and day sessions; the impact of specific spawn positions on first-kill rhythm; and the most underestimated—how to play the first three rounds after switching sides.
The first three rounds after switching sides are the window with the least information and the densest decisions. In the Swiss stage, this window is short; in the playoffs, it's long. Well-prepared teams will have two completely different defaults here: one against the opponent's force-buy, one against their half-buy. The difference between these two defaults is often just which of the three smokes lands first.
The Major's format won't tell you this. The map pool won't either. They just lay these questions on the table, waiting to see whose prep book has turned to that page. On C5GAME you can buy a skin for any gun, but you can't buy that page of notes—that page can only be earned with lost rounds.