The Major format, map pool and player prep notes look like three separate documents from the outside. Inside a pro team they are one gear train: the format sets the map pool's weight, the map pool sets the thickness of the prep notes, and the notes expose the cracks in the format that most people miss.
Most viewers treat the Major format, the map pool and player prep notes as three unrelated files: one explains how you advance, one lists which maps you play, one records a player's personal habits. Inside a pro team these three are the same gear train. The format decides how much weight each map carries. The map pool decides how thick the prep notes get. And the notes, in turn, expose the cracks in the format that are easy to overlook.
Angle 1: Swiss-stage map fatigue is not superstition
The most underrated thing about the Swiss stage is how it drains the map pool. In BO1 rounds a strong team usually locks a point on its default comfort map, but that also means the same map can be exposed repeatedly over three days. The opponent's analyst will break down your default utility lines frame by frame. By round four, your comfort map has become a public question bank.
In a real prep notebook, the key question in the Swiss stage is not which map we play but when we switch maps. A common approach: in at least one of the first three rounds, actively pick a map where you win around 55% in scrims but the opponent has a thin sample on it, trade the information gap for a point, and save the real kill shot for the playoffs. That is not hiding your hand; it is resource management forced by the format.
Angle 2: The three-and-a-half map logic
The Major map pool is never seven maps split evenly. A pro team's actual prep pool is usually three and a half: three main maps plus half a wildcard map. The main maps must cover the pick order in a BO3; the wildcard is used only against a specific opponent or at a specific score point.
The deeper logic of the map pool lies in veto order. Many teams put their strongest map second, because the first pick is often banned away and the second is what you actually get. The prep notes will state explicitly: against Team A, what we ban first; against Team B, what we pick second. These notes are not gut feeling. They are reverse-engineered from the opponent's veto record over the last twenty official matches.
Angle 3: The three-layer structure of prep notes
A player's prep notes usually have three layers. The first is the default utility line, precise to the second and the position. The second is opponent habits, such as which round an opposing AWPer likes to push on CT side. The third is live variables, such as the opponent's economy tendency at 9-9.
Of the three, the layer outsiders overlook most is the third. Live variables are not data; they are experience. A veteran will write in his notes: against Team X, if they lose three rounds in a row, they will likely force-buy next round, because their IGL dislikes half-buys. That judgment cannot be read directly from a demo, but it is the most valuable part of the prep notes.
Angle 4: How the format silently prices mentality
The Swiss stage mixes BO1 and BO3, and the effect on player mentality is subtle. Losing a BO1 is not fatal, but it disrupts the exposure rhythm of the map pool. Losing a BO3 drops you straight into the lower bracket, and the pressure is completely different. The prep notes will contain a mentality anchor: for example, do not call the wildcard map early when behind in a BO1; save it for the BO3.
Such anchors are not motivational fluff; they are dictated by the structure of the format. The Major schedule is dense, and a player's attention is a limited resource. Spending the wildcard map in a desperate BO1 is the same as showing your hole card to the next opponent. Coaching staffs write this into the notes before the event to remind players: the format is not a backdrop. It is part of your tactical decision-making.
In short, the Major format, the map pool and the prep notes form a closed loop. Those who understand the format know how the map pool is allocated; those who understand the map pool know how the notes are written; and only those who understand the notes can predict that map switch half a second early while watching. This is not superstition. It is the homework pro teams do every day.