Errors specific to indoor 4v4 (university intramurals, FFVb / Volleyball Canada doctrine, beach 4s).
1. Isolated blocker with no tip coverage : The 3 defenders all go deep, leaving the 3-5 m zone empty. Someone has to always be assigned to the tip at 3.5-4 m from the net.
2. 2 defenders in a straight line : Side by side at the same depth → the cut shot drops between them. In 4v4, defenders must always be staggered (one close, one far) or spread laterally.
3. The setter running to set before the ball is defended : Premature transition leaves a defensive hole. The setter waits for confirmation that the ball is up before leaving for the target.
4. No signal between blocker and defenders : The blocker MUST call "line" or "cross" before the attack starts. Otherwise, the 3 defenders don't know what to cover — everyone improvises.
5. Tip defender too far from the net : They back up with the other back-row players and can no longer cover short tips. Their position is 3.5-4 m from the net, in the axis — not 7 m.
6. "Random" block by the wrong player : In 4v4, blocking with a poorly placed player (far from the hitter) leaves the opponent facing 3 misaligned defenders. The blocker has to be the one in front of the main hitter.
7. Faulty reading : With ~40 m² per defender (vs 20 m² in 6v6), a reading error is unrecoverable. Anticipation = skill #1 in 4v4.