Practical guides written under the same rule as every Zhai report: every claim tagged [Do this] (research-backed), [Worth trying] (cheap experiment), or [Tradition says] (heritage, no empirical support) — so you always know which kind of advice you're reading.
The 12 checks that matter at a viewing — road rush, lift-lobby doors, through-hall drafts, west sun, the number 4 — each one tagged, with the price effects separated from the physics.
Read the checklist →The Li-Fire shift without the hype: which facings benefit, why your Period 8 flat didn't go bad in February 2024, and the three "Period 9 upgrades" not worth paying for.
Read the guide →Why the same flat scores differently for different people: day master vs element profile, sheng and ke cycles, couples with conflicting charts — and what the match honestly can't do.
Read the guide →Want the applied version? The case-study set runs the same methodology over eight famous buildings — Marina Bay Sands to the Repulse Bay dragon gate. The full scoring canon is public at /methodology. And the S$39 quick check runs all of it on the unit you're about to commit to.