Well, it is 4 panels. Going from Left to right here's what's on it.
Panel 1:
Weapons (PHB and FRCS combined) Damage, critical, range increment.
Panel 2:
Fundamental Actions in Combat: Action, move yes/no, AoO yes/no
Attack Roll Modifiers:. (attacker on higher ground +1 melee, +0 ranged, etc.)
Partial Actions.
Cover:. 1/4, 1/2, 3/4, etc. examples, AC bonus, Reflex bonus.
Concealment: examples, Miss chance.
Panel 3:
Miscellaneous actions: Free Actions, Move Eqv, Standard, Full Round. AoO yes/no.
Armor: type, Max dex, Check penalty, Spell fail, speed. <no wt.>
The Roll of years: 1360 year of the Turret - to - 1380 year of the Blazing Hand <useless IMO, and I run FR>
Panel 4:
Size and AC of Objects: Colossal thru Fine, example, AC mod.
Substance Hardness & Hit points
Common Weapon & Shield Hardness and Hit points.
DC's to break or burst items.
Object Hardness & Hit points.
Terrain & overland movement in Faerun: Terrain type, Road, Trail, and trackless rates.
Turning Undead.
Calendar of Harptos.
Light Sources.
I like it. But no DM screen is going to please any DM 100%. The art work is just like the cover art from Magic of Faerun and Lords Of Darkness. The booklet of encounter charts is cool.