I agree with steve, i think its best to list the components you are planning, the antec solo II is not a bad choice but has some drawbacks, specially for X99, since most of those motherboards have the first PCIe in the first lane.... depending on the GPU length... it might not fit with the hdd cage in front.
Some other cases to look into,Obsidian Series® 550D Mid-Tower Quiet Case
- Dimensions: 20.9” x 8.7” x 19.5”, the width would be around 22cm, so fits what you are looking. No mention on EATX mobos.Carbide Series® 330R Quiet Mid-Tower Case
- Dimensions 495mm x 210mm x 484mm, "Compatibility E-ATX, ATX, Micro ATX and Mini ATX motherboards".Coolermaster Silencio 550
Dimensions 210 x 451.5 x 505.0 mm, but no EATX support stated.Nanoxia NXDS2W White Steel ATX Mid Tower Deep Silence 2 Gaming Computer Case
- Dimensions 21.75" x 12.00" x 26.50" (H x W x D), Compatibility Micro ATX / ATX / Mini ITX / E-ATX.Nanoxia NXDS1B Black Steel / Plastic ATX Mid Tower Computer Case
- Dimensions Approx. 8.66" x 20.35" x 20.94", around 22cm width. No mention on E ATX, Compatibility ATX, XL-ATX, Micro-ATX, Mini-ITX.
The only one that fits your 23cm width and 50cm height, and has stated EATX support is the Corsair 330R.