The HD method (short for the Higgs-Demars method, the names of the creators) is an intermediate 2x2 method that is similar in speed to CLL. The HD method has three steps:
1. Solving the V (solving 3/4 of an Ortega face on the d-layer). 2. LOLS (orienting the remaining 5 corners of the cube) 3. NLL (solving the rest of the cube in one algorithm)
The V is the first step of the HD method and by far the easiest. For this step you intuitively build 3/4 of a face on the d-layer. The V requires no algorithms and averages about 1.5 moves. The maximum number of moves for a V is 3. Here's 50 example V's sampled by Jonathan Lewis: (link)
LOLS (short for Lewis Orientation of the Last Slot) is the second step of the HD method and consists of 16 algorithms (plus the 7 well-known OLLs). The aim of this step is to have the u or d-layer color facing up on each piece. The algs for this step were created by Jonathan Lewis (also known as Shiv3r) and V. Higgs (also known as Thermex). The algsheet can be found here: (link) The average movecount for an LOLS algorithm is 5.5 moves and of the algs are under 5 moves.
NLL (short for Neuro Last Layers) is the last step of the HD method and requires the most algorithms of any step (36). The algorithms permute the V, place the DFR corner in its slot and permute the u-layer corner. Just like the LOLS step the unsolved d-layer corner should be held in the FR position. Most of the NLL algorithms were created by Neuro and can be learned here: (link)
1. The HD method contains a pretty reasonable number of algorithms, it only has a few more algorithms than CLL and way less than full EG. Plus, many of the algorithms are less than 5 moves, making them effortless to memorize.