After taking a B&W workshop, where the instructor told of a method I had not read of before: where you use a very high concentration of developer for the first 2min or so then switch to a very diluted version of the sme developer to finnish off developement. He claimed that it controlled highlights very well but still produced very well separated shadows and mid-tones. So I tried it. I had a subject that measured EV8 to EV16.5 I placed EV8 on zoneIII and gave an extra stop of exposure. I developed the film(foma 200) in straight D-23 for 2min with 45 sec constant agitation at the begining and 15sec/min after. I then transfered it to a water bath and diluted my straight D-23 to 3:1 and continued developement for another 9min(45sec constant agitation at the start and 15sec/min after) it came out beautifully. I did not have to do any dodging at all to print the negative the shadows are well separated and the entire print has excellent contrast throughtout, the highest whites are right at zone 8 with excellent detail. thought I'd pass this along since it worked so well for me.