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RufzXP is an excellent training software for improving code speed and CW practice, particularly (ultra) high speed memory copying of true amateur radio calls.
Focussing on improvement of CW proficiency, it is no contest simulator and does not provide for QRM. It provides additional tools for keeping track of training progress and comparing with other operators via International RufzXP Toplist.
RufzXP is a "must" for every serious high speed telegraphy operator and is an official competition of IARU High Speed Telegraphy Championships.