Movie of Tachi Shomen Uchi Tsuki.
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The critical thing here is the timing. Tachi Shomen is a two count strike. Uke raises the Boken on the 1st count and strikes on the 2nd count. Nage finishes the Tachi Tsuki on the 1st count as Uke's Boken reaches its highest point. This is ideal Aikido timing. This is a basic Japanese sword exercise. It is very common and not unique to Aikido. It is extremely economical because it ends the interaction in one count.