The basic aikido tanto techniques are called tanto-dori. These techniques are coming from the old period of Japan when i battle you have too defend against armored foot soldiers. The only way too critically hit a armored footsoldier is to strike at weak points in their armor called Bogu. Aikido have applied techniques with tanto too that are made for realistic combat AGAINST a attacker.
@filippxxx It is true that the attacks are stylized, but that is for practice and demonstration purposes. However, it is inaccurate to say that these defenses will not work against a real attack. Many of them will. I know people who have done things similar to what you see here against real knife attacks and come away uncut.