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X(3), X(6), X(25), X(1413), X(7074), X(15905), X(41489)

green points : isogonal conjugates of X(6616), X(64986), X(66090), X(66091), now X(71179), X(71180), X(71181), X(71182) in ETC

vertices of the cevian triangles A1B1C1 and A2B2C2 of X(3) and X(15905)

extraversions of the weak points X(1413), X(7074)

(See Ivan Pavlov, Euclid #9201 and K004, property 30)

Q191 is the isogonal transform of Q189. It is invariant under the isoconjugation with pole X(32).

Q191 is circum-sextic with double points A, B, C whose nodal tangents are the cevian lines of X(25) and X(41489).

K is a quadruple point with tangents passing through X(41) and extraversions.