Problem 1689

1. Define the ellipse and points of intersection:
Let the ellipse be denoted by $\Gamma$. Let $X, Y, Z, W$ be the points where the two perpendicular lines passing through the focus $F$ intersect the ellipse $\Gamma$.

2. Define the intersections of tangents:
Let $A = XX \cap WW$, $B = XX \cap YY$, $C = YY \cap ZZ$, and $D = ZZ \cap WW$. These points are the intersections of the tangents to the ellipse at $X, Y, Z, W$.

3. Intersection of diagonals with the ellipse:
Let $AC$ intersect $\Gamma$ at points $I$ and $K$, with $I$ closer to $A$. Similarly, let $BD$ intersect $\Gamma$ at points $J$ and $L$, with $J$ closer to $B$.

4. Collinearity using Pascal's Theorem:
Let $T = XY \cap WZ$. By applying Pascal's Theorem to the hexagon $XXZWWY$, we get that $A, F, T$ are collinear. Similarly, applying Pascal's Theorem to $YYWZZX$, we get that $C, F, T$ are collinear. Thus, $T, A, I, F, K, C$ are collinear.

5. Perpendicularity of diagonals:
Similarly, $B, J, F, L, D$ are collinear. Since $F$ is the focus of the ellipse, we have $\angle BFA + \angle CFD = 90^\circ$. Given that $\angle BFA = \angle CFD$, it follows that $BD \perp CA$.

6. Tangency and harmonic division:
Since the pole of $T$ is $BD$, the lines $TJ$ and $TL$ are tangent to $\Gamma$. This implies that $(IK; JL) = -1$. Additionally, since $XZ \perp YW$, we also have $(XZ; YW) = -1$.

7. Collinearity of intersection points:
Denote $X' = II \cap JJ$, $Y' = JJ \cap KK$, $Z' = KK \cap LL$, and $W' = LL \cap II$. We observe that $X', X, F, Z, Z'$ and $W', W, F, Y, Y'$ are collinear.

8. Concurrent lines and harmonic division:
Since $LL, JJ, WZ$ are concurrent at $T$, we have:
$$-1 = (WZ; LJ) \overset{L}{=} (WZ; TLF \cap WZ) \overset{D}{=} (AC; TF)$$

9. Intersection points on the directrix:
Let $S = II \cap KK \cap XW \cap YZ$, $R = YY \cap WW \cap IL \cap JK$, and $P = XX \cap ZZ \cap IJ \cap KL$. We observe that $T, S, R, P$ lie on $AC, BD, X'Z', Y'W'$ respectively. Furthermore, we have:
$$-1 = (TF; IK) = (SF; JD) = (RF; XZ) = (PF; YW)$$
Thus, $T, S, R, P$ lie on the directrix of $\Gamma$ and are collinear.

10. Ellipse through intersection points:
Consider the ellipse passing through $AX'BCZ'$. Since $(AC; FT) = (X'Z'; FR) = -1$, the pole of $F$ is the directrix. Similarly, since $(BD; FS) = -1$, the points $AX'BCZ'D$ lie on an ellipse. Similarly, $ABY'CXW'$ lies on an ellipse. Since $F$ has the same pole in both cases, the points $AX'BY'CZ'DW'$ lie on an ellipse, denoted by $\Omega$.

11. Quadrilateral inscribed in a conic:
Consider the quadrilateral formed by the tangents from $A, B, C, D$ with $\Omega$. The vertex $A^* = AA \cap BB$ lies on the pole of $P$ and is collinear with $X, F, Z$. Similarly, $C^* = CC \cap DD$ lies on $X, F, Z$, and $B^* = BB \cap CC$ and $D^* = DD \cap AA$ are collinear with $F$ and $Y$ and $W$. This implies that $A^*C^* \perp B^*D^*$, so $\angle A^*FB^* + \angle C^*FD^* = 180^\circ$, and $F$ is the focus of some in-ellipse of $A^*B^*C^*D^*$, which must be $\Omega$. Thus, $\Omega$ has focus $F$.

$\blacksquare$