White had one more chance, though. The problem with |13.i7 is the lack of supporting material in the upper right after 14.j4. It might seem counterintuitive, but |13.j8 works. Now if 14.j4, White has room to go around it with 15.m5. And if Black doesn't link, for example, then 14.m515.h4.
White had one more chance, though. The problem with |13.i7 is the lack of supporting material in the upper right after 14.j4. It might seem counterintuitive, but |13.j8 works. Now if 14.j4, White has room to go around it with 15.m5. And if Black doesn't link, for example, then 14.m5 15.h4.
Also not immediately obvious, the upper left does not work because Black's h16 peg catches the retrograde ladder chase: |13.d6 14.e8 15.e9 16.f10 17.d7 18.f6 19.f11 20.g12 21.g13 22.h14 23.f15 24.f19
11.j8 12.k7 13.h9 14.i6 15.e6
Or
|11.j8 12.i7 13.k10 14.k6 15.n7 16.m7 17.m9 18.o6 19.p6 20.q5 21.r5 22.s4 23.t4