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16.j20 17.r17 18.r21 19.r19 20.s19 21.t18 22.q19 23.u20
If you are referring to one of Alan's variations instead, please say so, or better still, list all the moves that differ from the actual game in your post. Thanks.
16.k21 17.r17 18.r20 19.e18 20.f15 21.d14 22.e14 ?
16.k21 17.r17 18.r20 19.e18 20.e20 ... then maybe 21.k23 22.q18 23.i20 24.j20 25.g19 26.d18? I still don't see a way for white to win.
16.k21 17.r17 18.r20 19.e18 20.e20 21.h20 22.j20 23.g18 24.g17 25.e16 Could that work?
16.k21 17.r17 18.r20 19.e18 20.f15 21.d14 22.e14 23.f13 24.c15 25.d16 26.d17 27.f17 28.e20 29.h20 30.j20 31.f19
16.k21 17.r17 18.r20 19.e18 20.e20 21.h20 22.j20 23.g18 24.g19 25.e19 26.???
As for Twixter's second line, I question move 24:
16.k21 17.r17 18.r20 19.e18 20.f15 21.d14 22.e14 23.f13 24.d16 25.c17 26.b17 27.???
16.k21 17.r17 18.r20 19.e18 20.e20 21.h20 22.j20 23.g18 24.g17 25.e16 26.d16 27.c15 28.f17 29.d17 30.d18 31.f16 32.f15 33.f14 34.e17 35.c19 36.c21 and Black wins after all?
16.k21 17.r17 18.r20 19.e18 20.e20 21.h20 22.j20 23.g18 24.g19 25.e19 26.d18 27.g22 28.h16 29.d16 30.g14 31.d11 32.d13 33.e14 two branches:
34.e11 35.g13 OR
34.f12 35.c13 36.e9 37.e8 38.f7 39.d10 40.e5 41.f9 42.g9 43.h10 and in neither case am I certain who wins.
Alan's line: This looks like a win for white under standard rules and a loss under PP rules. With standard rules, after
16.k21 17.r17 18.r20 19.e18 20.e20 21.h20 22.j20 23.g18 24.g17 25.e16 26.d16 27.c15 28.f17 29.f16 30.f15 31.d13 32.e17 black would have to remove D16/F17 and then after
33.c19 White appears to be winning. But of course this was a PP game.
In view of all this, I back up and try something else:
16.k21 17.r17 18.r20 19.h20 20.j20 21.e17