52. move: I also misread it. After 36.i2 I thought to play a forcing move in the top middle e.g. 37.l438.l539.f4 But I was afraid black's answer helps him later. And I had not enough patience to read all the variations of moves going up on the right side
If answered, helps the descending from p15.22.g21 23.i21 24.i20 25.j14 26.k15 27.l15 28.p18 29.q17 30.q20 31.o18 32.n19 33.m19 34.l20 35.k20
After 36.i2 I thought to play a forcing move in the top middle e.g. 37.l4 38.l5 39.f4 But I was afraid black's answer helps him later. And I had not enough patience to read all the variations of moves going up on the right side