Looks like a normal castling move, preparing for G7h. Okazaki only saw the hidden meaning when it was already too late.

34.P4d-4e 35.S4f-5g 36.S4c-5d 37.P7f-7e!

(A diagram) This completely took Okazaki by surprise. He can not play 38.Px7e because of S8f followed by R7h. Suddenly white is in trouble. Okazaki should have defended the head of the knight with an earlier G6c.

38.S5d-6c 39.P7ex7d 40.S6cx7d 41.R2h-7h 42.P8c-8d 43.S7g-7f 44.G5b-6c 45.P*7e

This is a big pawn. Black's advantage is not yet decisive, but this attacking base is a nail in the knee.

46.S7d-8c 47.R7h-2h 48.B4b-3c 49.N8i-7g 50.P8d-8e!

(A diagram) Good fighting move. If white gets the chance to attack the pawn on 7e with S8d followed by P*7d, black will be in trouble.

51.N7gx8e

The only move, but this knight is in danger of being lost to a pawn drop on 8d.

52.N7c-6e 53.S5g-6h 54.P4e-4f 55.K8h-9h 56.P4fx4g+ 57.P6fx6e 58.R2b-4b 59.N*5e?

60.B3cx5e?

Two mistakes in succession. Okazaki had a chance to make things very complicated with 60.G5d P*4c R6b P2d Px2d S7g P*8d and white wins back the knight. Instead white opts for an all-out attack that is mistimed and gives Tanigawa the chance to display his brilliant endgame skills. Tanigawa could have forced Okazaki into the same variation as in the game if he would have played 59.P*4c instead of 59.N*5e. Then after 60.Rx4c N*5e white has to take the knight with the bishop: Bx5e. This leads to the same variation as in the game with an extra pawn in hand for white. Tanigawa thought he could do the same thing without giving up the pawn. Apparently, Okazaki agreed with him.

61.P5fx5e 62.+P4g-3h 63.R2h-2g 64.R4b-4i+ 65.G6i-7h 66.N*8d 67.P6ex6d 68.G6cx6d

69.B*7c!

Going straight for the king. If Tanigawa saw all that is to come, this is a brilliant endgame.

70.+R4i-6i 71.B7cx6d+ 72.+R6ix7h 73.G*8h 74.+R7h-6i 75.P7e-7d 76.N8dx7f 77.G6gx7f 78.P*7h 79.P7d-7c+ 80.P7hx7i+

(A diagram) Suddenly it seems that Tanigawa has made a mistake. He has no mate, while black now is threatening mate (S*8i Gx8i +R7h Gx7h B*8i).

81.+B6dx5c 82.K7a-8a 83.S6hx7i!

This is the only defence. 84.+Rx7i is no longer threatening mate, so black can win with 85.+Px8c Sx8c N*7c.

84.B*4e!

(A diagram) Good last try. This bishop both attacks (it again threatens mate with S*8i) and also defends.

85.R2g-7g!

The final blow. White's attack is over.

86.P*7h

Virtual resignation as this is not threatening mate. However, a move like 86.G*6h fails to P9f so there is nothing white can do.

87.+P7cx8c 88.S7bx8c 89.N*7c 90.K8a-9b 91.N7cx6a+ 92.P7hx7i+ 93.G*8b

Resigns
Time: 02:46:00 02:57:00

With some fireworks in the endgame, Tanigawa also wins the second game of the Zen Nihon Pro Tournament and now only needs one game out of three to win his seventh title. Okazaki seems to play his best shogi with his back against the wall and he will need that to keep this match going.