Why did I lose this

I thought I was winning then the computer got a huge attack against me out of nowhere.

開始日時：2022/07/10 20:30:11
終了日時：2022/07/10 21:01:19
棋戦：Casual Classical game
場所：lishogi.org/UIC4egYb
持ち時間：20分+180秒+20秒
手合割：平手
先手：lishogi AI level 3
後手：Not-Asian
手数----指手---------消費時間--
1 ７六歩(77)
2 ３四歩(33)
3 ６六歩(67)
4 ４二銀(31)
5 ７八金(69)
6 ４四歩(43)
7 ６八銀(79)
8 ４三銀(42)
9 ６九玉(59)
10 ３二金(41)
11 ７七角(88)
12 ４一玉(51)
13 １六歩(17)
14 ６二銀(71)
15 ２六歩(27)
16 ７四歩(73)
17 ５八金(49)
18 ７三銀(62)
19 ６七銀(68)
20 ５二金(61)
21 ２五歩(26)
22 ３三角(22)
23 １五歩(16)
24 ８四歩(83)
25 ４八銀(39)
26 ５四歩(53)
27 ４六歩(47)
28 ５三金(52)
29 ５六歩(57)
30 ９四歩(93)
31 ４七銀(48)
32 ８五歩(84)
33 ６八角(77)
34 ８四銀(73)
35 ３六銀(47)
36 ９五銀(84)
37 ９六歩(97)
38 ８四銀(95)
39 ７九玉(69)
40 ７三桂(81)
41 ７七桂(89)
42 ４二角(33)
43 ６九玉(79)
44 ５二金(53)
45 ５七角(68)
46 ９五歩(94)
47 ４五歩(46)
48 ９六歩(95)
49 ２四歩(25)
50 同　歩(23)
51 ５五歩(56)
52 ３三金(32)
53 １七桂(29)
54 ９七歩成(96)
55 ５四歩(55)
56 同　銀(43)
57 ２二歩打
58 ３二玉(41)
59 ２一歩成(22)
60 同　玉(32)
61 １四歩(15)
62 同　歩(13)
63 ５六銀(67)
64 ４三金(52)
65 ５五桂打
66 ５三金(43)
67 ５九玉(69)
68 ９八歩打
69 ６五桂(77)
70 ６四金(53)
71 ４六角(57)
72 ６五桂(73)
73 同　歩(66)
74 同　銀(54)
75 同　銀(56)
76 同　金(64)
77 ４三銀打
78 ６四角(42)
79 ２四角(46)
80 同　金(33)
81 同　飛(28)
82 ２二歩打
83 ２五桂(17)
84 ４一桂打
85 ３三桂打
86 同　桂(41)
87 同　桂(25)
88 １二玉(21)
89 １三歩打
90 同　玉(12)
91 １四香(19)
92 ２四玉(13)
93 ２五金打
94 ３三玉(24)
95 ３四金(25)
96 詰み

It's a checkmate. You have no where to move your king. Works just like it does in chess.

I think OP means "what went wrong? How could I have prevented this outcome?"

A question that I'm not really equipped to answer in any amount of depth, but based on computer analysis: When you moved your bishop on move 78 to 64, your king went from slightly vulnerable to very vulnerable. From there it was just a matter of time. (At our level, anyways.)

2

you missed your chance to break through using the most elementary tesuji of bougin- as in you missed the one purpose of the exact attack you were making. i would recommend to review the tesuji often used by bougin and stop focusing on material.

1