javascriptのifの省略方法についてが分かりません

現状

javascript
1const board_preference = {0: "＋", 1: "○", 2: "●", 3: "■", 4: "＋"};
2let board = 
3[[0,0,0,0,0,0,0,0],
4[0,0,0,0,0,0,0,0],
5[0,0,0,4,3,0,0,0],
6[0,0,4,1,2,3,0,0],
7[0,0,3,2,1,4,0,0],
8[0,0,0,3,4,0,0,0],
9[0,0,0,0,0,0,0,0],
10[0,0,0,0,0,0,0,0]];
11
12const user_turn = (user_selection_vertical, user_selection_horizontal) => {
13	let user_x = user_selection_vertical;
14	let user_y = user_selection_horizontal;
15	if (board[user_x + 1][user_y] == 1,board[user_x - 1][user_y] == 1,board[user_x][user_y + 1] == 1,board[user_x][user_y - 1] == 1,board[user_x + 1][user_y + 1] == 1,board[user_x - 1][user_y + 1] == 1,board[user_x + 1][user_y - 1] == 1,board[user_x - 1][user_y - 1] == 1||
16		board[user_x][user_y] == 1||
17		board[user_x][user_y] == 2||
18		!board[user_x + 2][user_y] == 1,!board[user_x - 2][user_y] == 1,!board[user_x][user_y + 2] == 1,!board[user_x][user_y - 2] == 1,!board[user_x + 2][user_y + 2] == 1,!board[user_x - 2][user_y - 2] == 1,!board[user_x + 2][user_y - 2] == 1,!board[user_x - 2][user_y + 2] == 1
19　　　　　　　　　　　　　　・
20　　　　　　　　　　　　　　・
21　　　　　　　　　　　　　　・
22) {
23		return;
24	}
25	board[user_selection_vertical][user_selection_horizontal] = 1;
26}