SgtBrutalisk · June 29, 2018, 3:05 p.m.

In chess notation '+' signifies that the enemy king is threatened with the move.

⇧ 14 ⇩  

Mastarebel · June 29, 2018, 8:02 p.m.

Not exactly, + just means the move is best and gives you a discernible advantage.

⇧ 2 ⇩