if (!data['refutation_lines'] ||
!data['refutation_lines'][nonstupid_moves[i]] ||
!data['refutation_lines'][nonstupid_moves[i]]['pv'] ||
- data['refutation_lines'][nonstupid_moves[i]]['pv'].length < 1) {
+ data['refutation_lines'][nonstupid_moves[i]]['pv'].length < 2) {
// Incomplete PV, abort.
response = undefined;
break;