Scoring: IMP
My table plays:
N [space]E [space]S [space]W [space] [space] [space] [space] [space]/ 1[di] / [space]1[sp] 2[cl] 4[di] 5[cl] 5[sp] / 6[di] / [space]/ [space]//
Open lead: ♥7
Result: +1
Another table plays:
N [space]E [space]S [space]W [space] [space] [space] [space] [space]/ 1[di] / [space]1[sp] / 2[di] / [space]4[sp] / 6[di] X [space]/ [space]/ //
Open lead:♥a
2nd trick lead:♣a
Result: -1
Conclusion:
Leading a non-trump A is good for defensing a large suit contract.

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