Around 1920 there was a Soviet study of chess masters that revealed 16 skills and strengths that the master possessed to a high degree:

1) A good reserve of physical strength and good general health
2) Strong nerves
3) Self-control
4) Ability to distribute attention over many factors
5) Ability to perceive dynamic relationships
6) A contemplative turn of mind
7) A high level of intellectual development
8) Ability to think objectively
9) Ability to think concretely
10) A powerful memory for chess matters
11) Powers of synthetical thought and imagination
12) Conbinative ability
13) A disciplined will
14) A highly active intellect
15) Disciplined emotions
16) Self-confidence

This list from Garry Kasparov's Child of Change

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