Possible Clues:

• Study applicable to many sciences
• Analysis of strategies in terms gains and losses in competitive situations
• Mathematical approach to military strategy, say
• A variation on theme in gruesome branch of mathematics
• Bloody outstanding article by a setter for analysis in competition
• Branch of math
• Transformed a geometry that includes hard part of mathematics
• Speculation after 10 across leads to study of strategic decision-making
• Speculation after match leads to analysis of competitive decision-making
• John Nash's field of mathematics